双面剪切荷载作用下岩石断裂过程声发射特性研究

doi:10.13722/j.cnki.jrme.2013.1532

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摘要为深入研究双面剪切荷载作用下岩石断裂过程声发射特性，利用自主研发的煤岩双面剪切试验装置及PCI–2型声发射系统，分析砂岩声发射特性随含水率增高声发射特性曲线变化趋势。试验结果表明：砂岩试件在不同含水率条件下，其剪应力随时间变化趋势一致，剪应力达到峰值所需时间随含水率增加呈减少趋势；双面剪切荷载作用下，砂岩的Hit率–时间曲线、累计Hit数–时间曲线均可分为3个阶段，且Hit率峰值滞后于剪应力峰值；砂岩在双面剪切荷载作用下，内部微裂纹萌生、扩展主要始发生于剪应力达到抗剪强度的1/2时，此时砂岩试件处于微破裂稳定发展阶段；砂岩声发射事件幅值由低到高随剪应力增加呈阶梯状分布；砂岩内部微裂纹扩展方式以绕晶而过为主，穿晶破裂为辅。

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关键词 ：岩石力学, 含水率, 双面剪切荷载, 声发射

Abstract：For the further study of acoustic emission characteristics of rock breaking under double shear loading condition，this paper will use independent developed coal rock double shear test device and PCT–2 acoustic emission system to explore the sandstone?s acoustic emission characteristics with the increase of water content. The results show that under different rates of water content the changes of the shear stress are same with the time trend. The time reaching the peak decreased when the rate of water content increased. Under the double shear loading，sandstone Hit rate-time curve and accumulative Hit number-time curve can be divided into three stages，the Hit rate peak lags behind the peak value of the shear stress and the extreme points of Hit rate increased when the rate of water content heightened. Under the double shear loading，the internal micro crack initiated and expended when the shear stress is at the 1/2 of the shear strength. At that time the sandstone is in the steady micro rupture development stage and the expending mode of the internal micro crack is mainly around the crystal and the rupture. The extension of internal micro cracks was mainly around the crystals and the last small passed through them.

Key words： rock mechanics water content double shear loading acoustic emission

引用本文:

许江1，2，刘义鑫1，2，刘婧1，2，程立朝1，2，冯丹1，2. 双面剪切荷载作用下岩石断裂过程声发射特性研究[J]. 岩石力学与工程学报, 2015, 34(s1): 2659-2664.
XU Jiang1，2，LIU Yixin1，2，LIU Jing1，2，CHENG Lichao1，2，FENG Dan1，2. STUDY OF CHARACTERISTICS OF ROCK ACOUSTIC EMISSION FRACTURE PROCESS OF DOUBLE SHEAR LOADING EFFECT. , 2015, 34(s1): 2659-2664.

链接本文:

http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2013.1532 或 http://www.rockmech.org/CN/Y2015/V34/Is1/2659

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