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岩体冻融损伤涉及低温环境下温度场、渗流场和应力场的耦合问题。基于水–冰相变理论和能量守恒原理,得出冻结率表达式。运用双重孔隙介质模型理论,根据质量守恒定律、能量守恒定律及静力平衡原理,得出冻结条件下裂隙岩体的温度场–渗流场–应力场(THM)耦合控制方程。最后,通过1个含裂隙隧道低温THM耦合算例,将围岩当作岩块与裂隙介质组成的系统,采用等效热膨胀系数法对夹冰(含水)裂隙的冻胀效应进行模拟,并考虑冻结过程对岩体渗透系数的影响,研究低温THM耦合条件下的温度场、应力场及孔隙压力等的分布规律。
Freeze-thaw damage of rock mass involves the coupling of temperature field, seepage field and stress field in low temperature environment. Based on the water-ice phase transition theory and the energy conservation principle, the expression of the freezing rate is obtained. Based on the theory of double porosity medium model and based on the law of conservation of mass, the law of conservation of energy and the principle of static balance, the coupled governing equations of temperature field-seepage field-stress field (THM) of frozen rock under freezing condition are obtained. Finally, a low-temperature THM coupling case with fissured tunnels was used to simulate the frost heaving effect of the ice-fractured (water-containing) fissures by considering the surrounding rock as a system of rock mass and fissure media, and taking the equivalent thermal expansion coefficient The influence of freezing process on the permeability coefficient of rock mass, the distribution of temperature field, stress field and pore pressure under low temperature THM coupling conditions are studied.