Study On Stability And Control Measures Of Disturbed Ancient Landslides

With the rapid development of economic construction in China,the number of expressway projects is increasing,especially in the central and Western regions,which need more developed transportation to drive the local economic development.Landslide is a common geological hazard in Northwest China.Because of the complex structure and engineering characteristics of geotechnical,it is difficult to predict landslide hazards.Weibin District of Shanxi Province is a high-incidence area of landslides.Goujialing landslide in Weibin District belongs to ancient landslide.Collecting data of mapping,exploration,test and others of slope,and adopting a method of theoretical computation and numerical simulation,by which study mechanism and stability of ancient landslides in depth.The main research results are as follows.(1)Goujialing landslide is included in Ancient Landslide.The development features and distribution characteristics of landslides in this area are studied by field investigation and laboratory test.It can be seen that natural factors and human engineering activities are the main factors affecting slope stability,then the landslide has potential dangerous sliding zone.(2)Calculation and analysis of landslide by Limit Equilibrium Method,the influence factors of slope excavation disturbance and rainfall infiltration are analyzed.The results show that the slope becomes unstable due to the dual role of excavation disturbance and rainfall conditions.Further research and calculation with FLAC3D,and analysis of slope shear stress increment nephogram,displacement nephogram and plastic zone,which can be concluded that the fundamental cause of slope instability is that excavation disturbance and rainfall make the sliding resistance of potential sliding zone of slope decrease.(3)Orthogonal experimental design of four factors and four levels and calculation for soil nailing,the degree of influence of various factors are researched on slope stability by Analysis of Variance.By changing the length and spacing of anti-slide piles,the influence of the change of pile length and spacing on slope stability is obtained.(4)Four sliding sections of H-2 landslide slope are analysed and advanced a treatment scheme mainly anti-slide pile primarily,anchorage in order to supplement,by which the stability of landslide is improved after protection and reinforcement.After calculation by strength reduction method,it is found that it conforms with the regulations.