| 水对岩石亚临界裂纹扩展及门槛值的影响研究 |
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| 引用本文： | 万琳辉,曹平,黄永恒,汪亦显.水对岩石亚临界裂纹扩展及门槛值的影响研究[J].岩土力学,2010,31(9):2737-2742. |
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| 作者姓名： | 万琳辉 曹平 黄永恒 汪亦显 |
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| 作者单位： | 中南大学 资源与安全工程学院，长沙 410083 |
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| 基金项目： | 国家自然科学基金资助项目，中南人学学位创新课题，湖南省安监局资助项目 |
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| 摘 要： | 亚临界裂纹扩展是岩体工程时间相依性的主要原因之一。采用常位移松弛法，对饱水和干燥两种状态下的大理岩、花岗岩双扭试件进行了亚临界裂纹扩展试验研究，获得了两种岩石在两种状态下的亚临界裂纹扩展速率V与应力强度因子 的关系，分析了两种岩石在两种状态下亚临界裂纹扩展的规律，并确定了两种岩石在两种状态下的门槛值（干燥状态）：大理岩 为1.365，花岗岩 为2.305；（饱水状态）：大理岩 为1.118，花岗岩 为1.490。研究表明，两种岩石的 与 关系有较好的线性规律, 但由于岩石本身矿物成分等的不均匀性，同种岩石的 与 关系离散性较大，饱水状态下离散性更大；水能加速岩石亚临界裂纹的扩展，且对不同的岩石，其影响程度也不一样；水可以使岩石亚临界裂纹扩展的门槛值有较大幅度降低，不同岩石其降低的程度也不一样。
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| 关 键 词： | 常位移松弛 双扭试件 亚临界裂纹扩展 水影响 与 关系 门槛值 |
| 收稿时间： | 2009-03-16 |
Study of subcritical crack growth of rocks and threshold values in different environments |
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| WAN Lin-hui,CAO Ping,HUANG Yong-heng,WANG Yi-xian.Study of subcritical crack growth of rocks and threshold values in different environments[J].Rock and Soil Mechanics,2010,31(9):2737-2742. |
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| Authors: | WAN Lin-hui CAO Ping HUANG Yong-heng WANG Yi-xian |
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| Institution: | School of Resources and Safety Engineering, Central South University, Changsha 410083, China |
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| Abstract: | Subcritical crack growth is one of the main causes of time-dependent behavior in rocks. Applied the constant displacement relaxation method, subcritical crack growth in specimens made of marble and granite which were in dry and water-saturated environments was studied in double torsion test. The relations of the stress intensity factor versus the subcritical crack growth velocity V were obtained under the two different environments. The behavior of subcritical crack growth was analyzed. The threshold values of subcritical crack growth in rocks were obtained under the two different environments —— dry environment: marble =1.365, granite =2.305; water-saturated environment: marble =1.118, granite =1.490. The results showed: the relations between and accorded with linear rules; but it were discrete because of inhomogenous mineral composition, etc, it was more discrete under water-saturated environment; water can accelerate the subcritical crack growth; the effect degree was different in different rocks; the threshold values were reduced by water; the reduction was different in different rocks. |
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| Keywords: | constant displacement relaxation double torsion specimen subcritical crack growth effects of water relations between and threshold values |
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