Stability Evaluation Of High And Steep Slope In The Old Industrial And Agricultural School Site Of Baotashan Scenic Spot In Yan'an

China is the world's most widely distributed loess,the total area of 631 thousand square kilometers,covering nearly 6% of the country's land area.Some special characteristics of loess,such as good verticality,make the distribution of high and steep slopes in the loess area widespread,and the failure cases of loess high slope are not uncommon,which bring serious impact on the engineering construction and people's production and life in loess area.With the continuous development of the western region,the project construction activities in the loess area in northwest China are in full swing.The study on the stability of high-steep loess slope and its control measures has become one of the hot issues in loess research.Therefore,it is necessary and significant to further study the stability evaluation and treatment of high and steep loess slope.The research on loess high and steep slope control is not deep enough and the control measures and methods are not systematic.The specific project also has an important use value and engineering guidance significance.Based on the Baotashan Geological Hazard Management Project in Yan'an,this paper analyzes the stability of the high slope of the old industrial and agricultural school in Baotashan,and puts forward the governance scheme.Through research,this loess high and steep slope control engineering design has some new understanding,and achieved the following research results:(1)Based on the relevant data and results of engineering geological survey,the failure mechanism of the high and steep slope was studied by theoretical analysis and FLAC3 D numerical simulation respectively.The results show that the high and steep slope in the study area has many kinds of failure forms and stability The situation is worrying,urgent need to take engineering measures to be governed.(2)Based on the engineering geological conditions,stability evaluation results and its special political significance and historical value,this paper puts forward a technical scheme for comprehensive treatment using lattice anchoring technology.The method has the advantages of small disturbance to the slope,quick and easy construction,obvious effect of reinforcement,and better landscape after construction.(3)By using FLAC3 D numerical simulation,the slope protection mechanism of lattice anchor was studied,and it was put forward that if the position of sliding shear outlet was clearly defined during the design of lattice anchor,Anchor length,and to increase the lattice of the cross-sectional size,reinforced reinforcement to provide better support effect.At the same time,need to tie in with the drainage system facilities and greening measures in order to fundamentally eliminate the risk of slope instability to ensure that governance works reliability,safety,economy and aesthetics.