| 高压力下层间错动带残余强度特性和颗粒破碎试验研究 |
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| 引用本文： | 赵阳,周辉,冯夏庭,邵建富,江权,卢景景,江亚丽,黄可.高压力下层间错动带残余强度特性和颗粒破碎试验研究[J].岩土力学,2012,33(11):3299-3305. |
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| 作者姓名： | 赵阳 周辉 冯夏庭 邵建富 江权 卢景景 江亚丽 黄可 |
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| 作者单位： | 1. 中国科学院武汉岩土力学研究所 岩土力学与工程国家重点试验室，武汉 430071；2. 华北水利水电学院 资源与环境学院，郑州 450011； 3. 法国里尔科技大学 里尔力学试验室，法国，里尔 59655；4. 中国水电顾问集团华东勘测设计研究院，杭州 310014 |
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| 基金项目： | 国家重点基础研究发展计划(973)项目，国家自然科学基金，中国科学院知识创新工程重要方向项目 |
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| 摘 要： | 针对某水电站层间错动带的原状样与重塑样，模拟现场地应力条件，在试验法向应力高达10 MPa条件下开展了反复直剪试验。试验结果表明：原状样峰值强度高于重塑样，但强度下降较快，二者残余强度趋于一致；此外，试样发生了大规模的颗粒破碎，采用颗粒相对破碎势Br量化重塑样剪切面附近区域与非剪切面附近区域颗粒破碎程度，对比发现，前者颗粒破碎程度高于后者，且破碎机制不同；剪切面颗粒破碎是高压力下残余强度包线非线性的根本原因：剪切强度的下降（残余强度与峰值强度的比值）与Br和S2（试验前后小于粒径< 2 µm 颗粒含量的比值）呈线性关系，颗粒破碎导致的能量释放和不断产生的黏粒（< 2 µm）降低了剪切强度。
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| 关 键 词： | 层间错动带 反复直剪 残余强度 高压 颗粒破碎 |
| 收稿时间： | 2011-09-06 |
Residual shear behaviour and particle crushing of an infilled joint soil under high stress |
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| ZHAO Yang
,
ZHOU Hui
,
FENG Xia-ting
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SHAO Jian-fu
,
JIANG Quan
,
LU Jing-jing
,
JIANG Ya-li
,
HUANG Ke.Residual shear behaviour and particle crushing of an infilled joint soil under high stress[J].Rock and Soil Mechanics,2012,33(11):3299-3305. |
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| Authors: | ZHAO Yang ZHOU Hui FENG Xia-ting SHAO Jian-fu JIANG Quan LU Jing-jing JIANG Ya-li HUANG Ke |
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| Institution: | 1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China; 2. School of Resources and Environment, North China Institute of Water Conservancy and Hydroelectric Power, Zhengzhou 450011, China; 3. Laboratory of Mechanics of LILLE, Polytechnique of Lille, Lille 59655, France; 4. HydroChina Huadong Engineering Corporation, Hangzhou 310014, China |
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| Abstract: | Multi-reversal direct shear test is conducted on the undisturbed and remolded infilled joint soils under in-situ stress where normal stress is as far as 10 MPa for test from a hydropower station. It is revealed that the peak shear strength is higher but decreases more rapidly for the undisturbed samples compared with the remolded ones; however, it seems the residual shear strengths tend to be the same. In addition, a large amount of particle crushing occurs, Br (relative particle crushing potential) is adopted to quantify the degree of particle crushing in the shear zone and the non-shear zone. The results show that the amount of particle crushing in the shear zone is larger than that in the non-shear zone; and the mechanisms of particle crushing are different for the two zones. Furthermore, particle crushing is considered as the main reason for the nonlinear relationship of the residual shear strength under high pressure; the decrease of shear strength (ratio of the residual shear strength to the peak shear strength) is linear with Br and S2 (the ratio of clay fraction before test to the one after test for the shear zone). It is indicated that the energy liberation and continuously generated clay fraction caused by particle crushing decrease the shear strength. |
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| Keywords: | infilled joint soil multi-reversal direct shear residual shear strength high pressure particle crushing |
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