Tutorial 7: Two Walls: Backfill and Excavation Deep Excavation LLC DeepEX 2015 – Advanced course1

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 course2

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 2 nd Wall button. Add 2 nd 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 Backfill 1. Press the Add Stage button 2. Change the Left and Center Elevation to 0 DeepEX 2015 – Advanced course

Add a new Stage and Excavate 4m to the right side 1. 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