非常低延展性裂隙岩体REV存在性研究  

Determining of the REV for fracture rock mass of very low ductility

作　　者：张莉丽[1] 张辛[2] 王云[1] 王吉亮[3] 王允[4] 于青春[1] 

机构地区：[1]中国地质大学水资源与环境学院,北京100083 [2]徐州建筑职业技术学院,徐州221116 [3]长江三峡勘测研究院有限公司,武汉430074 [4]北京市华清地热开发有限责任公司,北京102218

出　　处：《水文地质工程地质》2011年第5期20-25,共6页Hydrogeology & Engineering Geology

基　　金：裂隙岩体一般块体理论及应用研究(40372134)

摘　　要：裂隙岩体渗流问题一直是水文地质与工程地质的前沿课题之一,等效多孔介质模型是裂隙岩体渗流研究和工程应用的主要方法,此方法的重点在于裂隙岩体渗流模型即典型单元体(REV)的确定。本文采用作者自行开发的离散元软件FractureToKarst,根据国际岩石力学协会对岩石的分类,讨论了非常低延展性裂隙岩体典型单元体(REV)的存在性及大小,并给出确定其存在性的一般方法。通过研究可知,非常低延展性裂隙岩体REV存在的条件就是裂隙平均间距在0.2m以下,即极密间距、很密间距和密间距裂隙岩体存在REV。裂隙平均间距大于0.2 m,即中等间距、宽间距、很宽间距和极宽间距裂隙岩体不存在REV。Seepage problem of fracture rock mass is one of the front topics in hydrogeology and engineering geology.The equivalent porous medium model plays an important role in the study and engineering application of fracture rock flow.The key of its application lies in design of a correct fracture rock mass model,which means a representative element volume（REV）.The code FractureToKarst,which is a main analysis tool in this paper and developed by Prof.YU,is a DFN（Discrete Fracture Network） software.According to the standard of rock fracture classification established by ISRM in 1978,this paper discusses the existence and sizes of REV depending on fracture rock masses of very low ductility using the DFN software and proposes a general method which may determines the existence of REV.Based on the existing study of the fracture rock flow,it is found that in the rock mass when their average spacing is less than 0.2 m,the REV exists and when their average spacing is more than 0.2 m,the REV does not exist.

关 键 词：裂隙岩体 渗流 典型单元体(REV) 离散元 

分 类 号：TU452[建筑科学—岩土工程] O357.3[建筑科学—土工工程]