Stability Analysis And Prevention Technology Research Of No.1 Pingzhai Landslide

This paper focuses on the engineering background of a high-cut slope of k107+680 highway in Honghe Prefecture,Yunnan Province,and takes the actual project wrong landslide body No.1 in Pingzhai as the research object.Through onsite investigation of the landslide,the errors are systematically summarized.The engineering geological conditions and basic characteristics of the No.1 landslide in Mo ping zhai were analyzed theoretically on the basis of which the mechanism and development process of landslide formation were studied,and the stability evaluation of No.1 landslide in Mo pingzhai was carried out using the limit equilibrium method.Then use the large-scale finite element geotechnical software Midas GTS nx to analyze and evaluate the stability of the high slope of the cut,and obtain the displacement,stress,strain and safety factor of the landslide under natural and rainfall conditions,based on the above research Based on this,different control schemes are proposed,and numerical simulations are carried out on the landslides treated by different control schemes to verify and compare the effects of different control schemes after treatment,so as to come up with the best control scheme.The main content and research results of this article are as follows:1.Through monitoring the excavated slope,a line graph of displacement-time change is made,and the result analysis shows that the horizontal and settlement displacement of the entire landslide gradually increase,and the excavated slope shows an unstable trend.2.The formation mechanism of the landslide is analyzed.The occurrence of the landslide is mainly due to human engineering activities,excavation of the foot of the slope,the formation of a free surface,and loss of support,which creates favorable conditions for the landslide.In the later period,under the effect of rainfall,rainwater penetrates into the slope body,and the shear strength of the soil body is low,which makes the slope body easily slip along the weak surface and cause engineering landslides.3.The large-scale finite element geotechnical software Midas GTS nx was used to establish a two-dimensional simulation analysis and evaluation of the high cutting slope,and the numerical simulation analysis revealed the displacement,stress,strain and safety factor of the slope before and after excavation,It can be seen from the numerical simulation results that the entire excavated slope is in an unstable or understable state,and the prevention measures for the landslide should be strengthened immediately.4.Based on the above theories and numerical simulation analysis,four different control schemes are proposed for the No.1 landslide in Coupai,and Midas GTS NX simulation technology is used to carry out numerical simulation research on the four proposed control measures to obtain the various control measures.Under the treatment effect of the scheme,it can be clearly seen that the distribution of the shear strain band in the scheme 4 is the smallest,the sliding shear strain band has the largest convergence,the highest safety factor is 1.2500,and the distribution range of the displacement field is the smallest.From the point of view of effect and safety,the fourth option(pre-stressed anchor cable anti-slide pile + lattice beam + mortar anchor + slope waist anti-slide pile)is the best prevention plan.