| 石灰岩裂隙摩擦滑动特性试验研究 |
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| 引用本文： | 钟 振,胡云进.石灰岩裂隙摩擦滑动特性试验研究[J].岩土力学,2015,36(11):3085-3093. |
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| 作者姓名： | 钟 振 胡云进 |
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| 作者单位： | 1. 绍兴文理学院 土木工程学院，浙江 绍兴 312000；2. 美国宾夕法尼亚州立大学 岩石力学实验室，宾夕法尼亚 16802-5000； 3. 绍兴文理学院 岩石力学与地质灾害实验中心，浙江 绍兴 312000 |
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| 基金项目： | 国家自然科学基金项目（No.51279177）；浙江省公益性技术应用研究计划资助项目（No.2015C31134）；绍兴文理学院科研启动项目（No.20145016, No.20145014）。 |
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| 摘 要： | 为研究石灰岩裂隙的摩擦滑动特性,搭建了三轴试验系统,进行了劈裂石灰岩岩芯在湿润和干燥条件下的滑动-控制-滑动试验、速度步长试验和渗透试验。通过滑动-控制-滑动试验和速度步长试验分别研究了石灰岩裂隙摩擦强度的时间依赖性和滑动稳定性,并进一步分析了水对裂隙摩擦强度特性的影响,同时还通过渗透试验观察了裂隙渗透率在滑动过程中的变化。滑动-控制-滑动试验表明:裂隙的摩擦强度具有时间和应力依赖性,裂隙摩擦强度在控制时间内的下降量及重新滑动后的愈合量均与控制时长成正比,而与有效压应力成反比;此外,摩擦强度特性还明显受到水的影响。速度步长试验则表明:石灰岩裂隙摩擦强度随滑动速度的增加而增大,呈现速度强化特性。最后通过不同有效正应力下(介于1?3 MPa之间)的渗透试验发现:裂隙的渗透率不仅随有效应力的增加而急剧下降,而且在各级正应力下亦随滑动而逐渐减小。
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| 关 键 词： | 劈裂石灰岩岩芯 摩擦滑动特性 摩擦强度 时间依赖性 滑动稳定性 渗透率 |
| 收稿时间： | 2014-07-14 |
Experimental study of frictional sliding behavior of limestone fracture |
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| ZHONG Zhen,HU Yun-jin.Experimental study of frictional sliding behavior of limestone fracture[J].Rock and Soil Mechanics,2015,36(11):3085-3093. |
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| Authors: | ZHONG Zhen HU Yun-jin |
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| Institution: | 1. School of Civil Engineering, Shaoxing University, Shaoxing, Zhejiang 312000, China; 2. Rock Mechanics Laboratory, The Pennsylvania State University, Pennsylvania 16802-5000, USA; 3. Centre of Rock Mechanics and Geological Disaster, Shaoxing University, Shaoxing, Zhejiang 312000, China |
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| Abstract: | In this paper, a triaxial experimental apparatus is developed to investigate the frictional sliding behavior of fissures in limestone. Slide-hold-slide (SHS) tests, velocity stepping (VS) tests and permeability tests are conducted on the limestone core samples under both dry and wet conditions. Time-dependence and sliding stability are firstly studied through SHS tests and VS tests, respectively, and then the effect of water on the frictional behavior of fissures is further analyzed. Meanwhile, the permeability of fissures is measured during the sliding process in permeability tests. SHS tests show that frictional strength of fissures exhibits significant time- and stress- dependent behavior. The decreasing magnitude of frictional strength at the controlled time and the healing magnitude after re-sliding are proportional to the controlled time intervals, but inversely proportional to the effective confining stress. In addition, the frictional behavior is obviously influenced by water. However, VS tests demonstrate that frictional strength of limestone increases with increasing sliding velocities, which indicates the velocity-strengthening behavior. Finally, it can be seen from a series of permeability tests under varied effective normal stresses from 1 to 3 MPa is carried out, the permeability declines sharply with the increase of effective confining stress, and even decreases gradually with sliding process at each level of effective confining stress. |
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| Keywords: | split limestone core frictional sliding behavior frictional strength time-dependent behavior sliding stability permeability |
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