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Tutorial 6: Excavation outside of two walls connected with a tieback. Deep Excavation LLC. DeepXcav 2011 – Advanced course. 1. INTRODUCTION . - PowerPoint PPT Presentation
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Tutorial 6: Bin type walls with tierod
Deep Excavation LLCDeepEX 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
Program layout
Wall selection
Project tree view
Design section list(right click)
General input tabsFile menu (click)
Model stages (right click options similar to
excel)Command prompt (enter coordinates)
Press to perform calculations.
Instruction box
Model space (left or right click on any item)
Mouse is over item Units
DeepEX 2015 – Advanced course
3D Model (Frames)
View and other
Enter basic project information1. Select this button
2. Define the project name etc.
3. Press OK
DeepEX 2015 – Advanced course
Move model elevations1. Select this button
2. Set new reference elevation to 100 ft
3. Check All boreholes (this moves all soil
layers)
4. Press OK
1. Add a 2nd wall2. Double click on right wall3. Change dimensions3.1 Change xwall= 60ftDepth L= 45ft
Define basic model limits (top, bottom, left, right)
1. Select this button
2. Set Top= 130ftBottom= 40ft
Left= -60ftRight= 120ft
3. Press OKDeepEX 2015 – Advanced course
Modify soil types (database of soils)1. Select this button.
Or
Expand the Soils Tree and Double click on FOptions: Right click or press Delete
Note: In DeepEX you can use any soil type in more than one borehole. For example the F soil can be used in boring 1 or boring 2 etc.
You can use any Boring on any design section. Thus changing any property of the F soil will affect all the excavation Design Sections where F is used!
Boring with F soil
Soil type data form
Available soil types
Add new, copy, delete, paste soil
DensityStrength
Short soil name, description and color.
Soil type & initial clay behavior
Test data for estimating soil properties
DeepEX 2015 – Advanced course
Soil type continuedSoil properties: GeneralSoil name: F (this appears in the boring)Description: Detailed soil description.Soil type: Sand gt= 125 kcf : Total unit weightgdry= 120 kcf : Dry unit weight (above water table)c‘= 0 : Effective cohesionF’= 30 degrees : Effective friction angle
v= 0.35 Poisson’s ratio
Kx = Horizontal permeabilityKz = Vertical permeability
Parameters only for claysSu = Undrained shear strengthFcv= Constant volume shearing angleFpeak= Peak shearing angle
DeepEX 2015 – Advanced course
Soil properties (Resistance and Elastic)
KoNC = At rest lateral earth pressure coefficient for normally consolidated state.
Enter elasticity values as shown before. Click on > buttons for more options.
DeepEX 2015 – Advanced course
Soil S1Soil properties: Change S1A. GeneralSoil name: S1 (this appears in the boring)Description: Sand Detailed soil description.Soil type: Sand gt =125 pcf : Total unit weightgdry= 120 pcf: Dry unitc‘ 0: Effective cohesionF’ = 36 degrees : Effective friction angleV = 0.35 Poisson’s ratio
C. Elasto-plasticE = 500 ksfrEur = 3
D. BondUltimate bond = 30 psi
Press OK
Edit Borings (soil layers)To edit the soil layers double click on the model boring.
The borings can also be edited from:
a) Edit Borings Button.
Or from the:
b) Tree View – Stratigraphy – boreholes
Double click here (or right click) with the mouse.
DeepEX 2015 – Advanced course
Enter Soil LayersTo edit the soil layers click on the blue button and enter the top of layer elevation.
For this example type 90 here:
Then select soil type S1 here:
DeepEX 2015 – Advanced course
Press OK
DeepEX 2015 – Advanced course
Double click on wall
DeepEX 2015 – Advanced course
2. Select edit section data, to change wall properties
1. Change wall depth to 45ft
DeepEX 2015 – Advanced course
Number of nodes controls the divisions
along the wall in a limit-equilibrium analysis.
(Suggested 200 min, or set so that small
intervals (0.25 ft) are generated)
Change wall section AZ 19 sheet pile
1. Change wall type
2. Select AZ-19 section
3. Select A50 steel(fy= 50 ksi)
4. Select OK
DeepEX 2015 – Advanced course
Wall using AZ-19 wall section
Select OK
DeepEX 2015 – Advanced course
Add a new stage (Model Tab)
Or right click (to add a stage, similar to Excel)
DeepEX 2015 – Advanced course
Stage 1 change external elevations to El. 90
Stage 1
DeepEX 2015 – Advanced course
Add Stage 2: Add a strut at El. +92
Right click and add stage 2
DeepEX 2015 – Advanced course
Select tool to add a tieback
Note: After selecting the “Draw ground anchor button” the program tells you to select/enter the 1st tieback point at the wall (x z)
DeepEX 2015 – Advanced course
Add tieback with mouse1. Select 1st point on left wall (we will modify the coordinates later)
2. Select 2nd point on right wall when wall highlights
Edit tieback properties (support options)1. Change dimensions z= 92 ft (elevation)Horizontal spacing to 5ft (length is determined by program)
Select OK
DeepEX 2015 – Advanced course
Edit tierod section to #18 bar – 80ksi• Select solid bar• Change grade to 80• Select #18 bar• Specify one bar per
tierod• Dfix does not play a
role
DeepEX 2015 – Advanced course
Add a surcharge on the center surface. Select this tool button.
DeepEX 2015 – Advanced course
Add surcharge with mouse
2. Select 2nd point
1. Select 1nd point on left
DeepEX 2015 – Advanced course
Modify surcharge
1. Change coordinates X1= -22 X2= -2
2. Change surchargeqz1= 0.6 ksf qz2= 0.6 ksf
Point 1 is on the left sidePoint 2 is on the right side
3. Select OK
DeepEX 2015 – Advanced course
Wall index refers to which wall the load is
applied: 0 = left wall, 1= right wall, -1 all walls
Add stage 3: Excavate to El. 80ft left and right side
Right click and add stage 3
DeepEX 2015 – Advanced course
On stage 3: Go to Analysis tab
1. Change analysis mode to “Limit Equilibrium and Beam Elastoplastic Foundations”
DeepEX 2015 – Advanced course
In this mode, DeepEX first performs a limit-equilibrium analysis and stores the conventional wall embedment safety factors. Then, DeepEX runs the elastoplastic solution (non-linear) and stores wall moments, shears, displacements and other parameters from the non-linear analysis.
No wall friction to be used• Wall friction (wall to soil) is ignored because walls are not expected to
experience vertical movement (Analysis tab)
Select US structural codes (Design Tab)1. Select US allowable settings from Design tab
DeepEX 2015 – Advanced course
1. Concrete code and Steel Code(1.6 is safety on Ultimate cap)
2. Clay behavior
3. Water pressure analysis
4. Driving pressures Ka = Active without wall friction5. Resisting pressures Kp/1.5 = Passive divided by 1.56. Table displays assumptions for both limit-equilibrium and non-
linear analysis
Review Assumptions (Yellow table Stage 2)
DeepEX 2015 – Advanced course
Analyze the model (current design section)
DeepEX 2015 – Advanced course
Analyzes all design sections
Summary table (all Design sections)
DeepEX 2015 – Advanced course
Summary table (Selected design section all stages)
Note: You may select another design section or another wall (when a 2nd wall is used) Press EXIT
DeepEX 2015 – Advanced course
Results Tab (for viewing results on model screen)
Wall embedment and other safety factors
Wall moment, shear, axial, displacement.Support reaction R.
Display wall capacity (moment and shear), Stress ratios(ratios <1 OK)
Display stresses and pressures on walls.
Display soil mass stresses (when water flownet analysis is performed)
Click on Min-Max to display min and max values.Show ENV= Show result envelope (this design section)
Tables and diagrams
DeepEX 2015 – Advanced course
Results on model
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