中国石油大学学报（自然科学版）Issue(4)：154-161,8.DOI:10.3969/j.issn.1673-5005.2014.04.023
渗流-应力-流变耦合作用下破碎带砂岩渗透演化规律试验研究
Experimental investigation on permeability evolution of sandstone from fractured zone under coupling action of hydro-mechanical-creep
摘要
Abstract
The knee-shaped deflectiOn fractured zOne lOcated in the dam-fOundatiOn Of a hydrOpOwer statiOn is a main engi-neering geOlOgical prOblem Of the prOject. The lithOlOgy is sOft sandstOne with pOOr integrity and pOre cementatiOn cOntact. The permeability prOperties Of sandstOne will significantly change under hydrO-mechanical-creep cOupling and prOduce a direct impact On the defOrmatiOn and stability Of the dam. Based On the characteristics Of lOOse OrganizatiOnal structure, high mOis-ture cOntent, pOOr physical and mechanical prOperties, the permeability measurements Of such rOck were perfOrmed during the prOcess Of time-dependent defOrmatiOn under hydrO-mechanical cOupling. Firstly, the permeability variatiOn during the prOcess Of stress-strain was analyzed, and the effect laws Of axial, lateral and vOlumetric strain On permeability evOlutiOn were Obtained. SecOndly, the permeability evOlutiOn during creeping cOurse was investigated in detail, and the influences Of pOre pressure and cOnfining pressure were discussed. Finally, the failure characteristics Of fluid flOw were studied in detail. The results shOw that permeability decreases rapidly during initial lOading and then decreases slOwly during further inelastic de-fOrmatiOn, and the lateral strain can reflect the evOlutiOn Of permeability mOre sensitively than axial strain. In additiOn, be-cause Of the heterOgeneity Of specimen, the permeability shOws sOme sudden change in relatiOn with the pOrOsity Of material during creep defOrmatiOn, hOwever, the Overall trend is decreasing. During the stage Of steady creep, the curve decreases linearly. It shOws that the fluctuatiOn has nOt significant effect On permeability evOlutiOn. FurthermOre, the permeability cOef-ficient decreases with the increase Of the cOnfining pressure.关键词
岩石力学/破碎带/软弱砂岩/渗流-应力-流变耦合/渗透演化/试验Key words
rOck mechanics/fractured zOne/sOft sandstOne/hydrO-mechanical-creep cOupling/permeability evOlutiOn/ex-periment分类
建筑与水利引用本文复制引用
张玉,徐卫亚,赵海斌,王伟,邵建富..渗流-应力-流变耦合作用下破碎带砂岩渗透演化规律试验研究[J].中国石油大学学报（自然科学版）,2014,(4):154-161,8.基金项目
国家自然科学基金项目(lll72090) （lll72090）
水能资源利用关键技术湖南省重点实验室开放研究基金项目(PKLHD20l306) （PKLHD20l306）
中央高校基本科研业务费专项资金项目(l3CX02095A) （l3CX02095A）
山区桥梁与隧道工程国家重点实验室培育基地(重庆交通大学)开放基金项目(CQSLBF-Yl4-4) （重庆交通大学）
