Shear Mechanical Behaviours and Multistrength Parameter Characteristics of Fault Gouge
Fault gouge has special mechanical properties and remarkable engineering effects. Using a ring shear test, the strength properties of the differently colored remolded fault gouges of the Shendaogou Fault in Yan’an were studied by changing moisture contents and normal stresses. Chlorite and illite ar...
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| Format: | Article |
| Language: | English |
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Wiley
2019-01-01
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| Series: | Advances in Civil Engineering |
| Online Access: | http://dx.doi.org/10.1155/2019/4208032 |
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| author | Han Bao Qun Qi Hengxing Lan Changgen Yan Wei Xu Xin Liu Langping Li |
| author_facet | Han Bao Qun Qi Hengxing Lan Changgen Yan Wei Xu Xin Liu Langping Li |
| author_sort | Han Bao |
| collection | DOAJ |
| description | Fault gouge has special mechanical properties and remarkable engineering effects. Using a ring shear test, the strength properties of the differently colored remolded fault gouges of the Shendaogou Fault in Yan’an were studied by changing moisture contents and normal stresses. Chlorite and illite are the main clay minerals in fault gouges; differences in mineral composition make fault gouges appear in different colors. Besides clay minerals, the dried fault gouges disintegration in water is also due to the transformation of gypsum. The gradation of green fault gouge and multicolor fault gouge is better than that of the red fault gouge, while the fault gouges’ strain softening properties become weaker as the coarse grain content increases. Affected by water content and normal stress, the shear planes can be divided into three failure modes: peeling failure, grooved failure, and sliding failure. With the increase of water content, there will be a significant weakening on cohesion and friction angle. A new parameter, the “Normal Stress Threshold (NST),” is introduced as a critical value for the emergence of the strain hardening phenomenon, and the NSTs of different fault gouges are significantly different. The functions obtained from the relation of residual strength, peak strength, and normal stress can be used to calculate shear strength parameters under any normal stresses. In addition, the residual strength of fault gouge is obviously different from clay and loess, which can be qualitatively explained by clay particle contents. |
| format | Article |
| id | doaj-art-69e76011d4ac487cb9527c662d073a17 |
| institution | Kabale University |
| issn | 1687-8086 1687-8094 |
| language | English |
| publishDate | 2019-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in Civil Engineering |
| spelling | doaj-art-69e76011d4ac487cb9527c662d073a172025-02-03T05:53:30ZengWileyAdvances in Civil Engineering1687-80861687-80942019-01-01201910.1155/2019/42080324208032Shear Mechanical Behaviours and Multistrength Parameter Characteristics of Fault GougeHan Bao0Qun Qi1Hengxing Lan2Changgen Yan3Wei Xu4Xin Liu5Langping Li6School of Highway, Chang’an University, Xi’an, Shaanxi 710064, ChinaSchool of Highway, Chang’an University, Xi’an, Shaanxi 710064, ChinaState Key Laboratory of Resources and Environmental Information System, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, ChinaSchool of Highway, Chang’an University, Xi’an, Shaanxi 710064, ChinaSchool of Highway, Chang’an University, Xi’an, Shaanxi 710064, ChinaSchool of Geological Engineering and Geomatics, Chang’an University, Xi’an, Shaanxi 710064, ChinaState Key Laboratory of Resources and Environmental Information System, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, ChinaFault gouge has special mechanical properties and remarkable engineering effects. Using a ring shear test, the strength properties of the differently colored remolded fault gouges of the Shendaogou Fault in Yan’an were studied by changing moisture contents and normal stresses. Chlorite and illite are the main clay minerals in fault gouges; differences in mineral composition make fault gouges appear in different colors. Besides clay minerals, the dried fault gouges disintegration in water is also due to the transformation of gypsum. The gradation of green fault gouge and multicolor fault gouge is better than that of the red fault gouge, while the fault gouges’ strain softening properties become weaker as the coarse grain content increases. Affected by water content and normal stress, the shear planes can be divided into three failure modes: peeling failure, grooved failure, and sliding failure. With the increase of water content, there will be a significant weakening on cohesion and friction angle. A new parameter, the “Normal Stress Threshold (NST),” is introduced as a critical value for the emergence of the strain hardening phenomenon, and the NSTs of different fault gouges are significantly different. The functions obtained from the relation of residual strength, peak strength, and normal stress can be used to calculate shear strength parameters under any normal stresses. In addition, the residual strength of fault gouge is obviously different from clay and loess, which can be qualitatively explained by clay particle contents.http://dx.doi.org/10.1155/2019/4208032 |
| spellingShingle | Han Bao Qun Qi Hengxing Lan Changgen Yan Wei Xu Xin Liu Langping Li Shear Mechanical Behaviours and Multistrength Parameter Characteristics of Fault Gouge Advances in Civil Engineering |
| title | Shear Mechanical Behaviours and Multistrength Parameter Characteristics of Fault Gouge |
| title_full | Shear Mechanical Behaviours and Multistrength Parameter Characteristics of Fault Gouge |
| title_fullStr | Shear Mechanical Behaviours and Multistrength Parameter Characteristics of Fault Gouge |
| title_full_unstemmed | Shear Mechanical Behaviours and Multistrength Parameter Characteristics of Fault Gouge |
| title_short | Shear Mechanical Behaviours and Multistrength Parameter Characteristics of Fault Gouge |
| title_sort | shear mechanical behaviours and multistrength parameter characteristics of fault gouge |
| url | http://dx.doi.org/10.1155/2019/4208032 |
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