云母石英片岩强度的各向异性特征研究  

Investigation of the Anisotropic Behavior of Mica Quartz Schist

作　　者：王哲[1] 马淑芝[2] 席人双[1] 贾洪彪[2] WANG Zhe;MA Shuzhi;XI Renshuang;JIA Hongbiao(China Railway SIYUAN Survey&Design Group Co.,Ltd.,Wuhan 430063,China;Faculty of Engineering,China University of Geosciences,Wuhan 430074,China)

机构地区：[1]中铁第四勘察设计院集团有限公司,湖北武汉430063 [2]中国地质大学(武汉)工程学院,湖北武汉430074

出　　处：《安全与环境工程》2018年第2期160-165,共6页Safety and Environmental Engineering

基　　金：福建海西高速公路网厦沙线石英片岩高边坡变形破坏机制及加固方案研究项目(KH126258)

摘　　要：通过对厦沙高速公路边坡云母石英片岩的矿物成分、微观结构、强度测试以及数值模拟分析,研究了不同风化程度的云母石英片岩在结构和强度上的各向异性特征,分析了云母石英片岩强度的变化规律。结果表明:在漫长地质历史过程中经历多种地质作用,云母石英片岩的矿物形成了独特的定向排列结构,使岩石具有明显的片状构造,从而也导致岩石在物理力学性质上具有明显的各向异性;在不同方向荷载作用下,云母石英片岩的抗压强度和剪切强度均表现出一定的各向异性,尤其是抗剪强度更为明显,反映出片理面对于其剪切破坏的控制作用更为强烈;不同风化程度的云母石英片岩的抗压强度均具有明显的各向异性,随片理面倾角的变化,其抗压强度呈"U"字形的变化趋势,表现为先减小后增大,且随岩石风化程度的加深,"U"字形曲线越来越开敞,云母石英片岩的抗压强度的各向异性程度有所减弱。This paper presents an experimental study on the anisotropic behavior of the microstructure and strength of mica quartz schist,in which mineral composition analysis,microstructure analysis,strength test and numerical analysis are undertaken.The results obtained in the study indicate that the mica quartz schist exhibits significant anisotropic behavior,especially in the shear strength,which could be attributed to the following aspects:the mineral composition of the mica quartz schist tends to be uniquely oriented due to the long geological process(e.g.,the flake structure of mica quartz schist is usually observed in the field),and the oriented structure can lead to the anisotropic behavior of the physical and mechanical properties.The relationship between the compressive strength and the inclination angle can be captured by a U-shape function:the compressive strength decreases first and then increases with the inclination angle.Meanwhile,the anisotropic behavior of the mica quartz schist can be influenced by the degree of weathering.For example,with the increasement of the weathering degree,the curvature of the U-shape function would decrease and the degree of the anisotropic behavior of compressive strength would be degraded.

关 键 词：云母石英片岩 风化程度 强度 各向异性 微观结构 片理 

分 类 号：X948[环境科学与工程—安全科学] U416.14[交通运输工程—道路与铁道工程]