Principles of Foundation Engineering (MindTap Course List)
9th Edition
ISBN: 9781337705028
Author: Braja M. Das, Nagaratnam Sivakugan
Publisher: Cengage Learning
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Chapter 7, Problem 7.17P
To determine
Find the cohesion of the specimen.
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A sandstone rock specimen has quc= 50 MN/m2 and ∅' =35°. Find c'.
this is a rock mechanics class
1. Triaxial compression tests are done on quartzite rocks, the results are shown below.
(0₁+03)/2 -964.25 14500 19575 23200 29000 43210 63075 psi
(01-03)/2 964.25 14500 18850 21750 26100 35960 48575 psi
Comment on the applicability of each of the Mohr-Coulomb, Griffith, and Hoek-Brown criteria for the
testing results.
Chapter 7 Solutions
Principles of Foundation Engineering (MindTap Course List)
Ch. 7 - A 7.5 ft wide rough continuous foundation is...Ch. 7 - In Problem 7.1, if there was no bedrock present...Ch. 7 - A 1.5 m × 2.0 m rectangular foundation is placed...Ch. 7 - In Problem 7.3, if no bedrock was present for at...Ch. 7 - Prob. 7.6PCh. 7 - Redo Problem 7.6 using Vesic’s (1975) solution...Ch. 7 - Prob. 7.8PCh. 7 - Prob. 7.9PCh. 7 - A continuous foundation having a width of 1.5 m is...Ch. 7 - A 2 m wide continuous foundation is to be placed...
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- Problems 1. In a series of triaxial compression tests on a sandstone, the following repre- sent the stresses at peak load conditions: Test 1 2 3 4 σ3 (MPa) 1.0 5.0 9.5 15.0 σ₁ (MPa) 9.2 28.0 48.7 74.0 Determine values of S; and that best fit the data. 2. The initial state of stress at a point in the ground, in sandstone of Problem 1, is σ3 = 1300 psi σ₁ = 5000 psi The pore water pressure (p.) will be raised by the construction of a reservoir. What value of p will cause fracture of the sandstone in situ (assume fracture occurs at peak stress). 3. For the rock of Problems 1 and 2, what is the value of the principal stress ratio (03/0₁) above which "failure" cannot occur?arrow_forwardWhat is the rating of the rock under " Strength of Intact Rock Material" parameter? A 7 B 15 C) 12 (D) 1arrow_forwardDetermine shear strength of clay having value of cohesion 31 KPa Normal stress 100 KPa and angle of internal is 31 degreearrow_forward
- Solve itarrow_forward1. In a series of triaxial compression tests on a sandstone, the following repre- sent the stresses at peak load conditions: Test o3(MPa) o (MPa) 1 1.0 5.0 9.5 15.0 9.2 28.0 3 48.7 4 74.0 Determine values of S; and o that best fit the data.arrow_forwardDescribe brittle and dilative behaviour of rock. Show both behaviours with typical stress-strain curves.arrow_forward
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