摘要
针对断裂构造带中断裂核部和裂隙破碎带的内在结构高度非均一性和渗透特性的强烈变异性难以表征和确定的难题,通过显微观察、粒度特征、孔隙特征、原位钻孔压水试验和室内渗透试验,研究了北山断裂带不同构造单元渗透特性和内在结构特征的关系。研究结果表明:十月井断层核部发育有断层泥,并可见构造错动结构面,室内渗透试验表明断层泥渗透系数约在(2~5)×10^(-11)m·s^(-1),未发现断层泥垂向和侧向的渗透特性各向异性;借助于三维精细探槽,对十月井断层破碎带和F4断裂带的结构和地质成因进行了描述;钻孔压水试验获得十月井断层核部破裂带渗透系数范围为1.32×10^(-5)m·s^(-1)到1.94×10^(-5)m·s^(-1)区间内,芨芨槽F4断层核部岩体渗透系数一般大于2.4×10-6m·s^(-1);十月井断层破裂带样品室内渗透试验表明断裂损伤带的渗透系数大体处于10-9~10-6m·s^(-1)之间,其P-Q曲线表现为典型的层流型、充填型、冲蚀性,样品渗透能力随其包含裂隙数量的增加而增大。
It is difficult to characterize and determine the high heterogeneity of the internal structure and the strong variability of permeability in the fracture core and fracture fracture zone in the fault tectonic zone.The relationship between the permeability and internal structural characteristics of different structural units in Beishan fault zone was studied by observing the microscopic structure,grain size characteristics,pore characteristics,in-situ water pressure test and laboratory penetration test.The research results show that:It is concluded that fault gouge is developed in the fault core,and the structural plane of structural dislocation can be seen in the fault core of Shiyuejing.The laboratory permeability test shows that the permeability coefficient of fault gouge is about 2×10^(-1)1~5×10^(-11)m·s^(-1).No anisotropy of the vertical and lateral permeability characteristics of fault gouge is found.The structure and geological origin of the Shiyuejing fault fracture zone and F4fault zone are described with the method of three-dimensional fine trough.According to the borehole water pressure test,the permeability coefficient range of the core fracture zone of Shiyuejing is 1.32×10^(-5)m·s^(-1)to 1.94×10^(-5)m·s^(-1),and the permeability coefficient in the core of the F4 fault is generally greater than 2.4×10-6m·s^(-1).Laboratory permeability tests of the samples in the Shiyuejing fault zone show that the permeability coefficient of the fracture damage zone is generally between 10-9~10-6m·s^(-1),and its P-Q curves show typical laminar flow type,filling type and erosion property.The permeability capacity of the sample increases with the increase of the number of fractures contained in the zone.
作者
邓龙传
李晓昭
吴云
王迎超
黄震
刘江峰
DENG Longchuan;LI Xiaozhao;WU Yun;WANG Yingchao;HUANG Zhen;LIU Jiangfeng(School of Earth Sciences and Engineering,Nanjing University,Nanjing 210023,China;State Key Laboratory for Geomechanics and Deep Underground Engineering,China University of Mining and Technology,Xuzhou 221116,China;School of Resources and Environment Engineering,Jiangxi University of Science and Technology,Ganzhou 341000,China)
出处
《工程地质学报》
CSCD
北大核心
2021年第1期77-85,共9页
Journal of Engineering Geology
基金
南京大学博士生创新创意研究计划项目(资助号:XCXY-19-62)。
关键词
结构面
控水机制
北山
不同尺度
导水特征
Structural plane
Water control mechanism
Beishan
Different scales
Hydraulic characteristics
