Shear Strength of Rock with Different Joints under Cyclic Loading
碩士 === 國立臺灣海洋大學 === 河海工程學系 === 104 === The major factors influencing the shear strength degradation of rock joints are friction angle, roughness and compression strength. By performing cyclic shear tests, shear strength degradation affected by sawtooth under different conditions are studied. Ac...
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ndltd-TW-104NTOU51920422017-10-01T04:30:12Z http://ndltd.ncl.edu.tw/handle/20465065939458980839 Shear Strength of Rock with Different Joints under Cyclic Loading 不同節理條件下岩石反覆載重之剪力強度 Liu, Tsung-Wei 劉宗瑋 碩士 國立臺灣海洋大學 河海工程學系 104 The major factors influencing the shear strength degradation of rock joints are friction angle, roughness and compression strength. By performing cyclic shear tests, shear strength degradation affected by sawtooth under different conditions are studied. According to Plasha (1987), natural joint can be simplified by the triangular sawtooth. Reqular and irregular triangular sawtooth were further modified by Kodikara et al.(1994). Material used in the model is plaster with water-cement ratio of 0.35, 0.5 and cement with water-cement ratio of 0.14, 0.2. Based on test results, the following conclusions are given: (1) The sawtooth wearing or destructing makes shear strength to drop fast. (2) The dilatancy angle is related to the damage degree of sawtooth, and the shear strength has the same trend as dilatancy angle. (3) Sawtooth damage increases as sawtooth angle increases, resulting in the decrease of residual strength after cyclic shear; (4) More sawtooth damage occurs under high normal stress; (5) Under lower normal stress, cyclic shear strength is dominated by sawtooth shape; while under high normal strength, cyclic shear strength is dominated by joint compressive strength. Chern, Shuh-Gi 陳俶季 2016 學位論文 ; thesis 81 zh-TW |
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碩士 === 國立臺灣海洋大學 === 河海工程學系 === 104 === The major factors influencing the shear strength degradation of rock joints are friction angle, roughness and compression strength. By performing cyclic shear tests, shear strength degradation affected by sawtooth under different conditions are studied.
According to Plasha (1987), natural joint can be simplified by the triangular sawtooth. Reqular and irregular triangular sawtooth were further modified by Kodikara et al.(1994). Material used in the model is plaster with water-cement ratio of 0.35, 0.5 and cement with water-cement ratio of 0.14, 0.2.
Based on test results, the following conclusions are given: (1) The sawtooth wearing or destructing makes shear strength to drop fast. (2) The dilatancy angle is related to the damage degree of sawtooth, and the shear strength has the same trend as dilatancy angle. (3) Sawtooth damage increases as sawtooth angle increases, resulting in the decrease of residual strength after cyclic shear; (4) More sawtooth damage occurs under high normal stress; (5) Under lower normal stress, cyclic shear strength is dominated by sawtooth shape; while under high normal strength, cyclic shear strength is dominated by joint compressive strength.
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author2 |
Chern, Shuh-Gi |
author_facet |
Chern, Shuh-Gi Liu, Tsung-Wei 劉宗瑋 |
author |
Liu, Tsung-Wei 劉宗瑋 |
spellingShingle |
Liu, Tsung-Wei 劉宗瑋 Shear Strength of Rock with Different Joints under Cyclic Loading |
author_sort |
Liu, Tsung-Wei |
title |
Shear Strength of Rock with Different Joints under Cyclic Loading |
title_short |
Shear Strength of Rock with Different Joints under Cyclic Loading |
title_full |
Shear Strength of Rock with Different Joints under Cyclic Loading |
title_fullStr |
Shear Strength of Rock with Different Joints under Cyclic Loading |
title_full_unstemmed |
Shear Strength of Rock with Different Joints under Cyclic Loading |
title_sort |
shear strength of rock with different joints under cyclic loading |
publishDate |
2016 |
url |
http://ndltd.ncl.edu.tw/handle/20465065939458980839 |
work_keys_str_mv |
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