巢湖麒麟山东北坡狮子口段滑坡成因分析

Analysis of the Causes of the Landslide at the Shizikou Section on the North-East Slope of Qilin Mountain in Chaohu, China

摘要: 为了查明研究区滑坡形成机制，本文通过对野外调查与实验资料的研究，分析了该滑坡体的基本特征和所在区域的地质条件。运用简化毕肖普法分别计算了斜坡自然状态和暴雨工况下的稳定性系数，结果发现斜坡自然状态下处于基本稳定状态、暴雨工况下为不稳定状态，与实际情况相符。认为与斜坡倾向一致的软硬相间地层组合及较差的岩土工程性质是滑坡发育的内因，开采黏土矿导致外部地质环境条件改变，破坏了山坡的整体稳定性是滑坡形成的主要外因，暴雨极端天气是直接诱因，以上各种影响因素的不利组合，导致了研究区滑坡的最终发生。

Abstract: In order to find out the formation mechanism of the landslide in the study area, based on the study of field investigation and experimental data, the basic characteristics of the landslide and the geological conditions of the area had been analyzed. The stability coefficients under natural and rainstorm conditions were calculated by using the simplified Bishop method. The results show that the slope would be basically stable in natural conditions and unstable in rainstorm conditions, which is consistent with the actual situation. It is considered that the soft-hard interfacial strata consistent with the slope tendency and the poor geotechnical engineering properties are the internal causes of landslide development. The exploitation of clay minerals leads to the change of external geological environment conditions and destroys the overall stability of the hillside, which is the main external cause of the formation of landslides. Heavy rain extreme weather is the direct inducement. The unfavorable combination of the above factors would lead to the final occurrence of the landslide in the study area.