Stability Analysis And Support Study Of High Slope In A Project Of Xinjiang

With the development of national economy,the slope is closely related to people’s life and production.Especially for the large infrastructure such as water conservancy,civil engineering,mining and transportation engineering,it is impossible to avoid the instability of many high slopes and huge losses to people because of the excavation or renovation of the rock mass.The stability analysis and management of slope have become a very important research topic in geoengineering and geological engineering.In this paper,through geological exploration report,site investigation,field and laboratory test,the slope engineering geological conditions were studied in detail,various factors affecting the slope stability were analyzed and the potential failure modes of the slope were summarized which is based on a left bank abutment high slope engineering in Xin Jiang.At the same time,the slope is also analyzed qualitatively by stereographic method and its stability was analyzed through the method of linear transfer coefficient.In addition,its stability was also simulated by using Midas.Finally,the reinforce the design was determined according to the characteristics and the failure mode of the slope.Its main contents include:(1)By studying in datail the engineering geological conditions of the slope in Xin Jiang including landform,stratum lithology,geological structure,hydrogeology,and weathering unloading and so on,the main influencing factors were summarized as topography,rock mass structure,earthquake,rainfall and so on.(2)By summarizing and analyzing the failure mode of slope,we ensured the main slope failure models of slope including the polyline strewn at random destruction,the dumping destruction,the collapse,the creep damage and the bedding sliding failure.(3)The stability analysis of the slope was carried out by qualitative method and quantitative method.The chipping-projection method was used for the qualitative analysis which results is that there is much crack on the right of the slope and the possibility of a wedge sliding.In this paper,the method of linear transfer coefficient was used to calculate the stability coefficient are 1.213,1.199 and 1.159 under the natural conditions,rainstorm conditions and the earthquake working conditions respectively.(4)By using the MADAS to build a 3D model to perform the numerical simulation of SRM(strength reduction coefficient method),the coefficient of stability are 1.18242 and 1.10156 under natural and earthquake working conditions respectively.(5)The slope is reinforced according to the slope failure mechanism,and its reinforcement method is to clear the dangerous rocks and to divide and place slope + anchor cable girder + bolt + drainage + grouting support.