Application Of Numerical Simulation Technology In Jiuli Landslide During Emergency Disposal Process

The emergency response of geological disaster has the characters of social focus and time urgency.As we all know,disposal decision depends on scientific and efficient technical support,and numerical simulation technology has low cost,high efficiency,and the advantages of the convenience to consider a variety of different conditions and so on.So a special research has been done on the application of numerical simulation technology in the current disaster emergency disposal of the landslide in the paper with the expectation that the study will be helpful for emergency decision aid application.For this purpose,through literature analysis,landslide contingency case investigation and Jiuli landslide disaster empirical research,this paper demonstrates the application of numerical simulation technology in the emergency disposal of landslide geological disasters,its application process and application prospect.The main results of this paper are as follows:Firstly,this paper is based on the analysis of landslide and a large number of the existing research results.It summarizes the works of conventional numerical simulation in the analysis of stability,landslide mechanism and reproducing sliding process.Secondly,the representative cases of contingency or disaster of major landslides geological hazards in past six years were discussed,and the basic content of emergency work and technical needs has been cleared.It presents the basic conditions of numerical simulation applicable to geological disasters emergent rescuing.At the same time,we put forward the differences between conventional and emergency numerical analysis.It clearly figures out the characteristics of emergency numerical simulation,and the key problems about the application of numerical simulation to geological disasters emergent rescuing.Thirdly,based on the analysis of Jiuli rock landslide,the deformation,failure process of landslide and its engineering geological conditions have been studied by field investigation and analysis.The slope body's general information was collected by analysis of geological survey.The geological model of landslide evolution is proposed,and the landslide is conformed to be a typical creep-sliding and fracturing type.Fourth,with advantages of real time variable employment and large discontinuous simulation by the method of discontinuous deformation analysis(DDA),the DDA numerical model was build.The stability and the sliding process of landslide has been carried out with the DDA code.As the results show,the sliding process is successfully reproduced and the max horizontal displacement of the sliding body reached by DDA mode is 87 meters.The peak speed is 7 m/s.The results show that sliding distance is about 38 meters and the leading edge thickness is 53 meters.The whole duration of the landslide obtained by DDA method is about 70 seconds.The numerical results is consistent with the results of emergency investigation.Finally,the sensitivity analysis has been used to study the effects to sliding distance and speed of the landslide because of the rainfall weakening joint strength parameters.The internal friction angle ? has a significant effect on the sliding distance and speed of the landslide,but the cohesion c has little.The simulation results in maximum slip velocity and maximum sliding distance of landslide is consistent with actual field survey.At the same time according to the results of emergency investigation and numerical simulation,some recommendations was provided for the emergency proposal.