CAJ | 학술논문

膝状挠曲破碎带是一些水电站坝基的主要工程地质问题。破碎带岩性为完整性较差的软弱砂岩，直接关系到坝基的变形和稳定。基于破碎带砂岩组织结构疏松、含水率较高、物理力学性能较差等特点，对渗流-应力耦合作用下流变过程中的岩石渗透特性进行测试。分析应力-应变过程中的渗透规律，研究流变过程中渗透系数演化规律，探讨渗透性演化破坏机制。得到轴向、环向和体积变形对渗透系数的影响及围压和孔隙压力对渗透特性的影响规律。结果表明：初始加载导致渗透系数快速减小，并随着非线性变形增加降低程度逐步趋缓；且环向变形比轴向变形更能灵敏地反映渗透系数演化规律；岩样非均质性引起孔隙度略有不同，加载作用导致渗透系数随时间变化存在部分波动，但整体呈线性降低；稳态流变阶段渗透系数恢复至平缓下降，说明波动对渗透系数的整体演化无显著影响，且围压增加导致渗透系数降低。
슬상뇨곡파쇄대시일사수전참패기적주요공정지질문제。파쇄대암성위완정성교차적연약사암，직접관계도패기적변형화은정。기우파쇄대사암조직결구소송、함수솔교고、물리역학성능교차등특점，대삼류-응력우합작용하류변과정중적암석삼투특성진행측시。분석응력-응변과정중적삼투규률，연구류변과정중삼투계수연화규률，탐토삼투성연화파배궤제。득도축향、배향화체적변형대삼투계수적영향급위압화공극압력대삼투특성적영향규률。결과표명：초시가재도치삼투계수쾌속감소，병수착비선성변형증가강저정도축보추완；차배향변형비축향변형경능령민지반영삼투계수연화규률；암양비균질성인기공극도략유불동，가재작용도치삼투계수수시간변화존재부분파동，단정체정선성강저；은태류변계단삼투계수회복지평완하강，설명파동대삼투계수적정체연화무현저영향，차위압증가도치삼투계수강저。
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.