溶蚀带控制的厚层山体视向滑动机理研究

The southwestern limestone area is characterized by folded mountains and is a highly prone zone for geological hazards. Catastrophes from massive geo-hazards have been took place frequently in the area and it becomes a hot spot for geo-hazards study. Except for "hard on soft" landform and under mining, karst rock mass and weak interlayers are the main factors for landslide initiation from cuesta mountains. The program chooses the Wujiang River basin to study the geological backgrounds and triggers for massive rock slope failures from cuesta mountains. An integrated method, combining mechanical tests, numerical simulation and physical modeling, was brought in to analyze physical-mechanical property variation during geological evolution, and to build constitute model of creep in different phases and schematic model of karst pipe system. It is aim to reveal mechanical characteristics of karstic rock mass and groundwater dynamics during rainstorm. The initiation process of apparent-dip slide, which is constrained by lateral karstification belt and weak interlayer, would be reproduced via numerical simulation and physical modeling. Based on the above work, it is expectable to propose the geological mode and accompanying stability analysis method for obliquely inclined limestone slope, as well as pre-recognition indexes. The whole work is expected to provide supports for geo-hazards mitigation in the southwestern limestone area.

我国西南灰岩褶皱山区是我国大型层状岩质崩滑灾害的高发区，发生过多起重大灾难性滑坡，成为地质灾害研究领域的热点与难点。单斜厚层灰岩山体除受"上硬下软、陡峭临空"的地形与地下采空人类活动影响外，溶蚀裂隙带与软弱夹层的强度及水力学作用成为控制大型山体启动的主要因素。本项目选择乌江流域为研究区，分析典型单斜灰岩山体大型滑坡的形成地质环境与诱发因素；采用室内试验、数值分析与物理模型试验相结合，分析提出软弱夹层的演化过程、物理力学性质变化及不同阶段蠕变本构模型，建立岩溶管道地质概化模型，研究溶蚀带强度特性及暴雨时岩溶管道动静水压力变化；结合数值分析与模型试验，分析侧向溶蚀带及软层控制的大型山体初始变形过程，提出斜倾厚层灰岩山体的工程地质力学分析模型、稳定性分析方法与早期识别特征，为西南灰岩山区防灾减灾提供技术支撑。

我国西南灰岩褶皱山区是我国大型层状岩质崩滑灾害的高发区，发生过多起重大灾难性滑坡，成为地质灾害研究领域的热点与难点。单斜厚层灰岩山体除受“上硬下软、陡峭临空”的地形与地下采空人类活动影响外，溶蚀裂隙带与软弱夹层的强度及水力学作用成为控制大型山体启动的主要因素。本项目选择乌江流域为研究区，分析典型单斜灰岩山体大型滑坡的形成地质环境与诱发因素；采用室内试验、数值分析与物理模型试验相结合，分析提出软弱夹层的演化过程、物理力学性质变化及不同阶段蠕变本构模型，建立岩溶管道地质概化模型，研究溶蚀带强度特性及暴雨时岩溶管道动静水压力变化；结合数值分析与模型试验，分析侧向溶蚀带及软层控制的大型山体初始变形过程，提出斜倾厚层灰岩山体的工程地质力学分析模型、稳定性分析方法与早期识别特征，为西南灰岩山区防灾减灾提供技术支撑。