| 水压影响岩石渐进破裂过程的试验研究 |
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| 引用本文： | 彭俊,荣冠,周创兵,王小江,侯迪.水压影响岩石渐进破裂过程的试验研究[J].岩土力学,2013,34(4):941-946. |
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| 作者姓名： | 彭俊 荣冠 周创兵 王小江 侯迪 |
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| 作者单位： | 1.武汉大学 水资源与水电工程科学国家重点实验室，武汉 430072；2.武汉大学 水工岩石力学教育部重点实验室，武汉 430072 |
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| 基金项目： | 国家973项目资助（No. 2011CB013501，No. 2010CB732005）；国家自然科学基金资助（No. 50979081）；新世纪优秀人才计划项目资助（No. NCET-11-0406）；中央高校基本科研业务费专项资金资助（No. 2012206020215）。 |
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| 摘 要： | 岩石的压缩过程伴随着裂纹扩展，在低、中围压条件下扩展的裂纹主要受到张拉作用而产生，张拉破坏是首要的作用机制。研究发现，岩石的渐进破裂过程受岩石的结构和构造影响，比如矿物成分、颗粒大小以及胶结情况等，另外，围压以及开挖扰动等外界因素对岩石的渐进破裂过程也有重要影响。基于试验方法探讨水压对岩石渐进破坏过程的影响，首先，阐述岩石渐进破裂过程各个阶段的特征；然后，对岩石渐进破裂指标--岩石的启裂强度 和损伤强度 的确定方法进行总结；最后，选取细粒的石英砂岩为研究对象，通过试验研究水压对岩石渐进破坏过程的影响。试验结果表明，相同围压条件下，随着岩样两端水压的增大，岩石的 有逐渐增大的趋势，而岩石的 和峰值强度 逐渐变小；随着围压逐渐增大，岩石的启裂强度 、损伤强度 及峰值强度 均逐渐增大。
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| 关 键 词： | 水压 岩石渐进破裂 裂纹扩展 启裂强度 损伤强度 |
| 收稿时间： | 2012-05-03 |
Experimental study of effect of water pressure on progressive failure process of rocks under compression |
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| PENG Jun,RONG Guan,ZHOU Chuang-bing,WANG Xiao-jiang,HOU Di.Experimental study of effect of water pressure on progressive failure process of rocks under compression[J].Rock and Soil Mechanics,2013,34(4):941-946. |
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| Authors: | PENG Jun RONG Guan ZHOU Chuang-bing WANG Xiao-jiang HOU Di |
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| Institution: | 1. State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, China; 2. Key Laboratory of Rock Mechanics in Hydraulic Structural Engineering of Ministry of Education, Wuhan University, Wuhan 430072, China |
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| Abstract: | Crack propagation under compression of rocks and cracks in the rock are mainly tensile. Shear band can be formed as the result of interaction of tensile cracks; and shear failure finally occurs with propagation and interaction of cracks in the rock. It has been found that progressive failure process of rocks is affected by mineralogical composition, grain size, texture and foliation, etc. External factors such as the confining pressure and excavation disturbance also have great effect on progressive failure process of rocks. The influence of water pressure on crack propagation of sandstone is studied. Feature of each stage in progressive failure process of sandstone is researched; and stress thresholds-crack initiation stress and crack damage stress are summarized. Then the influence of water pressure on progressive failure process of sandstone is studied experimentally. It is indicated that with increase of water pressure at both ends of the rock sample, crack initiation stress has a tendency to increase and crack damage stress and peak stress decrease gradually. With increase of the confining pressure, stress thresholds during progressive failure process of sandstone decrease gradually. |
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| Keywords: | water pressure progressive failure of rocks crack propagation crack initiation strength damage strength |
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