Yizitou Landslide Treatment Design And The Study Of Numerical Simulation

In this paper,YinBai high speed(G69)Luo QuanGou section YiZiTou landslide as the research object,the engineering geological conditions such as meteorology,hydrology,topography,stratum lithology,geological structure and so on are summarized,and through the data collection and field survey,drilling and laboratory test methods to study the landslide stability and deformation mechanism,and using the limit equilibrium method of the landslide stability calculation and evaluation of landslide thrust calculation and numerical simulation analysis of the landslide,the stability coefficient,displacement and shear stress nephogram,the combined effect on Landslide Engineering of the landslide control design and numerical simulation the means of governance,to verify the rationality of the design method of specific governance.The main research contents and results are as follows:(1)YiZiTou landslide is a giant loess landslide,formation mechanism for slope leading edge water erosion,reduce the slope stability;under rainfall,rainwater infiltration slope,lower slope of Wucheng loess is relatively impermeable layer,thus forming a weak surface and form a sliding slope.(2)Through the limit equilibrium method,the stability of the landslide is calculated under the condition of two kinds of conditions.The results show that under the normal condition,the section of the two section is in a stable state.Under rainfall conditions,the secondary slip surface of section?—?'is in an unstable state,and the new shear front of the slope along the section ?—?'is unstable.(3)The use of Midas/GTS in two sections of the landslide are two-dimensional simulation analysis,the stability coefficient and displacement,shear strain nephogram analysis,after that,the landslide section?—?'displacement and strain of section mainly concentrated in the secondary slip plane in front of the landslide,a new shear outlet section ?—?'displacement and strain of the main focus on the subgrade slope.Compared with the results of limit equilibrium method,the numerical simulation results are in good agreement with the results.(4)According to the principle of landslide control and the stability of the landslide,combined with the relationship between landslide and highway,it is decided to adopt anti-slide pile + cutting method for Yizi head landslide,and to simulate the control scheme,The results show that the displacement and shear strain of the sliding body are greatly reduced and the displacement of the pile is less than the allowable displacement.The stability coefficient of the landslide is obviously improved and the landslide is in steady state.These indicate that the treatment scheme of the landslide is reasonable,Protective effect is better.The shear force and moment diagram of the anti-slide pile are obtained by numerical simulation.From the cloud diagram can be intuitive to see the anti-slide pile in the vicinity of the sliding surface and the middle of the anchor section of the largest force in the anti-slide pile reinforcement should focus on the calculation.