Research On The Stability Of Tieshenggou Landslide

The main purpose of this study is the effect of rainfall on landslide stability analysis of Tieshenggou, according to the monitoring data of landslide, the method of site investigation, field test and indoor test combination, using theoretical analysis and numerical analysis, research basis in Tieshenggou landslide in fact, the main results obtained are as follows:1) Review and clarify the engineering geology and environmental geology conditions and characteristics of the landslide. The landslide developed in the middle of a hillside in the Quaternary sedimentary layer soil landslide group have a large-scale development of the two deep mid-sized landslide group. Landslide II was in stable state in the action of anti-slide pile, landslide I was relatively low stability, and in front of a small landslide III was developed,Yu 31 highway landslide was still obvious uplift and crack.2) Determine the causes and mechanisms of landslides. Noted that the landslide located on the loosely packed layer slope that their stability is not high, transformation of highway construction, human engineering, as well as the rainfall is the main cause in Tieshenggou mine landslide. And the construction of highway and human activities are the controllable factors, and rainfall is an uncontrollable factors. Due to landslide soil loose and existing a lot of tension cracks, provides a convenient channel for the infiltration of rain, so the rain saturated zone longer on the sliding surface, and seriously affected the stability of landslide. Therefore, the main factors of landslide is rainfall.3) Through field and laboratory test, obtaining landslide hydraulic parameters, rationality and the parameters is verified by the historical record of the landslide sliding.Four kinds of working conditions of the landslide are stability evaluation including natural, saturated, natural+earthquakes, saturated+earthquake. Calculations show that a large deep landslide in the natural state is stable.under the natural + earthquakes is a limit equilibrium state, but in a saturated and unsaturated + earthquake are unstable; in the natural state, the factor of safety is not high, in saturation, natural + earthquake + saturated state easily seismic instability.4) Using unsaturated soil analysis software rainfall impact on the stability of the landslide were quantitatively calculated. Through the calculation of landslide I and landslide III that,under the rainfall intensity, rainfall duration, previous rainfall and rainfall interval are the 5 rainfall parameters, The main factors of landslide? occurrence is duration of the rainfall, the impact of short-term heavy rainfall on the landslide ?safety is small. The reason is that, Because the surface is deep, so that rainwater is difficult to penetrate into the surface position in brief rainfall, and the influence on safety factor is no obvious. But, for a landslide III, strong rainfall short-term will have obvious effects on the safety factor, the main reason is shallow surface.