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流-固耦合作用下岩体裂隙的萌生、扩展及相互贯通对高温岩体地热开发中人工热储的建造具有深远的理论和实际意义。依据弹性力学和流体力学理论,建立了不同应力和水压下的流-固耦合数学模型,采用修正Mohr-Coulomb强度准则作为裂隙岩体破坏的判别准则,运用有限元软件(Comsol Multiphysics)分析了水压力对裂隙岩体破环过程的作用机制。数值结果表明:不同深度对裂隙岩体破坏贯通区域形成的水压力值具有较大影响,水压力值随深度的变化规律近视服从指数关系。
The formation, propagation and interpenetration of rock mass fissures under the fluid-solid coupling have far-reaching theoretical and practical significance for the construction of artificial thermal storage in geothermal development of high-temperature rock mass. According to the theories of elasticity and fluid mechanics, the mathematical model of fluid-solid coupling under different stress and hydraulic pressure is established, and the modified Mohr-Coulomb strength criterion is used as the criterion to judge the failure of fractured rock mass. The finite element software (Comsol Multiphysics) Mechanism of water pressure on the breaking process of fractured rock masses. The numerical results show that different depths have a great influence on the water pressure value formed by the broken through rock mass, and the water pressure value follows the exponential relationship with the variation of depth.