极限平衡理论下寒区危岩稳定性及关键参数研究现状

Research status of stability and key parameters of dangerous rock in cold regions based on limit equilibrium theory

危岩失稳破坏是我国寒区主要的地质灾害之一,基于极限平衡分析理论,采用力学计算结果可定量分析危岩稳定性,因此,对极限平衡理论下寒区危岩稳定性计算参数研究一直是寒区边坡工程的重点。在收集国内外相关资料的基础上,从多方面总结了关键参数的研究进展,指出了当前危岩稳定性及关键参数研究存在的问题:①自然环境中危岩体结构面冻胀理论的选取;②适用于土体(连续介质)冻结深度计算的经验公式是否适用于岩体(多孔介质);③如何界定主控面上岩体物理力学性能劣化规律。同时,对未来寒区危岩稳定性研究及发展予以分析,未来研究方向包括危岩结构面冻结深度研究的完善、多场多相耦合对危岩的劣化作用、断裂力学和损伤力学等理论与极限平衡理论相结合等方面。

The instability and failure of dangerous rock was one of the main geological disasters in cold regions of China.Limit equilibrium analysis theory could be used to quantitatively analyze the stability of dangerous rock based on the mechanical calculation results.Therefore,the research on the calculation parameters of the stability coefficient of dangerous rock in cold regions under the limit equilibrium theory has always been the focus of cold region engineering.On the basis of relevant data at home and abroad,the research progress of different key parameters was summarized from many aspects,and the existing problems in the research of dangerous rock stability and key parameters were pointed out:①Selection of frost heave theory of structural plane of dangerous rock mass in natural environment;②Whether the empirical formula for calculating the freezing depth of soil(continuous medium)was suitable for rock mass(porous medium);③How to define the deterioration law of physical and mechanical properties of rock mass on the main control plane.It also analyzed the research and development of the stability of dangerous rock in cold regions in the future,including the perfection of the study on the freezing depth of the structural plane of dangerous rock,the deterioration of multifield and multiphase coupling on dangerous rock,the combination of fracture mechanics,damage mechanics and limit equilibrium theory.