非贯通锯齿裂隙试样单轴压缩力学性质及其破坏模式研究  

Study on mechanical properties and failure modes of non penetrating serrated fracture specimens under uniaxial compression

作　　者：喻迪 王平 江永志[1] 吴欢 曾梓龙 Yu Di;Wang Ping;Jiang Yongzhi;Wu Huan;Zeng Zilong(School of Resources,Environment and Safety Engineering,Hunan University of Science and Technology,Xiangtan 411201,China;Work Safety Key Lab on Prevention and Control of Gas and Roof Disasters for Southern Coal Mines,Xiangtan 411201,China;Hunan Provincial key Laboratory of Safe Mining Techniques of Coal Mines,Hunan University of Science and Technology,Xiangtan 411201,China)

机构地区：[1]湖南科技大学资源环境与安全工程学院,湖南湘潭411201 [2]南方煤矿瓦斯与顶板灾害预防控制安全生产重点实验室,湖南湘潭411201 [3]湖南科技大学煤矿安全开采技术湖南省重点实验室,湖南湘潭411201

出　　处：《能源与环保》2023年第12期41-47,共7页CHINA ENERGY AND ENVIRONMENTAL PROTECTION

基　　金：国家自然科学基金面上项目(52174110,52274119);湖南省科技人才托举工程项目(2022TJ-N06)。

摘　　要：为探究非贯通裂隙在荷载作用下对岩体力学性质以及破坏模式的影响,分别使用细砂、中砂、粗砂和水泥来制作裂隙倾角为0°、30°、45°、60°的类岩体试样,采用RMT-150C岩石力学试验系统进行室内试验,研究了试样力学性质的变化情况,再结合PFC2D颗粒流软件分析试样的破坏模式。结果表明,相较于完整试样,裂隙试样应力应变曲线均呈双峰曲线,当裂隙倾角为60°时,细砂试样最早进入破坏阶段;当裂隙倾角为45°时,中砂与粗砂岩试样曲线变化趋势完全相反;裂隙的存在对试样的峰值应力与弹性模量都有劣化作用,其中对细砂和中砂试样的影响最显著,对粗砂试样影响较小;随着裂隙倾角和试样颗粒增大,裂纹的数量和类型也相对增加,且破坏模式由劈裂型张拉破坏转变为劈裂型剪切破坏。In order to explore the influence of non penetrating fractures on the mechanical properties and failure modes of rock mass under load,in this paper,fine sand,medium sand,coarse sand and cement were used to make rock-like samples with crack dip angles of 0°,30°,45°and 60°respectively.The change of mechanical properties of samples was studied through the indoor test of RMT-150C rock mechanics test system,and the failure mode of the samples was analyzed by PFC2D particle flow software.The results show that compared to the intact specimen,the stress-strain curves of fractured samples are bimodal curves.When the fracture dip angle is 60°,the fine sand samples enter the failure stage at the earliest.When the fracture dip angle is 45°,the curves of medium sandstone and coarse sandstone samples are completely opposite.The existence of fractures has a deterioration effect on the peak stress and elastic modulus of the samples,especially on fine sandstone and medium sandstone samples,but little on coarse sandstone.With the increase of fracture dip angle and sample particles,the number and types of fractures also increase,and the failure mode changes from splitting tensile failure to splitting shear failure.

关 键 词：非贯通裂隙 裂隙倾角 骨料粒径 力学性质 破坏模式 

分 类 号：TU45[建筑科学—岩土工程]