Tutorial 7: Two Walls: Backfill and Excavation

Deep Excavation LLC

DeepEX 2015 – Advanced course 1

DeepEX is a software program for braced excavations in soils with 2D limit-equilibrium and non-linear analysis

methods, and structural verification of all elements (with AISC, ASD, Eurocodes).

It offers the ability to analyze walls with multiple braces (tiebacks) in multilayered soils.

The non-linear analysis considers elastoplastic behavior for the whole soil-wall-support system.

The program also offers the ability to perform traditional limit-equilibrium analyses.

The graphical interface is completely interactive and the input is simplified to a great extend.

The program utilizes archives of wall types, structural and soil materials, ground anchors etc.

The analysis can be performed in either an utlimate state or at a service state (allowable design, LRFD, or Eurocode 7

design approach methods).

The program offers the ability to automatically set all critical settings according to the desired design methodology.

Corso Paratie, Milano 30 settembre 2009

INTRODUCTION

DeepEX 2015 – Advanced course 2

Change the Surface Level to -3 m

Go to the General Tab and press the Move Model Elevation button

Change the Elevation to -3 m and select All Boreholes

Press Ok

DeepEX 2015 – Advanced course

Change units to metric

Set sizes and other standards to metric• Go to design tab • Design codes can be changed by clicking on

the CODE button or on the drop down

At Stage 0, go to Model Tab and press the Add 2nd Wall button.

Add 2nd Wall

DeepEX 2015 – Advanced course

By double-clicking on the wall, you can change the wall properties

Edit Wall Section

DeepEX 2015 – Advanced course

Edit Left Wall Data

Set the top Wall Elevation to 0

Change the Wall Depth to 7m

Press Ok

Press Edit Section Data

DeepEX 2015 – Advanced course

Edit Left Wall Section Properties

Select a Sheet pile wall

Select a Sheet pile AZ 19 Section

Press Ok

DeepEX 2015 – Advanced course

Edit Right Wall Data

Set the top Wall Elevation to 0

Change the Wall Depth to 15m

Press Edit Section Data

Change the Wall x-coordinate to 20m

DeepEX 2015 – Advanced course

Edit Right Wall Section Properties

Select a Sheet pile wall

Select a Sheet pile AZ 25 Section

Press Ok

Add a new Wall Section

DeepEX 2015 – Advanced course

Press Ok

Apply the new Wall Section

Select and apply the new Wall Section

DeepEX 2015 – Advanced course

Add a new Stage and a tieback 1. Press the Add Stage button

2. Select “Draw ground anchor” to draw the tierod

3. Select the two Walls to add the tieback

DeepEX 2015 – Advanced course

Edit Tieback Properties

Change the tieback’s Elev. z-coordinate to -2.5m

Press Ok

Press Edit

Press Add New Tieback Section

Select D32 and 1 bar (Grade 150)

DeepEX 2015 – Advanced course

Edit Tieback Properties

Press Ok

Select Tieback Section

DeepEX 2015 – Advanced course

Add a new Stage and Backfill1. Press the Add Stage button2. Change the Left and Center

Elevation to 0

DeepEX 2015 – Advanced course

Add a new Stage and Excavate 4m to the right side1. Press the Add Stage button (stage 4)

2. Change the Right Elevation to -7

DeepEX 2015 – Advanced course

Calculate Design Section

Press Calculate Selected Design Section

DeepEX 2015 – Advanced course

Result summary (when completed)

Results – Wall Deflections , Stage 3

Press Dx to show Wall Deflection

Press to show min, max values

Results – Wall Moment , Stage 3

Press to show Wall Moment

Press to show Wall Moment Capacity Press to Show Env. to display

envelope for all stages

Results – Wall Shear, Stage 3

Press to show Wall Shear

Press to show Wall Shear Capacity

Results – Support Reactions, Stage 3

Press to show Support Reaction

Interaction between two walls• When Limit-Equilibrium is performed with Non-linear analysis,

program calculates interaction surcharge on lower wall as a percentage of the resisting pressures.

Horizontal soil pressures

• From elastoplastic analysis