Disaster Analysis Of Landslides And Debris Flows In Long Heng Gully

Dragon Yokomizo slip zone is located in Gaoyang town of Wangcang County,since the "5.12" after the earthquake,the old landslide and debris flow which exists in the region deteriorated,in the event of a long time high strength after heavy rain,is now in the resurrection of the weak deformation stage,once the further development,will affect the residents within the landslide the personal and property safety and traffic congestion,so timely and effectively prevent the occurrence of the landslide will have very important significance.In this paper,Gaoyang Wang Zhenlong ditch landslide and debris flow as the research object,based on analyzing the existing geological data and landslide causes,using Lizheng software representative of the Dragon Yokomizo III landslide stability profiles were calculated according to the calculation results,the evaluation and prediction of the landslide stability.The sensitivity analysis of the stability factors of the landslide is carried out by using the orthogonal analysis method.For debris flow,the main movement characteristics are calculated,and the risk assessment is carried out according to the calculated results.Finally,according to the characteristics of landslide and debris flow,the appropriate treatment scheme is put forward.The main research work and achievements obtained in this paper are as follows:(1)the representative of the Dragon Yokomizo III landslide slope stability calculation,the results show that the Lizheng software landslide is stable in natural state,is in a critical state in the rain condition.(2)the factors influencing the stability of the Dragon cross channel III landslide analysis: for the influence of internal friction angle,slope,earthquake and cohesion on landslide stability is highly significant influence on the stability of the landslide location of underground water level significantly,soil heavy influence on the landslide stability in general.(3)the risk assessment of debris flow in Long Gully gully area shows that the velocity of debris flow is very large and the carrying capacity is very strong.The handling of the largest stone volume can reach 16m3,weight can reach 2.6t,stone at the speed of 8.54 m/s following the debris flow,the overall impact pressure is246.88 k Pa,and the impact of single stone is up to 1419 KN,damage is very large.(4)aiming at the landslide and debris flow,a specific treatment plan is proposed.The method of cutting slope and setting up anti sliding retaining wall is adopted for the landslide of Long Gully,and the scheme of setting diversion slot for debris flow in Long Gully is put forward.