深埋高围压高水压下低渗透岩石的渗透特性  

The Permeability of Low-permeability Rock in the Deep Rock Engineering with High Confining Pressure and High Water Pressure

作　　者：陈振振[1] 阮怀宁[1] 顾康辉[2] 范衍奇 孔不凡[1] 袁文君[1] 

机构地区：[1]河海大学岩土工程研究所,南京210098 [2]河海大学大禹学院,南京210098 [3]江苏省水利科学研究院,南京210017

出　　处：《科学技术与工程》2012年第36期9870-9876,共7页Science Technology and Engineering

基　　金：国家重点基础研究发展规划(973)(2011CBO13504);国家自然科学基金项目(41272329)资助

摘　　要：为了探讨深埋高围压条件下低渗透岩石的渗透特性,取锦屏二级水电站大理岩试样分别进行不同围压条件下全应力—应变过程渗流试验。根据试验结果分析得出:岩石渗透系数变化与体积变形密切相关。因此,采用变形相关的渗透系数来研究岩石在破坏前后不同阶段的渗透系数与体积应变的关系。对于低渗透岩石,在峰前阶段渗透系数变化不明显,峰后破坏阶段渗透系数显著增大。高围压使岩石破坏延迟,岩石峰前阶段的低渗透特性表现的更持久。用变形相关的渗透系数模拟岩体流—固耦合问题更符合实际工程。In order to explore the permeability of low-permeability rock under high confining pressure, seepage tests on the specimens of marble taken from the Jinping U Hydropower Station under different confining pressure had been carried out. According to the test results obtained： the change of rock permeability is closely related to volume deformation, therefore, so the permeability related to deformation can be used to study the relationship be- tween permeability and volumetric strain of rocks in different stages of destruction. The permeability does not change significantly before the peak of the stress-strain curve for low permeability rocks. But the permeability of de- struction phase is significantly increased; high confining pressure makes rock damage delayed, and low permeabili- ty characteristics of the rock before the peak stage behave more lasting. So the permeability related to deformation is used to simulate flow - solid coupling in rock which is more valuable in engineering practice.

关 键 词：高围压 高水压 低渗透性岩石 渗透系数 

分 类 号：TU458.2[建筑科学—岩土工程]