文献类型：期刊文献

中文题名：干燥与饱和岩石裂隙受压变形与声发射特性研究

英文题名：Deformation and acoustic emission characteristics of dry and saturated rock fractures

作者：李博[1,2];叶鹏进[1];黄林[2];王丁[1];赵程[2];邹良超[3]

机构：[1]绍兴文理学院岩石力学与地质灾害浙江省重点实验室,浙江绍兴312000;[2]同济大学地下建筑与工程系,上海200092;[3]瑞典皇家理工学院可持续发展与环境工程系,斯德哥尔摩SE-10044,瑞典

年份：2021

卷号：43

期号：12

起止页码：2249

中文期刊名：岩土工程学报

外文期刊名：Chinese Journal of Geotechnical Engineering

收录：CSTPCD、、CSCD2021_2022、EI(收录号：20215011328198)、Scopus、北大核心、CSCD、北大核心2020

基金：浙江省自然科学基金项目(LR19E090001);国家自然科学基金项目(42077252,41804127)。

语种：中文

中文关键词：岩石裂隙;变形;弹塑性接触;声发射;法向应力

外文关键词：rock fracture;deformation;elastic-plastic contact;acoustic emission;normal stress

中文摘要：天然岩体处于各类复杂的地质环境中,定量描述岩石裂隙在各种条件下的变形破坏行为是开展各类与岩石裂隙力学特性相关研究的基础。通过单轴压缩试验和弹塑性接触数值计算研究了两种具有不同岩性的岩石裂隙在干燥与饱和状态下的受压变形破坏行为,并对试验过程中的声发射信号进行了采集分析。结果表明:试验与数值计算得到的法向应力–位移曲线和塑性破坏区域皆基本吻合,验证了弹塑性接触计算方法的可靠性;塑性变形均值增量up随法向应力σn的增长呈现变化速率降低的非线性减小关系,利用力学及几何参数建立的拟合公式可较好地预测该关系;声发射源位置与试验及数值模拟得到的损伤破坏区域基本匹配,干燥状态下两种岩石声发射振铃计数、累计计数均高于饱和状态;声发射振铃计数与塑性变形均值增量的变化趋势基本一致。研究结果定量地揭示了岩石基本力学参数和裂隙表面特征对其受压变形破坏行为的控制作用。

外文摘要：The natural rock masses are situated in various complex geological conditions.Quantitative description of the deformation and failure behaviors of rock fractures under these conditions is of fundamental importance for the studies related to their mechanical behaviors.In this study,the unconfined compression tests and the elastic-plastic contact numerical simulations are implemented to study the compressive deformation and failure behavior of two kinds of rock fractures under dry and saturated conditions,together with acoustic emission detection and analysis.The results show that the normal stress-displacement curves and the plastic failure areas obtained from the experiment and the numerical simulation agree well with each other,which verifies the reliability of the contact method.The mean increment of plastic deformation decreases nonlinearly with the increasing normal stress with a decreasing rate,and a fitting formula is established using mechanical and geometric parameters.The position of acoustic emission(AE)sources matches with the damage area obtained from the experiment and the numerical simulation.Both the AE ringing count and the cumulative count are higher in dry rocks than those in saturated rocks.The AE ringing count and the mean increment of plastic deformation follow an identical changing trend.These results reveal the controlling role played by the fundamental mechanical parameters and geometric properties in the deformation and failure behaviors of rock fractures.