兰州市红古区窑街20050906滑坡形成机理分析

兰州市红古区窑街地区地质构造条件复杂,人类工程活动强烈,地质灾害强烈发育。本文在野外地质调查、勘察和室内测试分析的基础上,对窑街20050906滑坡的形成机理进行了分析,滑坡区岩土体组成复杂,岩体风化卸荷严重,地表黄土中发育有陷穴和落水洞,下伏易风化泥页岩,岩层倾向与坡向一致,综合分析认为该滑坡在成因上属于黄土—基岩顺层滑坡,平面上分级分块特征明显。本文分析了多种工况条件下滑坡滑动前斜坡体的稳定性,在天然状态下斜坡体较稳定,在降雨、坡体堆载和坡脚开挖等因素影响下斜坡体发生滑动,并计算了各影响因素的影响权重。本文的研究方法和思路对于今后的类似地区滑坡的成因分析具有一定的指导意义。

Mechanism analysis of Yaojie 20050906 landslide in Honggu district, Lanzhou

The geological structure condition of Yaojie area is complex in Honggu district, Lanzhou, with strong human activity, and the geo-hazard is strongly developed. Based on field survey, geological prospecting and laboratory test, the paper makes formation mechanism analysis of Yaojie 20050906 landslide, the research indicates that the gneiss composition is complex in the landslide area, the rock mass weathering and unloading are ~ery serious, and there are loess sink and poor in the surface loess, the stratum of the underlying mud shale is fit to the slope. Comprehensive analysis, the landslide belongs to the kind of loess-bedrock layer landslides, of which the graded and blocked characteristics are obvious in the plane surface. According to the slope sliding analysis before sliding under different kinds of working conditions, the slope is comparatively stable in the natural status, and the slope will slide under the influences of rainfall, slope body heap load and weight of different factors. The research method slope excavation, the paper also calculates the influences and thought have important significance for the mechanism analysis of similar landslide.