综合示踪与注水试验的花岗岩场址断裂渗透特性研究  

Study on the Permeability Characteristics of a Granite Site Fault Based on a Comprehensive Tracer and Water Injection Test

作　　者：张培兴 李晓昭[2,3] 黄震[2,4] 章杨松 ZHANG Peixing;LI Xiaozhao;HUANG Zhen;ZHANG Yangsong(College of Management Science&Engineering,Hebei University of Economics and Business,Shijiazhuang 050061,China;School of Earth Sciences and Engineering,Nanjing University,Nanjing 210046,China;Institute for Underground space and Geoenvironment,Nanjing University,Nanjing 210046,China;School of Resources and Environment Engineering,Jiangxi University of Science and Technology,Ganzhou 341000,China;Department of Civil Engineering,Nanjing University of Science and Technology,Nanjing 210094,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]江西理工大学资源与环境工程学院,江西赣州341000 [5]南京理工大学土木工程系,江苏南京210094

出　　处：《应用基础与工程科学学报》2021年第4期836-845,共10页Journal of Basic Science and Engineering

基　　金：河北省自然科学基金资助项目青年科学基金项目(D202007003);国家重点基础研究发展计划项目(2013CB036001);国防科技重点项目(科工二司[2015]297号);国家自然科学基金项目(41702326);博士后创新人才支持计划(BX201700113);河北经贸大学科研基金青年项目(2019QN01)。

摘　　要：当地下工程穿越或接近断裂时,断裂渗透特性能否有效评估关系到地下工程设计与修建的可靠性.以西北某高放废物地下处置预选区花岗岩场址断裂为研究对象,引入高精度示踪监测技术并针对单节理内示踪液运移缓慢的特点研发了配套的水流驱动模块,将其应用于该断裂结构的渗透特性分析中,配以注水试验,得出断裂走向破碎岩体渗透系数为6.0×10^(-5)m/s,比横向渗透系数大约2.3倍,断裂的优势渗流方向为断裂走向;断裂内部同一试验段上既存在良好渗流通道又存在局部相对低渗区,低渗区的渗透系数可降低至10-7~10^(-8)m/s;断裂横向渗透性能与断裂核部附近节理主要发育方向及断裂泥等低渗介质发育程度有关.When an underground project crosses or approaches a fault, effective evaluation of the fault permeability is related to the feasibility of the engineering design and construction of the underground project. Choosing a fault at a granite site in a preselected underground disposal area of high-level radioactive waste in Northwest China as the research object, high-precision tracer monitoring technology was introduced, and a hydraulic drive module was developed to change the slow migration process of a single joint tracer. Improved high-precision tracer monitoring technology was applied to the analysis of the permeability characteristics of fault structures. In the analysis, supported by a water injection test, it was preliminarily determined that the permeability coefficient of the fractured rock mass in the fault strike reaches 6.0×10^(-5)m/s, which is 2.3 times higher than the transverse permeability coefficient, and the preferential flow direction in the fault is the fault strike. Both a good flow pathway and a local zone occur, which is a relatively low-permeability zone with a permeability ranging from 10-7~10^(-8)m/s. The fault transverse permeability is related to the development direction of fractures near the fault and the development degree of low-permeability media, such as fault gouge.

关 键 词：高放废物地下处置预选区 花岗岩场址 断裂 示踪监测技术 注水试验 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]