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Material properties of the rock are determined from laboratory tests on sample size, which is much smaller than the size of rock mass in the field. Hence, the lab test cannot accommodate some properties and conditions of the in situ rock mass (weathering zones and large-scale discontinuities). As such, most strength tests give a higher strength than the mass strength of rock bodies in the field. Figure 4 shows three samples (S1, S2 and S3) collected from 3 different locations in a rock mass. S2 and S3 are located more than 30 below the ground surface. As can be seen, the rock mass is discontinuous and exhibits various types of weakness planes. Answer the following questions: J1 S₂ 81 J2 S3 g f a) Based on the nature of the samples, state the type of direct strength test should be undertaken on samples S1, S2 and S3.

Material properties of the rock are determined from laboratory tests on sample size, which is much smaller than the size of rock mass in the field. Hence, the lab test cannot accommodate some properties and conditions of the in situ rock mass (weathering zones and large-scale discontinuities). As such, most strength tests give a higher strength than the mass strength of rock bodies in the field. Figure 4 shows three samples (S1, S2 and S3) collected from 3 different locations in a rock mass. S2 and S3 are located more than 30 below the ground surface. As can be seen, the rock mass is discontinuous and exhibits various types of weakness planes. Answer the following questions: J1 S₂ 81 J2 S3 g f a) Based on the nature of the samples, state the type of direct strength test should be undertaken on samples S1, S2 and S3.

Structural Analysis
Structural Analysis
6th Edition
ISBN:9781337630931
Author:KASSIMALI, Aslam.
Publisher:KASSIMALI, Aslam.
Chapter2: Loads On Structures
Section: Chapter Questions
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Material properties of the rock are determined from laboratory tests on sample size, which is much smaller than the size of rock mass in the field. Hence, the lab test cannot accommodate some properties and conditions of the in situ rock mass (weathering zones and large-scale discontinuities). As such, most strength tests give a higher strength than the mass strength of rock bodies in the field. Figure 4 shows three samples (S1, S2 and S3) collected from 3 different locations in a rock mass. S2 and $3 are located more than 30 below the ground surface. As can be seen, the rock mass is discontinuous and exhibits various types of weakness planes. Answer the following questions: J1 81 S3 J2 g f a) Based on the nature of the samples, state the type of direct strength test should be undertaken on samples S1, S2 and S3.
Transcribed Image Text:Material properties of the rock are determined from laboratory tests on sample size, which is much smaller than the size of rock mass in the field. Hence, the lab test cannot accommodate some properties and conditions of the in situ rock mass (weathering zones and large-scale discontinuities). As such, most strength tests give a higher strength than the mass strength of rock bodies in the field. Figure 4 shows three samples (S1, S2 and S3) collected from 3 different locations in a rock mass. S2 and $3 are located more than 30 below the ground surface. As can be seen, the rock mass is discontinuous and exhibits various types of weakness planes. Answer the following questions: J1 81 S3 J2 g f a) Based on the nature of the samples, state the type of direct strength test should be undertaken on samples S1, S2 and S3.
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