复杂裂隙岩体力学损伤特性与破坏机理分析  

Analysis of Mechanical Damage Characteristics and Failure Mechanism of Complex Fractured Rock Mass

作　　者：张小莉 卢仲鑫 薛晓卫 杨红成 辛顺超[3] 滕振华 Zhang Xiaoli;Lu Zhongxin;Xue Xiaowei;Yang Hongcheng;Xin Shunchao;Teng Zhenhua(Shenzhen Sofore Geotechnical Engineering Co.,Ltd.,Shenzhen 518026,China;Zhengzhou Engineering Co.,Ltd.of China Railway Seventh Group,Zhengzhou 450052,China;China Merchants Chongqing Communications Technology Research and Design Institute Co.,Ltd.,Chongqing 400067,China)

机构地区：[1]深圳市盛业地下工程有限公司,深圳市518026 [2]中铁七局集团郑州工程有限公司,郑州市450052 [3]招商局重庆交通科研设计院有限公司,重庆市400067

出　　处：《北方交通》2021年第9期69-73,共5页Northern Communications

基　　金：中铁七局科技研发项目(19A20)。

摘　　要：针对不同节理状态的岩体受力复杂、力学损伤特性评估困难等问题,采用室内准确预设节理制备试件,模拟不同条件的力学损伤试验,并进行了应力-应变特性、弹性模量和破坏机理分析。结果表明:节理最不利倾角为45°,节理数量越多、贯通度越长、夹层厚度越大,岩体强度越低;0°和90°倾角节理岩体主要是剪切破坏,其余为复合张-剪破坏,破坏过程存在应力积累和集中释放现象。Aiming at the problems of complex stress and difficult evaluation of mechanical damage characteristics of rock mass with different joint states,the specimens are prepared by accurately preset joints in the laboratory,the mechanical damage tests under different conditions are simulated,and the stress-strain characteristics,elastic modulus and failure mechanism are analyzed.The results show that:the most unfavorable dip angle of joint is 45°,the more the number of joints is,the longer the penetration is,the greater the interlayer thickness is,the lower the rock mass strength is;0°and 90°joint rock mass is mainly shear failure,and the rest is composite tension-shear failure.Stress accumulation and concentrated release are shown in the failure process.

关 键 词：复杂裂隙 节理发育 岩体 力学损伤 破坏机理 

分 类 号：TU452[建筑科学—岩土工程]