CAJ | 학술논문

为探讨细砂岩变形破坏过程中的渗透特性及声发射特征，采用MTS 815岩石力学试验系统及PAC PCI–2声发射测试工作站，对细砂岩进行三轴压缩条件下的渗透性和声发射特征试验，分析全过程中渗透率的变化规律、渗透率–应变关系、声发射特征及其与渗透性之间的关系。研究表明：细砂岩变形破坏过程中渗透率随应力–应变曲线呈阶段性变化，不同围压下渗透率的变化规律相似，随着围压升高，渗透率量值降低；横向应变ε3与渗透率K随轴向应变ε1的变化规律基本一致，横向变形增加的突变点与渗透率的突变点相对应，更能反映渗透性的变化；声发射特征反映了细砂岩变形破坏过程中裂纹的发展、演化过程，声发射和应力–应变、渗透率均具有很好的相关性；声发射特征参数能量率随围压升高而增大。基于声发射特征的分析能更好地揭示岩石变形破坏过程中裂纹的产生和发展状况，有助于深入认识岩石渗透性的变化机制。
위탐토세사암변형파배과정중적삼투특성급성발사특정，채용MTS 815암석역학시험계통급PAC PCI–2성발사측시공작참，대세사암진행삼축압축조건하적삼투성화성발사특정시험，분석전과정중삼투솔적변화규률、삼투솔–응변관계、성발사특정급기여삼투성지간적관계。연구표명：세사암변형파배과정중삼투솔수응력–응변곡선정계단성변화，불동위압하삼투솔적변화규률상사，수착위압승고，삼투솔량치강저；횡향응변ε3여삼투솔K수축향응변ε1적변화규률기본일치，횡향변형증가적돌변점여삼투솔적돌변점상대응，경능반영삼투성적변화；성발사특정반영료세사암변형파배과정중렬문적발전、연화과정，성발사화응력–응변、삼투솔균구유흔호적상관성；성발사특정삼수능량솔수위압승고이증대。기우성발사특정적분석능경호지게시암석변형파배과정중렬문적산생화발전상황，유조우심입인식암석삼투성적변화궤제。
In order to discuss the permeability and acoustic emission characteristics of fine sandstone during the deformation and failure process,a series of tests for characteristics of permeability and acoustic emission were performed under triaxial conditions by using MTS 815 rock mechanical test system and PAC PIC–2 acoustic emission test station. The variation of permeability,the relationship between permeability and strain and the acoustic emission characteristics were studied. The results show that the permeability during the process of deformation and failure changes in accord with the stress-strain curves,and the rules under different confining pressures are similar. The permeability decreases with confining pressure increasing. The changes of permeability and lateral strainε3 with axial strainε1have a good corresponding relationship. The point whereε3increases sharply is corresponding to where permeability increases,soε3reflects the variation of permeability better. The acoustic emission characteristics in the whole process reflect the development of the cracks,and the acoustic emission correlates well with the stress-strain and permeability. The energy rate,one of the parameters of acoustic emission,increases with confining pressure increasing. The characteristics of acoustic emission can reveal the emergence and development of fractures in rocks,which can develop a deeper understanding of the variation of permeability during the deformation and failure process.