岩石应力-应变过程中渗透率变化分析

英文篇名：Analysis of permeability variation during the stress-strain process of rocks
中文刊名：煤田地质与勘探
英文刊名：Coal Geology & Exploration
作者：孙强 ; 朱术云 ; 张蕊 ; 姜春露 ; 钱海涛
英文作者：SUN Qiang1 ; 2 ; 3 ; ZHU Shuyun1 ; ZHANG Rui1 ; JIANG Chunlu1 ; QIAN Haitao4(1.School of Resources and Geoscience ; China university of Ming and Technology ; Xuzhou 221116 ; China ; 2.State Key Laboratory for Geomechanics and Deep Underground Engineering ; China University of Mining and Technology ; Xuzhou 221116 ; China ; 3.Key Laboratory of Engineering Geomechanics ; Institute of Geology and Geophysics ; Chinese Academy of Sciences ; Beijing 100029 ; China ; 4.Institute of Crustal Dynamics ; China Earthquake Administration ; Beijing 100085 ; China)
中文关键词：岩石力学 ; 渗透性 ; 本构模型 ; 渗透率-应力关系
英文关键词：rock mechanics ; permeability ; constitutive model ; permeability-stress behavior
出版日期：2012-02-25
机构：中国矿业大学资源与地球科学学院;中国矿业大学深部岩土力学与地下工程国家重点实验室;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;中国地震局地壳应力研究所;
年：2012
期：01
出版单位：煤田地质与勘探

摘要

岩石空隙率与空隙的几何性质是影响其渗透率的关键因素。通过分析渗透率-应变曲线与岩石破坏过程的对应关系,指出岩石的渗透率与岩石的体应变密切相关。在压密区间内,岩石的渗透率呈现为负指数下降;峰前膨胀区间内,渗透率快速增加,并在末期形成贯通性的渗透通道;在峰后阶段由于部分通道被堵塞,渗透率发生下降。同时,将断裂力学推广到考虑岩石介质的微观破坏不均匀性,指出岩石渗透率的变化主要是由尺度等级较小的微破裂的相互作用和生长引起的主干断裂,进而形成贯通性的渗透通道。
Considering the relation between permeability-strain curve and rock failure process,the relationship among permeability,strain and stress of rock is analyzed based on the permeability-strain curve and permeabil-ity-stress curve under complete stress-strain path.It is proposed that rock system gets its instability condition,when stress reaches the critical value.The experimental results verify the reasonableness of the analysis.The results show that the lowest rock permeability corresponds to the rock expansion point.The stress-strain path can be di-vided to three stages,which are compaction stage,expansion stage of pre-peak and post-peak stage.It is proposed that the change of rock permeability is caused by the interaction of the smaller micro-scale level burst,which re-sulted in the formation of permeable channel.

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