碎石土滑坡复活的力学机制及其转化研究

碎石土滑坡复活的力学机制是其变形预测、稳定性评价与防治设计的基础理论问题与瓶颈之一。目前关于碎石土滑坡地质与力学模型、影响因子、变形破坏模式、稳定性等已有众多研究成果，但基于碎石土滑坡地质结构体及其力学状态特征的演化规律角度研究其力学机制动态转化尚属空白。因此，本申请拟开展碎石土滑坡复活的力学机制及其转化研究。在碎石土滑坡地质结构模型概化及其基本因子构建研究基础上，重点研究碎石土滑坡系统基本因子(几何特征参数、地质结构力学强度参数、外动力条件)的作用规律，揭示滑坡力学状态特征及其演化规律；据此提出碎石土滑坡复活的力学机制及其转化判断标准；再针对概化的碎石土滑坡地质结构模型重点研究其力学机制类型的产生条件及因子对其复活力学机制的控制机理；最后结合实例开展碎石土滑坡复活力学机制的野外判断依据与识别技术研究。本项研究成果对碎石土滑坡复活的变形预测、稳定性评价和防治有重要理论意义和应用价值。

The understanding of the mechanical mechanism during reactivation of debris landslides is limited at present. This is one of the basic theoretical problems and becomes the bottleneck in the prediction, stability evaluation and treatment design of the debris landslides. At present, most studies focus on geological and mechanical models of landslides, impact factors, deformation and failure modes, and stability, few have attempted to study the transformation of mechanical mechanism of debris landslides based on the geological structure system and the evolution law of mechanical state characteristics. Therefore, it is proposed to study the mechanical mechanism and its transformation during reactivation of the debris landslides. Based on the generalization of the geological structure model and the construction of basic factors of the debris landslides, the regular pattern describing how each basic factor (e.g., geometric characteristic parameters, mechanical strength parameters of geological structural, external dynamic conditions) works in the debris landslides system is investigated, and the mechanical characteristics and its evolution law of the landslides are revealed. Based on this, the mechanical mechanism and its transformation criteria of the debris landslides are proposed. Subsequently, using the generalized geological structure model of debris landslides, the conditions for the generation of each mechanical mechanism and the mechanism how factors control the mechanical mechanism of landslides reactivation are investigated. Finally, the field signs for judgment and identification technology of mechanical mechanism during the debris landslides reactivation are proposed through case study. The research results have important theoretical and application value for improving the deformation prediction, stability evaluation and prevention of debris landslides.