Answered: 180 160 140 120 100 80 riator stress q…

Engineering

Civil Engineering

180 160 140 120 100 80 riator stress q (kPa)

Principles of Geotechnical Engineering (MindTap Course List)

9th Edition

ISBN:9781305970939

Author:Braja M. Das, Khaled Sobhan

Publisher:Braja M. Das, Khaled Sobhan

Chapter17: Subsoil Exploration

Section: Chapter Questions

Problem 17.2P

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Concept explainers

Measuring site work, Excavation and Piling

Bid drawings typically include very little material about the precise requirements of site work operations, measuring site work and excavation work differs from measuring most other works on a construction project. The actual site work conditions are not provided and also the dimensions of the excavations are not known during the pre-construction phase. The precise measurement of the excavation and backfill of the earth material and topsoil is important for a contractor to decide upon the total cost required for the process. All the works should be carried out under OSHA (Occupational Safety and Health Administration) standards to ensure the safety of the workers.

Question

Please answer the questionoa and show all work

Shear strength
Group Members:
180
160
140
120
100
80
60
40
• 45 kPa
• 90 kPa
20
• 135 kPa
2
4
6.
8
axial strain ɛ, ()
80
70
60
50
40
30
20
10
• 45 kPa • 90 kPa • 135 kPa
0.
2
4
8.
axial strain &, (%)
deviator stress q (kPa)
excess pore water pressure Au (kPa)

Transcribed Image Text:Refer to the triaxial shear test data in the handout to answer the following questions. You may work in groups of 2 to 3. a) What type of triaxial test was performed (CU, CD, or UU)? How can you tell? b) Samples of Soil 2 (see profile below) were obtained for the triaxial shear tests. Based on the results of the triaxial shear tests and the soil profile shown below, calculate the long- term shear strength of the soil at point A. 2 m Soil 1: Yt = 17.0 kN/m3 5 m (above GWT), Soil 1 Ysat = 19.0 kN/m3 (below GWT) 3 m Soil 2 6 m Soil 2 (Triaxial data): Ysat = 18.5 kN/m3 c) If the elevation of the groundwater table decreased to point B, how would that affect the long-term shear strength of the soil at point A? Quantify your answer. d) Would you recommend including cohesion in the shear strength value used for design? Why or why not?

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