岩石全应力-应变过程渗透变化规律分析  

Analysis on the Behavior of Rock Permeability along Whole Stress-strain Path

作　　者：江东辉[1,2] 孙强[2,3] 朱术云[3] 杨秀元[4] 

机构地区：[1]中国石油化工股份有限公司上海海洋油气分公司研究院 [2]中国科学院地质与地球物理研究所工程地质力学重点实验室 [3]中国矿业大学资源与地球科学学院 [4]中国地质调查局水文地质环境地质调查中心

出　　处：《金属矿山》2012年第2期22-24,44,共4页Metal Mine

基　　金：国家自然科学基金项目(编号:41102201);中央高校基本科研业务费专项项目(编号:2010QNA54)

摘　　要：根据岩石渗透率变化与岩石破坏过程的对应关系,分析了全应力-应变过程中岩石渗透性能随应变的变化特点及渗透率-应变和渗透率-应力之间的关联性。研究表明岩石渗透率增长起始点与岩石的膨胀点近似对应,随全应力-应变过程的渗透率可划分为3个变化区间:压密区间、峰前屈服区间、峰后区间。岩石破坏过程变化主要是由尺度等级较小的微破裂的相互作用和生长最终形成主干断裂,进而形成贯通性的渗透通道。同时通过试验数据验证了分析的合理性。Considering the relationship between permeability-strain curve and rock failure process,the variation characteristics of rock permeability with the stress and the correlation between permeability-strain and permeability-stress in the whole stress-strain process are analyzed. The results show that the rock permeability growth starting point nearly corresponds to the rock expansion point. The permeability in stress-strain path can be divided to three divisions, including compaction range, expansion range of pre-peak and post-peak range. It is proposed that the change of rock permeability is caused by the interaction of the smaller micro-scale level burst, which resuhs into the forming of permeable channel. Meanwhile, the rationality of the analysis is verified through the test data.

关 键 词：岩石力学 渗透性 渗透率-应变函数 

分 类 号：TU458[建筑科学—岩土工程]