裂隙岩体渗透系数确定方法研究  

DISCRETE FRACTURE NETWORK MODEL FOR HYDRAULIC CONDUCTIVITY OF FRACTURED ROCK MASS

作　　者：纪成亮[1,2] 李晓昭[1,2] 王驹[3] 赵晓豹[1,2] 汪志涛[1,2] 邵冠慧[1,2] 王益壮[1,2] 

机构地区：[1]南京大学地球科学与工程学院 [2]南京大学-华东有色地勘局地下空间与地质环境研究所,南京210093 [3]核工业北京地质研究院,北京100029

出　　处：《工程地质学报》2010年第2期235-240,共6页Journal of Engineering Geology

基　　金：国防科工委"十一五"项目(科工计[2007]825号);国家自然科学基金(40702046)

摘　　要：裂隙岩体渗透系数以及渗透主方向的确定对研究岩体渗透性大小及各向异性具有重要意义。高放废物地质处置库介质岩体的渗透性能将直接影响其使用安全性。本文运用离散裂隙网络模拟的方法对我国高放废物处置库甘肃北山预选区3#钻孔附近裂隙岩体进行了渗透性质分析。通过对3#钻孔171.5~178.0m段压水试验数据的反演,标定了离散裂隙网络渗流模型中的裂隙渗透参数（导水系数T）。利用标定的离散裂隙网络模型对场区裂隙岩体进行了渗流模拟,确定了该区域裂隙岩体的渗流表征单元体（REV）的尺寸大小以及渗透主值和主渗透方向。运用离散裂隙网络模型计算得出的渗透主值的几何均值与现场压水试验计算结果较接近,证明了计算结果的有效性。Quantification of hydraulic conductivity and principal hydraulic directions of fractured rock mass is very important for its permeability.The hydraulic property of rock mass around geological repository of high-level radioactive waste directly determines its safety in operation.The permeability property of rock mass around the 3# borehole in Beishan Area,Gansu Province is analyzed using the discrete fracture network model.The fracture transmissivity of the fluid flow model is calibrated via simulating the packer test process conducted in the depth range 171.5～178m of the 3# borehole.The REV（Representative Element Volume）size and principal hydraulic conductivity of the rock mass near the 3# borehole are determined via performing the flow calculations based on the tranmissivity calibrated discrete fracture network model.It is found that the results are compared quite well with those obtained through the radial flow continuum porous media model.

关 键 词：裂隙岩体 渗透系数 离散裂隙网络模型 裂隙导水系数标定 甘肃北山 

分 类 号：P642[天文地球—工程地质学]