CAJ | 학술논문

在热力学框架下，采用细观力学方法，建立热-水-力(THM)耦合条件下低渗饱水结晶岩的各向异性损伤模型，考虑非等温条件下微裂纹水压力作用、法向刚度恢复以及滑动剪胀等细观力学机制对岩石宏观力学性能的影响。在此基础上，采用均匀化方法，建立各向异性损伤诱发的岩石有效渗透特性演化模型，指出损伤岩石有效渗透特性下限估计模型的局限性，进而给出可反映损伤演化过程中微裂纹连通性等细观结构特征的岩石有效渗透特性上限估计模型。采用三轴压缩过程中花岗岩的渗透率变化、高温热处理后花岗岩的单轴压缩性能、TSX巷道开挖产生的围岩损伤与渗透率变化等室内外试验成果对模型进行验证。
재열역학광가하，채용세관역학방법，건립열-수-력(THM)우합조건하저삼포수결정암적각향이성손상모형，고필비등온조건하미렬문수압력작용、법향강도회복이급활동전창등세관역학궤제대암석굉관역학성능적영향。재차기출상，채용균균화방법，건립각향이성손상유발적암석유효삼투특성연화모형，지출손상암석유효삼투특성하한고계모형적국한성，진이급출가반영손상연화과정중미렬문련통성등세관결구특정적암석유효삼투특성상한고계모형。채용삼축압축과정중화강암적삼투솔변화、고온열처리후화강암적단축압축성능、TSX항도개알산생적위암손상여삼투솔변화등실내외시험성과대모형진행험증。
An anisotropic damage model was established for fluid-saturated crystalline rocks of low permeability in coupled thermo-hydro-mechanical(THM) loading conditions by using the micromechanical approach in the framework of thermodynamics. The proposed damage model accounts for the impacts of some important micromechanisms,such as the interstitial water pressure,normal stiffness recovery induced by compressed microcracks and sliding and shear dilatancy of closed microcracks,on the macromechanical properties of rocks under non-isothermal condition. On this basis,using various homogenization approaches,estimates were presented for the variations in effective permeability of cracked rocks induced by anisotropic damage propagation. The predictive limitations associated with the lower bound estimates for the effective permeability of damaged rocks were discussed;and a rigorous upper bound estimate was then presented to account for the influence of some important microstructural features,such as the connectivity and persistence of microcrack system,on the permeability variation. Existing laboratory tests on granite samples for damage-induced variation in permeability in triaxial condition and for uniaxial mechanical response after high-temperature thermal treatment,together with the in-situ measurements of excavation-induced damage zone and permeability variation in the surrounding rock of the TSX tunnel,were used to validate the proposed models.