Stability Analysis And Treatment Measures For High Slope

With the rapid development of China’s economic construction,many personal and property losses due to slope instability have been seen.The comprehensive protection design of slopes has attracted the attention of the society.Slope design is not only based on local conditions to choose practical,reasonable,economic and beautiful engineering measures,to ensure people’s life and property,and to achieve relative coordination and balance with the surrounding environment,and to beautify the society.The rational distribution of groundwater,rainfall intensity,terrain,soil and material sources should be taken into consideration.Based on the high slope for example,the first type,the slope on the slope scale,influencing factors and failure forms,causes and other aspects of the analysis,and then using the finite element analysis software MIDAS GTS,the weight of heavy rain and earthquake of three conditions for stability analysis,stability evaluation of high slope Dongzhiyuan.Finally put forward the comprehensive prevention measures.The main contents and preliminary conclusions of this paper are as follows:(1)Through consulting and reading references,the main factors that affect the stability of high slopes are analyzed,and the common failure forms of soil and rock slopes are summarized.The analysis methods for the stability of high slopes at home and abroad are summarized.Taking Dongzhi high slope as the research object,this paper analyzes the influencing factors and failure forms of the stability of the high slope in Dongzhi plateau,including the following aspects: topography,stratigraphy,lithology,geological structure,neotectonic movement,hydrogeological conditions,and human engineering economic activities.(2)To analyze the types,development scale and trend of the high slope.The basic characteristics,structural features and deformation characteristics of Dongzhi high slope are summarized,and the deformation and deformation reasons of the high slope in Dongzhi plateau are summarized.Dongzhiyuan special high slope in the left bank of the river Po Zhuang Village Road Xifeng District,the average body length of 450 m,width 80 m,height72-90 m,sliding body thickness of 5 ~ 15 m,the average thickness of 10 m,the slope of the volume is about 45 * 104m3,medium scale.The unstable slope material structure ofPleistocene Ma Lan loess,Pleistocene Lishi loess and Cretaceous sandstone is composed of quaternary.The hydrogeological condition of the slope is simple,and there is no groundwater in the slope.There is no large geological structure in the slope area,and there is no Holocene Active fault.The basic seismic acceleration value is 0.05 g,and the characteristic period of the seismic reflection spectrum is 0.45 s.Ma Lan loess slope site,not out of Lishi loess collapsibility..(3)To the high slope as the prototype,according to the geological survey report,determine the size of soil parameters and model of finite element analysis,the establishment of three-dimensional slope model using finite element analysis software MIDAS GTS,analysis of gravity,rainstorm and earthquake conditions,slope displacement nephogram and stress nephogram,obtained in each condition under the condition of slope is the most unstable position.The safety coefficient of the three working conditions is 1.11,1.08 and 0.96,respectively.The comprehensive evaluation shows that the slope is in an unstable state.The most unfavorable fracture surface is in the front of the Aeolian Loess slope.(4)The unstable slopes of the plateau are mainly threatened by the construction of two sections of Mao Jia Si to Ba Jia Sui highway three,and the safety and safety of production and life of the nearby villagers.Once the slope instability occurs,the consequences are very serious,and it is very necessary and urgent to control the unstable slope.For the treatment of unstable slope,the comprehensive treatment program of "cutting engineering + frame anchorage engineering + anti slide pile + retaining wall(preset)+ drainage engineering +sand hole support" is adopted.The stability of the slope can meet the design safety factor requirements,and the stability of the slope is good.(5)according to the data of the small Zhang boss frost heaving test,fitting water frost heaving ratio and temperature,rate and the relationship between salt content,degree of compaction,and its verification.On the basis of the fitting formula,the forecast model of the existing line base frost heave and the prevention model for frost heaving and frost heaving of the newly built subgrade are put forward.At the same time,the frost heaving prediction model based on BP neural network is established and verified.