充填双裂隙砂岩力学特性及裂隙演化规律研究  

Mechanical properties and cracks evolution law of sandstone containing two filled fissures

作　　者：周春煦 冯红春 周文正 ZHOU Chunxu;FENG Hongchun;ZHOU Wenzheng(Department of Naval Architecture and Ocean Engineering,Jiangsu Shipping College,Nantong 226010,Jiangsu,China;Changjiang Institute of Survey,Planning,Design and Research Co.,Ltd.,Wuhan 430010,China;School of Civil Engineering,Southeast University,Nanjing 210096,China)

机构地区：[1]江苏航运职业技术学院船舶与海洋工程系,江苏南通226010 [2]长江勘测规划设计研究有限责任公司,武汉430010 [3]东南大学土木工程学院,南京210096

出　　处：《有色金属科学与工程》2024年第4期577-587,632,共12页Nonferrous Metals Science and Engineering

基　　金：江苏省高职院校教师专业带头人高端研修(个人访学研修)资助项目(2021GRGDYX007);南通市科技计划资助项目(MSZ21096);江苏高校“青蓝工程”优秀青年骨干教师培养资助项目(2020QLGC)。

摘　　要：本文开展三轴压缩不同岩桥参数条件下充填双裂隙红砂岩力学实验,分析了不同岩桥长度、岩桥倾角及充填物类型对砂岩特征应力和裂隙扩展贯穿模式的影响规律,揭示了充填双裂隙砂岩试件破坏模式及内部裂隙发育差异性机理。研究表明:当岩桥长度减小,而岩桥倾角增大时,不同充填物类型条件下充填双裂隙试件特征应力均逐渐减弱。且不同岩桥参数条件下,未充填双裂隙试件弱化程度均大于泥充填双裂隙试件,更大于砂充填双裂隙试件。充填试件贯穿上下端部主裂隙少于未充填试件,但分支数量更多。外载荷会导致泥、砂充填物分层,其层间裂隙最大宽度为50μm。砂晶体颗粒是导致砂充填试件力学特性强于泥充填试件的主要原因。In this paper,the mechanical experiments were conducted on red sandstone containing two filled fissures under different rock bridge parameters by triaxial compression to analyze the influence of the fissures filling types,rock bridge lengths,and rock bridge inclinations on the characteristic stresses of sandstone,as well as the cracks propagation and coalescence modes of red sandstone,revealing the influence mechanism of the filling types on the internal fracture propagation and failure modes of the two filled fissure red sandstone rocks.The results showed that the characteristic stress of the filling double fracture specimens under different filling material types gradually decreased when the length of the rock bridge was smaller,and the inclination angle of the rock bridge was larger.Additionally,under different conditions of rock bridge parameters,the weakening degree of unfilled double-fissure specimens was greater than that of mud-filled ones and much greater than that of sandfilled ones.The number of main fissures through the upper and lower ends of the filled specimen was fewer than that of the unfilled one,but with a greater number of branch fractures.The external load caused the delamination of the mud and sandstone fillings, with the maximum width of interlayer fissures reaching 50 μm. Sand crystalparticles are the main reason why the mechanical properties of sandstone sand-filling specimens are stronger thanthose of mud-filling ones.

关 键 词：充填裂隙 岩桥参数 特征应力 破坏模式 裂隙扩展 

分 类 号：TD353[矿业工程—矿井建设]