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Analysis Methods and Verification

What analysis methods do you include in DeepEX software?

DeepEX basic version includes the conventional Limit Equilibrium Method, Non-linear Analysis method (with use of elastoplastic Winkler springs) and a combined method (LEM+NL)

Limit Equilibrium Method

Walls are analyzed with limit equilibrium method. Supports are fixed and each stage is independent. Thus, wall deflections (and likely wall bending moments) are not realistic for cases with multiple supports.

 

Non-Linear Elastoplastic Analysis

Walls are analyzed with an elastoplastic analysis approach (Winkler springs on active and passive sides). Initial stage is geostatic with no excavation. Displacements, wall bending moments, etc. depend on construction staging, soil and support elasticity.

 

Combination Method (LEM+NL)

Walls are analyzed first with limit-equilibrium approach and wall embedment safety factors are stored. Then an elastoplastic analysis is performed and all other results (wall moments, deflections, shear force diagrams, support reactions etc) are produced.

Which analysis method should I use?

We usually perform all types of analysis and consider the most critical results.

  • Conventional Limit Equilibrium Analysis Method is usually required.
  • Non-linear Analysis Method results are usually more realistic, especially in multi-level excavation projects, since the construction staging is taken into consideration.
  • Finite Element Method is considered to produce very accurate results. It can analyze conditions that consider full soil-structure interaction.

Is DeepEX a Finite Element analysis software?

DeepEX introduces a new additional module, the Finite Element Analysis. The new module enables users to analyze conditions, that consider full soil-structure-interaction. Elasticty models include Linear elastoplastic, and hyberbolic soil model. With finite element analysis capabilities, DeepEX provides practically all methods of analysis for deep excavation design.

The basic version does not include Finite Elements, though, our Non-linear analysis engine produces close-to-the-reality wall deflections and wall moments. External comparisons prove that the results using DeepEX are very close to the one produced by other Finite Element analysis programs.

What water analysis methods do you include in DeepEX?

The software offers the following options for modeling groundwater:

 

  1. Hydrostatic: Applicable for both conventional and elastoplastic analysis. In ELP, hydrostatic conditions are modeled by extending the “wall lining” effect to 100 times the wall length below the wall bottom.

Figure: Water pressures – Simplified flow

 

  1. Simplified flow: Applicable for both conventional and elastoplastic analysis. This is a simplified 1D flow around the wall. In the NL analysis mode, the traditional NL water flow option is employed.

 

Figure: Water pressures – Hydrostatic pressures

 

  1. Full Flow Net analysis: Applicable for both conventional and elastoplastic analysis. Water pressures are determined by performing a 2D finite difference flow analysis. In NONLINEAR, water pressures are then added by the UTAB command. The flownet analysis does not account for a drop in the phreatic line.

 

Figure: Water pressures – Full flownet

 

  1. User pressures: Applicable for both conventional and NL analysis. Water pressures defined by the user are assumed. In the nonlinear analysis, water pressures are added by the UTAB command.

Figure: User defined water pressures options in DeepEX

How am I sure that the results produced by DeepEX are accurate?

We have checked thoroughly all aspects and methods included in DeepEX. We have performed extensive verification examples, matching deflections from real projects throughout the United States. We can provide on demand an extensive verification document, containing a big number of verification examples, comparing software results with manual calculations and calculated deflections with real-project measurements.

Use Of The Software

Which wall types can I design using DeepEX?

DeepEX can be used to design:

  • Soldier pile and lagging walls (supported by reinforced concrete piles, steel beams, pipes, timber piles, channels etc)
  • Secant and Tangent pile walls (with steel reinforcement or steel sections)
  • Sheet pile walls
  • Diaphragms (Slurry) walls
  • Soldier pile and tremied concrete walls (SPTC)
  • Combined sheet pile walls (I beams or pipes combined with sheet piles)
  • Box sheet pile walls
  • Custom walls, that can be used to simulate any other wall type.

 

Figure: Wall types in DeepEX

 

Can I include more than one wall types or wall sections in the same model?

In DeepEX, the user can create several wall sections that can be assigned independently to the two main walls or to additional wall elements. The list of wall sections is global in the specific project file, meaning that the same or any sections from the list can be used in different walls of different design sections.

 

Figure: Wall sections in DeepEX

Is staging taken into consideration in DeepEX?

In DeepEX it is recommended to create all intermediate construction stages. The software calculates and presents results for each stage, which is important since the last stage is not always the most critical one. In Limit Equilibrium Method, each stage is independent, thus wall deflections (and likely wall bending moments) are not realistic for cases with multiple supports. In Non-linear analysis method the initial stage is geostatic without excavation. Wall deflections and wall moments depend on construction staging.

Figure: Wall deflection diagram, wall moments and support reactions in different stages

How can I change the default DeepEX parameters?

In order to change the software default settings, the user has to start the software as administrator, open the Settings dialog from the Help tab and press to set the current project as default.

Please review the steps below:

A. With the software closed, take the mouse over the software icon in your Desktop and RIGHT-CLICK on it.

B. From the menu that appears, please select to run the software as administrator.

C. Then, the Default settings dialog can be accessed in the Help tab of DeepEX, perform the changes and select to set current project as Default. This will change the default file that opens when the software normally opens.

How does DeepEX take into consideration the load from nearby buildings?

In DeepEX we can add a building as an external load, or simulate the building as an external strip surcharge:

 

  1. Adding a building load:

From the General tab of DeepEX we can select to add a building load and next click on the ground, close to the point where we wish to apply the building load. In the dialog that appears, we can define the exact building position, building size as well as several building properties (number of superstructure/understructure floors, number of columns, beam and column loads etc.):

    

  1. Adding a building as an external strip surcharge:

From the General tab of DeepEX, select to add a surface strip surcharge to the model:

 

Click on the model surface on 2 points, close where you wish to apply the building load:

In the dialog that appears we can define the exact load possition, magnitude and type (permanent/temporary). In addition, if we wish to include the building foundation, we can unselect the option “Is Surface”. This way we can also edit the load elevation, defining the foundation level for the load application.

Can the wall section change along the wall depth?

DeepEX offers the “Draw left/right wall element” tool. This allows the user to actually draw an additional wall element that can be placed either along the main wall, or on the left or right side of the main wall.

 

The additional wall elements can be used as main or slave walls:

 

A. Double click on the wall, edit the wall section and create all the wall sections that you need to use in your model.

B. Define the position, top elevation and depth of the main left wall.

C. Press on the arrow next to the option Edit 1st wall of the General tab of DeepEX and select to Draw left wall element (see figure below).

 

 

D. Draw an additional wall element below the main wall (click on 2 points). In the dialog that appears, define the wall section and position of the additional wall.

 

 

How do I simulate a traffic or construction load?

A traffic or construction load can be simulated in any DeepEX model. With the next procedure:

 

  1. From the General tab of DeepEX, select to add a surface strip surcharge to the model:

 

  1. Click on the model surface on 2 points, close where you wish to apply the load:

 

  1. In the dialog that appears we can define the exact load possition, magnitude and type (permanent/temporary).

 

  1. Pressing “OK” on the “Edit distributed load” dialog, will apply the changes on the model area. User can access the Edit load dialog any time by double-clicking on it. In addition, we can right-click on the applied load and select to activate/deactivate it in any construction stage.

 

Can I add an external surcharge in my DeepEX model?

External loads can graphically be added in the model area, using the draw loads tools provided in the General tab of DeepEX.

 

 

Adds a surface surcharge (define the start and end point of the surcharge).

Adds a surface line load (click a surface point to add a point load).

Adds a surcharge on the wall (define two wall points to add a surcharge).

Adds a line load on the wall (define a wall point to add a wall point load)

Adds a prescribed condition at a wall (click on the wall to add a prescribed condition). A prescribed condition is a predefined displacement or wall rotation (non-linear analysis)

Adds a footing load (3D) (define a point where to install a footing load).

Creates a new building (define a point where to install a building).

 

Adds a 3D surface load (click on it and draw a 3D load in the Plan view screen).

Click to manage the elastic load options (see paragraph 4.8).

 

Edit load combinations. Load combinations are user defined combinations where a load can be selected manually if it is favorable or unfavorable.

 

Assign a load combination. With this option, a load combination can be assigned to a specific design section.

 

Can I design both permanent and temporary walls in DeepEX?

DeepEX can design both the temporary and the internal permanent walls. The user can add the permanent walls to the model using the “Draw left/right wall element” tool (see question #16). This allows the user to actually draw an additional wall element that can be placed either along the main wall, or on the left or right side of the main wall. The additional wall elements can be used as main or slave walls.

Figure: External permanent and internal permanent walls in a metro station project designed with DeepEX

Can DeepEX consider a sealed excavation?

In the Analysis tab of DeepEX, we can choose to create a sealed excavation (create a liner effect).

 

Figure: Sealed excavation option in DeepEX

 

Figure: Water pressure diagram when sealed excavation option is selected

 

Can DeepEX calculate the seepage load?

When the full flownet analysis is selected, DeepEX calculates the seepage load on the dewatering side.

This result is presented on the Analysis and Checking Summary Table, which appears when the analysis is performed.

 

Figure: Seepage load calculated by DeepEX

 

Wall Passive, Active and Water widths in DeepEX

In DeepEX software, in the wall sections dialog, user can define the wall spacing, as well as, the widths to be used in the calculations of the active, passive and water pressures. The following options are available:

- Width d is originally the H beam flange size (if you use H steel beams as soldier piles). These are supposed to be driven piles.

If you wish to convert them to drilled piles, you change the width manually to actually specify the diameter of the hole were the steel beam will be installed and covered with concrete.

If you do reinforced concrete piles, then directly the width d is the diameterth of the concrete pile.

- S is the wall spacing.

For diaphragms and sheet piles you can use the value "1 ft" or "1 m" to review the results on screen per ft (or per meter) of the wall. In general, all the result values reported on screen are divided with the wall spacing to be presented /ft (or /m).

For secant pile walls you define the center to center distance for every other pile. For tangent and soldier piles you define the center to center distance of each pile.

- The Passive, Water and Active widths are the widths used below the excavation for the calculation of passive, water and active pressures respectively.

For continuous walls (like secant piles, tangent piles, diaphragms, sheet piles etc), normally you define the same value to all these parameters (Spacing = Water width = Passive width = Active width).

For non-continuous wall sections like soldier pile walls, there is no lagging below the excavation. In this case it is recommended to take:

For Passive Width: 2.5 to 3 times the pile width d (H beam flange width) (for driven steel piles) or 2.5 to 3 times the pile width d (diameter) (for circular drilled piles). This value is limited by the spacing, so if 2.5*Pile diameter > Spacing, you just use the spacing.

For Water and Active width: These should be equal to the flange or pile diameter, depending on the pile type (as above).

By pressing the "?" button in the wall sections dialog, all these options are presented and explained.

Project Types

Can I design a cantilever excavation using DeepEX?

DeepEX can design cantilever excavations. In Limit Equilibrium Analysis, user can select to use either the Free or the Fixed Earth Method for the cantilever calculations.

QnAs_Pic3.jpg

Figure: Cantilever excavation in DeepEX

Can I design a circular shaft using DeepEX?

DeepEX can design circular shafts, either cantilever, or supported by ring beams and cap beams.

Figure: Circular excavation with cap beam and ring concrete support in DeepEX

 

A circular shaft model can be created with the DeepEX Model Wizard. As shown on the instructions below:

 

  1. Open DeepEX Wizard and select the required unit system.

Figure: Define model unit system

  1. Select the analysis method, and the desired classical earth and water pressures method.

Figure: DeepEX Wizard – Welcome tab

 

  1. Select the project type and define the basic project properties (final excavation depth, wall length, circular shaft radius, tip of the wall elevation and water table).

Figure: DeepEX Wizard – Dimensions tab

  1. Define the project soil properties and stratigraphy.

Figure: DeepEX Wizard – Soil Layers tab

 

  1. Define the wall section properties.

Figure: DeepEX Wizard – Wall Type tab

 

  1. Define supports (cap beam, liner walls, ring beam supports).

Figure: DeepEX Wizard – Supports tab

 

  1. Define depth for each support level.

Figure: DeepEX Wizard – Stages tab

 

  1. Define surcharges.

Figure: DeepEX Wizard – Surcharges tab

 

  1. Define structural and geotechnical codes.

Figure: DeepEX Wizard – Codes tab

 

Can I design a dead-man wall using DeepEX?

DeepEX can design dead-man walls. The software takes into consideration the earth and water pressures, the external loads, as well as the interaction between the two walls.

Figure: Dead-man wall design in DeepEX

 

A dead-man wall can be created either by using the DeepEX Model Wizard, or manually in the model area with the tools included in the General tab of DeepEX.

When the model is manually created, then the following stages need to be included:

 

  1. Initial Stage: Define wall section properties, soil properties and stratigraphy. No excavation should be performed in the initial stage.
  2. Support Installation Stage: In this stage you should draw a ground anchor support (tierod), connecting the two walls. You can define the exact tierod elevation on the wall, the exact spacing between the tierods and the tieback section properties.
  3. Backfill Stage: Backfill between the two walls up to the top of the wall elevation.
  4. Final Excavation Stage: Excavate to the desired final excavation elevation.

 

Can I design a braced excavation using DeepEX?

DeepEX can design braced excavations. User can define multiple strut levels, as well as the strut and waler sections. The 3D Frame analysis module of DeepEX can be used to simulate the full shaft with all bracing for each support level.

Figure: Braced excavation in DeepEX – Design Section

 

A braced excavation can be created either by using the DeepEX Model Wizard, or manually in the model area with the tools included in the General tab of DeepEX.

 

If you create the model manually(model is manually created), then you have to include the following stages(the following stages need to be included):

 

  1. Initial Stage: Define wall section properties, soil properties and stratigraphy. No excavation should be performed in the initial stage.
  2. Excavation Stage: Excavate between the two walls to an elevation below the desired strut installation level. (Repeat for each support level)
  3. Support Installation Stage: Draw a strut support, connecting the two walls. You can define the exact strut elevation on the wall, the exact spacing between the strut and the strut section properties. (Repeat for each support level)
  4. Final Excavation Stage: In this stage you should excavate to the desired final excavation elevation.

Can I design a top-down excavation using DeepEX?

DeepEX can be used for the design and analysis of top-down excavations. Basement and intermediate floor slabs can be added as supports and they can be designed with DeepEX.

Figure: Top-down excavation with concrete slabs in DeepEX

 

A top-down excavation can be created either by using the DeepEX Model Wizard , or manually in the model area with the tools included in the General tab of DeepEX.

If model is manually created, then the following stages need to be included:

 

  1. Initial Stage: Define wall section properties, soil properties and stratigraphy. No excavation should be performed in the initial stage.
  2. Excavation Stage: Excavate between the two walls to an elevation below the desired slab installation level. (Repeat for each support level)
  3. Support Installation Stage: Draw a slab support, connecting the two walls. You can define the exact slab elevation on the wall and the slab section properties. (Repeat for each support level)
  4. Final Excavation Stage: In this stage you should excavate to the desired final excavation elevation.

Can I design a bin-type wall using DeepEX?

DeepEX can design bin-type walls. The two main walls can be connected with tierods and user can choose to excavate outside the walls.

Figure: Bin type wall design in DeepEX

 

bin-type can be created either by using the DeepEX Model Wizard, or manually in the model area with the tools included in the General tab of DeepEX.

 

 

If the model is created manually, then the following stages need to be included:

 

  1. Initial Stage: Define wall section properties, soil properties and stratigraphy. No excavation should be performed in the initial stage.
  2. Excavation Stage: Excavate outside the two walls to an elevation below the desired tierod installation level. (Repeat for each support level)
  3. Support Installation Stage: Draw a tierod, connecting the two walls. You can define the exact tierod elevation on the wall and the tierod section properties. (Repeat for each support level)
  4. Final Excavation Stage: In this stage you should excavate to the desired final excavation elevation.

 

How can i design a gravity retaining wall with DeepEX?

DeepEX offers the possibility to use a gravity retaining wall. This option is available with the additional Gravity Wall module. User has the flexibility to create basic types of retaining walls such as full gravity or with stem. Flexural, reinforcement can be included where ever desired. A gravity wall can also be used as a pier or an abutment wall with piles.

The use of gravity wall in the model can be defined in the “Edit wall data” dialog of DeepEX (Figure 1). When the Gravity wall module is activated, there appears the option “Use gravity wall section”.

The “Edit wall data” dialog appears when user double-clicks on the wall in the Model area of DeepEX.

Figure 1: The Edit wall data dialog with “Use gravity wall section” option.

 

Then the following option is selected, user should press on the button Edit Section Data. This will cause the “Retaining wall data” dialog to appear (Figure 2). Here, the user can define the retaining wall dimensions and reinforcement.

 

QnAs_Pic47.JPG

Figure 2: Retaining Wall Data Dialog

 

Depending on the selected wall type on the left side of this dialog, several dimension properties are available to be defined (Table 1). The reference coordinate for a gravity wall is taken as the left most corner of the stem (or top of wall). This coordinate is defined from the main wall data dialog.

Table 1: Dimension properties

Height

Total wall height (excluding the key if used)

Base

Total base wall width

Top width

Top of the wall width

Dist. To top left corner

Distance to top left corner from the far left side of the wall

Heel thick

Base thickness on the driving side

Toe width

Distance from the end of the main wall body to the end of the wall toe

Toe thick

Base thickness on the resisting side

The following retaining wall types are available in DeepEX:

 

Symbol/Option

Description

Use key

Select this option in order to use a passive key under the wall

Drain back face

Drains back wall face when the water table is above the wall base

 

Calculate Driving Pressures from edge of wall: In the default mode, stability safety factors are calculated from soil and other pressures directly acting on the driving wall sides. While this assumption gives very good, approximate results, in theory the driving horizontal pressures can be taken at the wall edge. By selecting this option, safety factors are calculated by pressures acting directly on a vertical wall edge that is defined from the left most base coordinate if pressures are driving from left to right or the right most coordinate if pressures are driving from right to left. If this option is selected, then driving soil pressures on this vertical edge are always taken as Active or At-rest.

The reinforcement data table enables the use of reinforcing bars on each wall face. Please note that DeepEX does not account for development lengths and reinforcement bending. It is the final responsibility of the engineer to decide how reinforcement has to be bent, cut, or shaped for fabrication. DeepEX though will calculate and report all bending and shear capacities.

Model Optimization

Can DeepEX optimize the wall length?

The software provides two options for the wall embedment optimization in Limit Equilibrium Analysis:

A. Define the wall depth manually and check the calculated wall embedment safety factors.

After the analysis is performed, the Analysis summary table appears. There wecan review the most critical results among all stages. We have to make sure that all 3 wall embedment factors (length, passive, rotational) are above a limit (typically this could be 1 , 1.2, 1.3, 1.5 depending how you design).

After we close this summary table, we can still open the Wall Embedment FS results in the results tab of DeepEX for each stage:

 

B. Automatic wall embedment software optimization use:

When using the Limit Equilibrium Method (LEM), the wall length can be optimized based on the wall embedment safety factors.

 

This option can be located at the Design Tab of DeepEX and it is available only when LEM analysis is selected. There, the required safety factor can be defined for the cantilever stage and for the supported excavation stages. The software will change the wall length to achieve the wanted wall embedment FS.

 

 

Can DeepEX optimize the wall section?

DeepEX offers optimization tools that can help the user to optimize the wall and support sections. Though, the user should select the original wall type and run the analysis. The software keeps the wall type and proposes wall sections that offer enough structural capacity. Th ser can select the ideal section from lists of suitable sections presented by the software.

 

Figure: Optimization tools of DeepEX

 

Figure: Option to optimize the wall section in DeepEX

Figure: Proposed steel beam sections from wall section optimization

 

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