Tutorial 6: Bin type walls with tierod
Deep Excavation LLC
DeepEX 2015 – Advanced course
1
INTRODUCTION
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
DeepEX 2015 – Advanced course
2
File menu
(click)
Design
section list
(right click)
Project tree
view
3D Model
(Frames)
Wall
selection
View and
other
Model stages (right
click options similar to
excel)
Program layout
General input tabs
Model space (left or right click
on any item)
Mouse is over
item
Command prompt
(enter coordinates)
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Instruction
box
Units
Press to perform
calculations.
Enter basic project information
1. Select this
button
2. Define the
project name etc.
3. Press OK
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1. Select this
button
Move model elevations
2. Set new reference
elevation to 100 ft
3. Check All boreholes
(this moves all soil
layers)
4. Press OK
1. Add a 2nd
wall
2. Double click
on right wall
3. Change
dimensions
3.1 Change
xwall= 60ft
Depth L= 45ft
Define basic model limits
(top, bottom, left, right)
1. Select this
button
2. Set Top= 130ft
Bottom= 40ft
Left= -60ft
Right= 120ft
3. Press OK
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Modify soil types
(database of
soils)
1. Select this button.
Or
Expand the Soils Tree and Double click on F
Options: 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
Short soil name,
description and color.
Available soil
types
Soil type & initial
clay behavior
Density
Strength
Add new, copy,
delete, paste soil
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Test data for estimating soil
properties
Soil type continued
Soil properties: General
Soil name: F (this appears in the boring)
Description: Detailed soil description.
Soil type: Sand
gt= 125 kcf : Total unit weight
gdry= 120 kcf : Dry unit weight (above water table)
c‘= 0 : Effective cohesion
F’= 30 degrees : Effective friction angle
v= 0.35 Poisson’s ratio
Kx = Horizontal permeability
Kz = Vertical permeability
Parameters only for clays
Su = Undrained shear strength
Fcv= Constant volume shearing angle
Fpeak= Peak shearing angle
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Soil properties (Resistance and
Elastic)
Enter elasticity values as shown before.
Click on > buttons for more options.
KoNC = At rest lateral earth pressure
coefficient for normally consolidated state.
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Soil S1
Soil properties: Change S1
A. General
Soil name: S1 (this appears in the boring)
Description: Sand Detailed soil description.
Soil type: Sand
gt =125 pcf : Total unit weight
gdry= 120 pcf: Dry unit
c‘ 0: Effective cohesion
F’ = 36 degrees : Effective friction angle
V = 0.35 Poisson’s ratio
C. Elasto-plastic
E = 500 ksf
rEur = 3
D. Bond
Ultimate 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.
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Enter Soil
Layers
To 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:
Press OK
DeepEX 2015 – Advanced course
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Double
click on
wall
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2. Select edit section data,
to change wall properties
1. Change wall
depth to 45ft
Number of nodes
controls the divisions
along the wall in a limitequilibrium analysis.
(Suggested 200 min, or
set so that small
intervals (0.25 ft) are
generated)
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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
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Wall using AZ-19 wall section
Select OK
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Add a new stage (Model Tab)
Or right click (to add a stage, similar to Excel)
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Stage 1 change external elevations to El. 90
Stage 1
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Add Stage 2: Add a strut at El. +92
Right click and add stage 2
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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)
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Add tieback with mouse
1. 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
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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
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Add a surcharge on the center
surface. Select this tool button.
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Add surcharge
with mouse
2. Select 2nd point
1. Select 1nd point on left
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Modify
surcharge
1.
2.
Change coordinates
X1= -22 X2= -2
Change surcharge
qz1= 0.6 ksf qz2= 0.6 ksf
Point 1 is on the left side
Point 2 is on the right side
Wall index refers to
which wall the load is
applied: 0 = left wall, 1=
right wall, -1 all walls
3. Select OK
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Add stage 3: Excavate to El. 80ft left and right side
Right click and add stage 3
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On stage 3: Go to Analysis tab
1.
Change analysis mode to “Limit Equilibrium and Beam Elastoplastic Foundations”
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.
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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
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Review Assumptions (Yellow table Stage 2)
1.
2.
Concrete code and Steel Code
(1.6 is safety on Ultimate cap)
Clay behavior
3.
Water pressure analysis
4.
5.
6.
Driving pressures Ka = Active without wall friction
Resisting pressures Kp/1.5 = Passive divided by 1.5
Table displays assumptions for both limit-equilibrium and nonlinear analysis
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Analyze the model (current design
section)
Analyzes all design sections
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Summary table (all Design sections)
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Summary table (Selected design section all stages)
Note: You may select another design section or another wall (when a 2nd wall is used)
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Press EXIT
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 Display soil mass
and pressures on stresses (when
water flownet
walls.
analysis is
performed)
DeepEX 2015 – Advanced course
Tables
and
diagrams
Click on Min-Max to
display min and
max values.
Show ENV= Show
result envelope
(this design section)
Results on model