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DeepEX 2020

Solving Deep Excavation Design

DeepEX 2017 talk to it and design your deep excavation!

Deep Foundation Software, Pile Rafts, Pile Groups

From soil estimation to axial and lateral pile capacity

DeepFND - Deep Foundation Software, caissons, CFA, drilled piles, driven piles, concrete, timber

From soil estimation to helical pile settlement estimation.

New helical pile software HelixPile
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What do you want to design?
DeepFND 2020: Deep Foundation software (NEW: Pile-Group/Pile Raft Analysis!)
DeepEX 2020: Deep Excavation software
Soldier pile walls
Sheet pile walls
Secant pile Walls
Tangent piles
Diaphragm Walls
Soldier and Tremied Concrete
Soil Mix walls
Combined king pile sheet piles
Slope stability
Cost estimation for braced excavations
Waler-Strut Cofferdams
Snail-Plus 2019: Soil nailing - soil nailing walls
SiteMaster: Inclinometer software (adopted by Geokon)
HelixPile: Helical Pile Software
RC-Solver: Concrete Design ACI-318, EC2, EC8
Steel-Beam: Steel beam column design, full equations, AISC, EC3

Soldier pile wall with raker supports, SI units

A. Project description

In this example we will design a soldier pile wall supported by raker supports, supporting a 9.14 m excavation. Tables 1 and 2 present the soil properties and the stratigraphy respectively. Table 3 presents the external loads. Table 4 presents the wall properties. Table 5 presents the support properties. The general ground elevation is 11.887 m and the general water elevation is –2.7 m.

Table 1: Soil properties

Name

Soil Type

Φ'

(deg)

c'

(kPa)

Su

(kPa)

γt

KN/m3

γdry

KN/m3

Kx

m/sec

Kz

m/sec

Eload

kPa

Eur

kPa

qskin,u

kPa

F

Sand

30

0

-

18.84

18.84

0.0001

0.0001

14370

43110

49.7

S2

Sand

32

0

-

21.195

21.195

0.0305

0.0305

19160

57480

0

S1

Sand

32

0

-

20.41

20.41

0.0001

0.0001

19160

57480

150.3

Table 2: Stratigraphy (Boreholes)

Soil Layer Name

Top Elevation (m)

OCR

Ko

F

11.887

1

0.577

S2

6.401

1

0.47

S1

-0.305

1

0.47

Table 3: External loads

Name

Type

Position

(X0,Z0)

(X1,Z1)

Q0

Q1

0

Surcharge

On the ground

(-7,11.887)

(-1.5,11.887)

25 kPa

25 kPa

Table 4: Wall properties

Type

Soldier Pile Wall

Steel

A50

Top Elevation (m)

11.887

Height (m)

18

Thickness (m)

0.59

Steel Section

HE 600A

Lagging Thickness (cm)

7.62

Lagging position

Center of the wall

Lagging Material

Construction Timber

Table 5: Support properties

Name

Type

Elevation on the wall (m)

Angle (deg)

Free length (m)

Fixed length

(m)

Hor. Spacing

(m)

Section

0

Raker

10.058

145

13.716

-

4

W14x109

1

Raker

7.01

160

12.192

-

4

W14x109

B. Modeling with DeepEX

B1. Use of DeepEX

Figure 1: Edit soil properties dialog.

Figure 2: Edit soil layers dialog.

Figure 3: Edit wall properties dialog.

Figure 4: Wall data dialog

Figure 5: Support options.

After drawing the support on the model, the Edit support data dialog appears (i.e. for tieback supports, Figure 6).

Figure 6: Edit support data dialog.

Figure 7: Load options.

After drawing the load on the model, the Edit surcharge dialog appears (i.e. for sitrip surcharges, Figure 8).

Figure 8: Edit distributed load dialog.

Figure 9: Surface options.

Figure10: Water elevation – settings.

With the draw custom water surface tool, we can draw a non-horizontal groundwater table. To do this, select this option and then start clicking the left mouse button from left to right (press enter to complete). To delete the custom water line, move on top in the model and press delete.

The draw a U line tool is used to draw a line of constant pore pressure in the model. This line is only used in slope stability analysis.

The define user water pressures tool launches the dialog for defining custom values of water pressures next to the walls. Please note that in the non-linear engine, two consecutive zero values of water pressure still count in increasing the total vertical stress by γw (see theory manual).

Figure 11: Ground water table.

B2. Example simulation

In DeepEX 2014 we can design our projects using construction stages. After the model is designed, the software calculates each construction stage, reassuring that the model is stable, since the last stage is not always the critical one. Next, we provide the steps in each construction stage, in order to simulate the project in DeepEX.

  1. Define the soil properties

  2. Define the soil layers (stratigraphy)

  3. Define the wall section and wall properties

Figure 12: Model, Stage 0.

  1. Excavate on the right side of the wall to Elevation 9.45 m.

  2. Create right slope surface with angle 145 degrees.

Figure 13: Model, Stage 1.

  1. Apply raker support row at elevation 10.058 m.

Figure 14: Model, Stage 2.

  1. Excavate on the right side of the wall to Elevation 5.79 m

  2. Create right slope surface with angle 165 degrees.

  1. Apply raker support row at elevation 7.01 m.

  1. Excavate on the right side of the wall to Elevation 2.74 m (final excavation level).

Figure 15: Model, Stage 5.

In DeepEX we can design several design sections in the same model. We can add new design sections as new or as copies of the existing ones, doing several modifications in the model, or just defining different standards, calculation or analysis methods.

C. Results in DeepEX

Since the model is ready, we can choose to calculate the design section, pressing on the button .

After the analysis is succeeded, the Summary table appears. Table 6 below includes some critical checks and values for each construction stage. Figures 16 to 19 present some graphical results from the results tab of DeepEX.

Table 6: DeepEX critical results/stage

Figure 16: Moment diagrams, Stages 3 and 5 respectively.

Figure 17: Shear diagrams, Stages 2 and 3 respectively.

Figure 18: Wall deflection diagrams, Stages 2 and 3 respectively.

Figure 19: Effective horizontal soil pressures, Stages 4 and 5 respectively.

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