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

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。

Abstract: 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.Accor...