凝灰岩破坏全过程渗流演化规律的实验研究  

Experimental Study on Fluid Permeation Evolution in Whole Failure Process of Tuff

作　　者：刘洪磊[1] 杨天鸿[1] 于庆磊[1] 陈仕阔[1] 

机构地区：[1]东北大学资源与土木工程学院,辽宁沈阳110004

出　　处：《东北大学学报（自然科学版）》2009年第7期1030-1033,共4页Journal of Northeastern University(Natural Science)

基　　金：国家重点基础研究发展规划项目(2007CB209405);国家自然科学基金资助项目(506740251087204650874024);教育部重点科技项目(107033);教育部新世纪优秀人才支持计划项目(NCET-06-0291);教育部高等学校博士学科点专项科研基金资助项目(200801450003)

摘　　要：通过对凝灰岩在三轴环境下变参数条件的全应力-应变过程渗透性对比实验,研究了凝灰岩变形、破坏过程中渗透性演化规律,分析了凝灰岩破坏全过程中渗透率与体积应变及围压的关系,得出体积应变与渗透率函数关系.实验结果表明凝灰岩渗透率与应力水平密切相关.当岩样峰值强度之后,内部裂隙进一步扩展、贯通时,才会出现渗透率峰值,渗透率峰值拐点、应力峰值拐点和体积应变拐点很好的对应.该实验结果对于提出岩石破裂过程中更为合理的渗透性演化模型具有重要价值.Based on the test results of fluid permeation in the whole 3D stress-stain process of tuff under compression with variable parameters, the permeation evolution of tuff was investigated in the deformation/failure process to analyze empirically the relationship between volumetric strain, permeability and ambient pressure. The results indicated that the permeability of tuff closely relates to stress level. After the strength peak, the peak value of permeability occurs till the internal microcracks have been permeated through the rock specimen, with such inflection points as the peaks of stress and volumetric strain corresponding well to the permeability peak. This conclusion will be of great significance to the more reasonable mathematic model for predicting the fluid permeation evolution in the failure process of rock.

关 键 词：凝灰岩 全应力-应变过程 体积应变 渗透率 围压 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]