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盐、水在岩石类脆性介质孔隙内结晶并对壁面产生的结晶压力作用是宏观上介质风化、冻融破坏形成的重要因素之一。将真实介质内的孔隙系统简化为各自相互贯通的理想球体、圆柱体、椭圆柱体及椭球体,并结合孔隙数量(体积)与孔径间的数学统计分布关系,提出了4种非均匀孔隙系统模型。在此基础上结合准平衡状态下非均匀孔隙系统的结晶规律、理想形态孔隙结晶压力理论及孔隙结晶应力的均化算法,推导了结晶过程中这四类模型的宏观“均化应力”计算方法和公式。以非均匀球状孔隙系统内NaCl结晶为例,探讨了宏观三向“均化应力”随结晶入侵半径(对应于孔隙溶液浓度)变化的发展演化规律。
Salt and water crystallize in the pore of brittle medium of rock and the crystallization pressure exerted on the wall is one of the most important factors in macro-medium weathering and freeze-thaw failure. By simplifying the pore system in the real medium into the ideal sphere, cylinder, ellipsoid and ellipsoid which are mutually connected, and combining the statistical distribution of the pore volume (volume) with the aperture, four kinds of non-uniform pore systems model. On the basis of this, the macroscopic “homogenization stress ” of the four models in the process of crystallization are deduced based on the crystallization rules of the heterogeneous pore system under quasi-equilibrium conditions, the theory of ideal crystalline pore pressure and the homogenization algorithm of pore crystalline stress. Calculation method and formula. Taking the crystallization of NaCl in the non-uniform spherical pore system as an example, the evolution and evolution of the macro-three-direction “homogenization stress ” with the radius of crystallization invasion (corresponding to the pore solution concentration) are discussed.