论文部分内容阅读
粘土质大型滑坡在渭河中下游地区广泛分布,簸箕山大型老滑坡位于宝鸡市市中心北坡,其长期蠕变滑动致灾风险较高,是陕西省与宝鸡市国土局重点监测的大型滑坡。为判别分析滑坡变形监测数据与滑动趋势,急需理清其滑带变形样式和滑体运动过程。基于滑坡地形及地层岩性、地下水调查,结合连续取芯钻探数据,进行了滑带及原岩物质成分、水理化性质及应力应变特征的物理化学实验,通过滑带与原岩的实验数据对比分析,结论如下:(1)簸箕山滑坡滑带发育于三门组粘土岩黏粒含量较高的层位中,滑坡蠕变变形亦集中于该位置、渐进扩展;(2)滑带粘土矿物以蒙脱石为主,具有较强的膨胀性和裂隙化特征,使得粘土岩在地下水作用下发生劈理化、塑性化及泥质化,使得剪切面贯通形成滑带。
Large clay landslides are widely distributed in the middle and lower reaches of the Weihe River. The large old landslide in the Mt. Shiuishan is located in the northern slope of downtown Baoji City, and has a long-term creep-slip risk. It is a large-scale landslide heavily monitored by Shaanxi Provincial Bureau of Land and Resources. In order to distinguish and analyze the landslide deformation monitoring data and the sliding trend, it is urgent to sort out the deformation pattern of the sliding belt and the course of the sliding body. Based on landslide and formation lithology and groundwater survey, combined with continuous coring drilling data, physical and chemical experiments on the composition of slide zone, original rock material, water physicochemical properties and stress-strain characteristics were carried out. By comparing the experimental data of slide zone and original rock Analysis and conclusions are as follows: (1) The slippery slope of the dustpan mountain landslide developed in the strata with high clay and clay content in the Sanmen Formation, and the creep deformation of the landslide also concentrated at this position and gradually expanded. (2) It is dominated by montmorillonite and has strong expansiveness and fissure characteristics. It makes the clay rocks split, plasticize and muddy under the effect of groundwater, making the shear surface pass through to form a sliding belt.