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作 者:高勤运[1] GAO Qinyun(China Railway First Survey&Design Institute Group Co.Ltd.,Xi’an 710043)
机构地区:[1]中铁第一勘察设计院集团有限公司,西安710043
出 处:《土工基础》2024年第5期825-827,831,共4页Soil Engineering and Foundation
摘 要:针对木寨岭隧道二叠系板岩夹炭质板岩的大变形问题,通过掌子面素描、磨片鉴定、X射线检测、电镜扫描、点荷载强度测试及大剪试验等手段,详细研究了板岩夹炭质板岩的宏、微观结构和工程力学性质,探析其产生大变形的内在原因,加深对挤压性围岩的判析和认知。研究表明:(1)板岩、炭质板岩由变余碎屑物、泥炭质、绢云母组成,矿物颗粒在较为强烈定向应力作用下,形成“层流结构”,各向异性显著;(2)岩体完整性较差,强度低,变形破坏形式以弯曲、塑性流动为主;(3)为高地应力~弱膨胀复合型软岩,属较典型挤压性围岩。To evaluate the large deformation of the Permian age slate interbedded with carbonaceous slate in Muzhailing Tunnel,the bedrock,rock mass characteristics and engineering mechanical properties of the slate interbedded with the carbonaceous slate are analyzed and studied in detail by means of tunnel face sketch,grinding plate identification,X-ray diffraction,electrical microscope scanning,point load strength index test and large shear tests.The internal cause of the large deformation is also investigated.Meanwhile,the analysis and the understanding of the squeezing bedrock are performed.The conclusions are as follows:(1)the slate and the carbonaceous slate are composed of variable residual debris,peat and sericite,and the mineral particles form a“laminar flow structure”under the strong directional stress,with the remarkable anisotropy;(2)the integrity of the rock mass is poor and the shear strength is low;the main type of the deformation and the fracture are bending and plastic flow;(3)it is a high geostressweak expansion composite in the soft rock mass,which is a typical squeezing bedrock mass.
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