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Tutorial 6: Excavation outside of two walls connected with a tieback. Deep Excavation LLC. DeepXcav 2011 – Advanced course. 1. INTRODUCTION .

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Tutorial 6: Excavation outside of two walls connected with a tieback

Deep Excavation LLC

DeepXcav 2011 – Advanced course

1

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INTRODUCTION

DeepXcav 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 or LRFD).

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

The program also offers the ability to perform slope stability analyses with soil nails.

Corso Paratie, Milano 30 settembre 2009

DeepXcav 2011 – Advanced course

2

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Change the Surface Level to 100 m

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

Change the Elevation to 100 m and select All Boreholes

Press Ok

DeepXcav 2011 – Advanced course

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Add 2nd Wall

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

DeepXcav 2011 – Advanced course

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Edit Wall Section

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

DeepXcav 2011 – Advanced course

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Edit Wall Properties

Press the Edit Section Data button

Change the wall depth to 20m

Change 2nd wall x-coordinate to 20 m

Press Ok

DeepXcav 2011 – Advanced course

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Change the Wall Width to 0.8m

Press Ok

DeepXcav 2011 – Advanced course

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Add new Stage

Go to the Model Tab

Press the Add Stage Button

DeepXcav 2011 – Advanced course

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Perform a 3m Excavation left and right of the two walls the two walls and add a new Stage

Change the left and right elevation to 97 m

Click on the Add Stage button

DeepXcav 2011 – Advanced course

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Add a tieback connecting the two walls

Press the Add a Tieback button

Click on the two walls to connect them with a tieback

DeepXcav 2011 – Advanced course

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Change the tieback properties

Change the z-coordinate of the support to 97.5

Go to the Tab B. Prestress-Unbraced

Select the Adjust Prestress option

Adjust Prestress 250 KN

Press Ok

DeepXcav 2011 – Advanced course

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Add a new Stage and excavate 4 m

Change the left and right elevation to 93 m

Change the water elevation to 93 m

Add a new Stage

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Calculate the Design Section

Press the Calculate the selected Design Section button

DeepXcav 2011 – Advanced course

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Results – Wall Deflection, Stage 3

Go to the Results Tab

Select Dx to show the Wall Deflections

Select to shoe min, max values

DeepXcav 2011 – Advanced course

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Results – Wall Moment , Stage 3

Select to show the Wall Moment Capacity

Select Wall Mom. to show the Wall Moment

DeepXcav 2011 – Advanced course

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Results – Wall Shear, Stage 3

Select to show the Wall Shear Capacity

Select Wall Shear

DeepXcav 2011 – Advanced course

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Results – Tieback Reaction, Stage 3

Select to show the Support Reactions

DeepXcav 2011 – Advanced course