A new underground tunnel section is designed by a geotechnical consultant. For the underground station a 5 m wide braced excavation is made in a saturated clay as shown in Figure Q3 with unit weight, y = 18.5 kN/m, friction angle, o = 0° and cohesion, e = 20 kN/m². The struts are spaced at 5 m center to center in plan. Refer Appendix 1 to select the sheet-pile section. i. Draw the strut forces. ii. Determine the section modulus of the sheet pile needed. Assume oall = 170 MN/m? ii. Determine the maximum moment for the wales at levels B and C. Show a complete answer, including all numerical values and necessary diagrams. 5 m A 1 m

Q: For a factor of safety of 2 on the passive resistance, determine the required depth of penetration…

A: Given,D' - initial trial depth of penetrationkp - Passive earth pressure coefficient.Dense sand (kp)…

Q: center-to-center spacing of struts in the plan = 5

A:

Q: Refer to Figure 15.10a. For the braced cut, given H = 8 m; H, = 3 m; y, = 17.5 kN/m³; angle of…

A: Question is based on the braced cut through a wall . Height of wall , sand layer and clay layer are…

Q: 6. An embankment is shown in Figure below. Given that B=7m, H = 6m, m=2, z = 3m and y= 18kN/m³ (a)…

A:

Q: Find the allowable capacity of the belled caisson shown. The diameter of the bottom of the bell is 4…

A:

Q: A vertical sheet piled wall is shown in Fig. below, the properties of the soil both behind and front…

A:

Q: A vertical cut is made in a purely cohesive soil with a volumetric weight of ym = 1.90 cohesion of…

A:

Q: 5. A vertical sheet pile supports a horizontal backfill having a height of 4.5 m. The backfill has…

A:

Q: Assuming a sheet pile wall is constructed to retain 12.5m of soil, as shown in Figure 2, and the…

A:

Q: Determine the factor of safety against bottom heave for the braced cut assuming that the length of…

A: (1) Length of the excavation(2) Width(3) Hight(4) Cohesion(5) Angle of friction(6) Density

Q: 9.5 Refer to Figure 9.14. Given: L = 4 m; for sand, y = 16 kN/m2: ø' = 35°; and, for clay, Yat =…

A: Question is based on cantilever sheet pile wall penetrating a granular value. Length , unit weight…

Q: A 10.5m deep excavation in clay is to be retained with an 18m long sheet pile wall. The excavation…

A: H=10.5 msheet pile (H) = 18 mTo find- Apparent pressure diagram

Q: Figure below shows an excavation in sand, supported by braced sheet pile walls. The unit weight of…

A:

Q: 8) A sheet-pile wall retaining a silty sand is shown in the figure. Using the Rankine formula, the…

A: Cohesion = 0 Angle of internal friction = 32°. To find: passive earth pressure coefficient.

Q: please an

A: The objective of the question is to calculate the required depth of penetration, the total active…

Q: Q.01 0.02 0.04 0 06 0.10 0.2 0.50 L 04 0.6 1.0 2 3456 8100 0.60 12.0 m 18.0m 19.0m 045 0.45 6.0 m 0…

A: Solution:- We know that the equation obtained by Boussinesq for computing vertical stress for…

Braced cuts

The braced cut is a method of providing lateral support to the soil in foundation trenches, to prevent the trenches from deformation by the caving in of soil and resisting it from moving laterally. During shallow excavation in firm soil, generally, slopes are provided to resist the caving in of soil. During shallow excavation in soft soil and deep excavation, the chances of caving in of soil increase. Hence, it becomes necessary to make a provision to resist the deformation of trenches due to caving in of soil. The braced cut is the method used for such conditions. The excavation using braced cuts is a bit uneconomical as compared to the traditional open-cut excavation method but provides better safety than the cut excavation method.