| 不同加载方位角下单轴压缩千枚岩扩容特性 |
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| 引用本文： | 吴永胜,谭忠盛,余贤斌,喻渝,朱勇.不同加载方位角下单轴压缩千枚岩扩容特性[J].岩土力学,2018,39(8):2747-2754. |
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| 作者姓名： | 吴永胜 谭忠盛 余贤斌 喻渝 朱勇 |
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| 作者单位： | 1. 北京交通大学 土木建筑工程学院，北京 100044；2. 昆明理工大学 国土资源工程学院，云南 昆明 650093； 3. 中铁二院工程集团有限公司，四川 成都 610031 |
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| 基金项目： | 铁道部自然科学基金项目资助（No. 2010G018-G-1）。 |
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| 摘 要： | 对成兰铁路4种典型千枚岩开展不同加载方位角的单轴压缩扩容特性试验研究，研究结果表明：千枚岩一般在峰前产生扩容现象，加载方位角和各向异性程度影响其扩容行为。扩容前后纵、横向应变速率明显不同，扩容前轴向应变率大于横向，扩容后则反之；千枚岩体积应变正负转换点相对峰值点有3种出现情况：峰前、峰后和不出现，不同出现概率与加载过程中原生裂纹的参与程度、形式以及对破坏模式的影响有关。千枚岩扩容率最大值出现在轴向应变最大瞬间，高方位角对扩容更敏感；千枚岩扩容起始应力普遍较低，不同方位角和岩性差别较大；弹性模量、泊松比显著地反映了千枚岩加载中的变形破坏过程，扩容对其产生重要影响。
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| 关 键 词： | 千枚岩 扩容 单轴压缩试验 弹性模量 泊松比 |
| 收稿时间： | 2016-10-24 |
Dilatancy behavior of phyllite in uniaxal compressive tests under different loading azimuths |
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| WU Yong-sheng,TAN Zhong-sheng,YU Xian-bin,YU Yu,ZHU Yong.Dilatancy behavior of phyllite in uniaxal compressive tests under different loading azimuths[J].Rock and Soil Mechanics,2018,39(8):2747-2754. |
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| Authors: | WU Yong-sheng TAN Zhong-sheng YU Xian-bin YU Yu ZHU Yong |
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| Institution: | 1. School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China; 2. School of Land and Resources Engineering, Kunming University of Science and Technology, Kunming, Yunnan 650093, China; 3. China Railway Eryuan Engineering Group Co., Ltd., Chengdu, Sichuan 610031, China |
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| Abstract: | Uniaxial compressive tests were carried out to investigate the dilatation behaviour of phyllite samples under different loading azimuths. There were four types of samples taken from the Chengdu-Lanzhou railway. The results showed that the samples generally expanded before the peak stress reached, and the dilatation behaviour was influenced by the loading azimuth and degree of anisotropy. The vertical strain rate was greater than the horizontal one before the dilatation occurred, and vice versa after expansion. When the volumetric strain of phyllite samples converted from a positive value to a negative one, three conditions existed: pre-peak stress, post-peak stress and not-converted. Besides, the probability of the conversion was related to the participation degree, the form, and the failure mode of the original cracks during the loading process. The maximum dilatation rate appeared at the moment when the axial strain reached its maximum value, and the high azimuth angle was more sensitive to the dilatation capacity. The initiation stress of the dilatation was usually low, and the difference between the loading azimuth and lithology was large. The deformation and failure process of phyllite under loading was significantly reflected by the elastic modulus and Poisson ratio which were greatly affected by the dilatancy. |
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| Keywords: | phyllite dilatancy uniaxial compressive test elastic modulus Poisson ratio |
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