水力作用下新近纪硬土/软岩质滑带结构重构的过程及效应

水力作用触发的新近纪硬土软岩滑坡占到西北地区地质灾害总数的四分之一，它们具有规模大、深层控滑与短程运动等特征。滑带结构重构的方式是控制上述运动过程主控因素。新近纪硬土软岩为片状黏土矿物、硬质方解石与石英颗粒的聚合体。受认知水平的限制，增湿、增孔压诱发矿物聚合体启动变形与快速滑移过程尚不清楚。在动态变形过程中，水分、片状黏土矿物与颗粒状方解石的结构重排列机理也缺少系统分析。为解决上述问题，拟以宝鸡蔡家坡滑坡等滑带地质剖面调查为基础，开展滑坡滑移的应力路径与水力环境解析，观测滑带地质剖面内矿物的粘聚结构、排列形式，模拟水力变化诱发滑带粘聚结构启动变化过程，探讨摩擦滑移引起矿物聚集与剪胀的机理，构建滑带强度定量表达关系式，计算分析蔡家坡滑坡的滑动距离。通过上述工作，可为揭示滑坡短程滑移机制、精确评估同类滑坡运动距离提供新思路，也为片状矿物聚合体的水力耦合变形机理研究提供新视角。

The Neogene hard soil and soft rock landslides caused by hydro-mechanical coupling action, accounting for a quarter of the total geological disasters in Northwest China, are characterized by large scale, deep sliding and short runout movement. The packing arrangement of structural reconstruction in the shear zone are the main factors controlling the above movement process. The Neogene hard soil and soft rock is a polymer of schistose clay minerals, hard calcite and quartz particles. Due to the limitation of cognitive level and technical means, the processes of initiation deformation and rapid sliding of mineral polymers induced by humidification and increased pore pressure have not been clear yet. In the process of dynamic deformation, the structural rearrangement mechanism of water, schistose clay minerals and granular calcite is also lack of systematic analysis.In order to solve the above problems, it is proposed to carry out the stress path and hydraulic environment analysis of the landslide slip based on the investigation of the geological section of the slip zone such as Caijiapo landslide in Baoji, observe the cohesive structure and arrangement form of the minerals in the geological section of the shear zone, simulate the starting change process of the cohesive structure of the shear zone induced by the hydraulic change, discuss the mechanism of the mineral aggregation and dilatation caused by the friction slip, and build the quantitative expression formula of the strength of the shear zone and calculate and analyze the sliding distance of Caijiapo landslide. The above work can provide a new way to reveal the short-distance sliding mechanism of landslides, accurately evaluate the movement distance of similar landslides, and provide a new perspective for the study of the hydraulic coupling deformation mechanism of schistose mineral polymers.