Structural Analysis
Structural Analysis
6th Edition
ISBN: 9781337630931
Author: KASSIMALI, Aslam.
Publisher: Cengage,
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Question
1. To evaluate shear strength to be used in stability analysis of a slope, two drained direct shear tests have been performed on samples of a highly overconsolidated clay. One test was carried out on a remolded sample under effective vertical stress of 300 kPa, and a shear strength of 121 kPa was measured. The second test was carried out on a precut sample under effective vertical stress of 300 kPa, and a shear strength of 48 kPa was measured. On the basis of previous field experience with the overconsolidated plastic clay, it is expected that the peak (intact) strength envelope will show a cohesion intercept c' (mob) of 10 kPa for effective normal stress range near 200 kPa. Compute the shear strength to be used on a segment of a slip surface on which the effective normal stress is 200 kPa, if the slip plane passes through: (a) material that is badly fissured and jointed; however, there is no preexisting continuous plane of discontinuity; (b) material that contains a preexisting plane of discontinuity oriented in the direction of global movement; (c) material that according to bore hole records appears to be free of joints and fissures and there is no preexisting plane of discontinuity; and (d) if for condition (b) the factor of safety was equal to 1.2, compute the factor of safety if the porewater pressure at the slip plane increases by 50 kPa e 3:16 /
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Transcribed Image Text:1. To evaluate shear strength to be used in stability analysis of a slope, two drained direct shear tests have been performed on samples of a highly overconsolidated clay. One test was carried out on a remolded sample under effective vertical stress of 300 kPa, and a shear strength of 121 kPa was measured. The second test was carried out on a precut sample under effective vertical stress of 300 kPa, and a shear strength of 48 kPa was measured. On the basis of previous field experience with the overconsolidated plastic clay, it is expected that the peak (intact) strength envelope will show a cohesion intercept c' (mob) of 10 kPa for effective normal stress range near 200 kPa. Compute the shear strength to be used on a segment of a slip surface on which the effective normal stress is 200 kPa, if the slip plane passes through: (a) material that is badly fissured and jointed; however, there is no preexisting continuous plane of discontinuity; (b) material that contains a preexisting plane of discontinuity oriented in the direction of global movement; (c) material that according to bore hole records appears to be free of joints and fissures and there is no preexisting plane of discontinuity; and (d) if for condition (b) the factor of safety was equal to 1.2, compute the factor of safety if the porewater pressure at the slip plane increases by 50 kPa e 3:16 /
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