断层影响带渗透特性演化规律与实测方法研究  

Study on the evolution law and test method of the permeability characteristics of a fault-influenced zone

作　　者：张培兴 李晓昭[2,3] 章杨松[4] 刘帅[5] 吴云 周圣骞 ZHANG Peixing;LI Xiaozhao;ZHANG Yangsong;LIU Shuai;WU Yun;ZHOU Shengqian(College of Management Science&Engineering,Hebei University of Economics and Business,Shijiazhuang 050061,Hebei,China;School of Earth Sciences and Engineering,Nanjing University,Nanjing 210046,Jiangsu,China;Institute for Underground space and Geoenvironment,Nanjing University,Nanjing 210046,Jiangsu,China;Department of Civil Engineering,Nanjing University of Science and Technology,Nanjing 210094,Jiangsu,China;Hebei GEO University,Shijiazhuang 050031,Hebei,China)

机构地区：[1]河北经贸大学管理科学与工程学院,河北石家庄050061 [2]南京大学地球科学与工程学院,江苏南京210046 [3]南京大学地下空间与地质环境研究所,江苏南京210046 [4]南京理工大学土木工程系,江苏南京210094 [5]河北地质大学,河北石家庄050031

出　　处：《水利水电技术（中英文）》2021年第9期135-142,共8页Water Resources and Hydropower Engineering

基　　金：河北省自然科学基金青年科学基金项目(D2020207003);国家重点基础研究发展计划(973计划)(2013CB036001);国防科技重点项目(科工二司[2015]297号);河北经贸大学科研基金青年项目(2019QN01);河北经贸大学博士科研启动经费(0112190705)。

摘　　要：断层影响带的渗透特性演化规律的获取对重大地下工程的布局、设计及建造等具有极为重要的参考价值。以西北某高放废物处置预选区边界断层及下盘节理识别为前提,在节理线密度统计分区的基础上,精细化布设钻孔,以引入的高精度在线示踪技术为主要实测方法,辅以压水试验数据,初步获取了断层至原岩区的渗透特性演化规律:核部碎裂岩带的渗透系数为10^(-6) m/s,损伤带为10^(-7)~10^(-8) m/s,原岩区为10^(-8)~10^(-9) m/s,趋势为随着远离断层核心区,渗透系数逐渐减小;核部除有限的相对低渗的核心区外整体导水良好,沿断层走向为优势渗流方向,其走向渗透性比垂向渗透性大约2倍;该试验点靠近断层损伤带原岩区中的张性节理对岩体渗透性贡献率要大于剪性节理,两者渗透系数可相差约2倍多。It is of great reference value for the layout,design and construction of major underground projects to obtain the evolution law of the permeability characteristics of fault-influenced zones.The recognition of boundary faults and joints at preselected sites for high-level radioactive waste disposal in Northwest China motivates obtaining such a law.Based on the statistical determination of the joint frequency,boreholes are drilled.The authors introduce high-precision online tracer technology as the main permeability test method,and the water pressure test data are supplemented.We initially obtained the evolution law of the permeability characteristics of the rock mass from a fault to the host rock:the permeability coefficient of the fracture zone is 10^(-6) m/s,the permeability coefficient of the damage zone is 10^(-7)~10^(-8) m/s,and the permeability coefficient of the host rock is 10^(-8)~10^(-9) m/s.Thus,the permeability gradually reduces away from the fault;except for a limited area with a low permeability,the core has a good overall conductivity.The fault strike is the preferential flow direction,and the permeability coefficient along the fault strike is nearly 2 times larger than that perpendicular to the fault;in the host rock near the fault damage zone,the contribution of the tensile joints to rock permeability is greater than that of the shear joints,and the permeability coefficient of the fault damage zone is more than 2 times that of the host rock.

关 键 词：高放废物处置预选区 断层 节理 在线示踪技术 演化规律 渗透系数 优势渗流方向 

分 类 号：P641.73[天文地球—地质矿产勘探]