Study On The Cause And Prevention Strategy Of Highway Landslide Disaster In Northwest Fujian

With the rapid development of social economy,the construction of mountain road is accelerating.In the construction,it will inevitably destroy the original geological structure,and then bring a variety of geological disasters.Landslide is a common geological disaster in the process of mountain highway construction,in the geological disasters caused by the damage of mountain roads,the landslide is almost the most influential to the traffic of mountainous roads and the safety of people's lives and property.According to the reports,the highway landslide disasters of the northwest mountainous area in Fujian Province is relatively serious,it caused a great loss to the social economy of Fujian province.Therefore,it is an important content of mountainous highway construction to correctly and effectively analyze the causes of highway landslide in the northwest mountainous area and to protect the unstable slopes ahead of time.This paper take the landslides of northwest mountainous area of Fujian province as research object,which analyze the stability of the typical landslides of the area by finite element strength reduction method,and then select the typical landslide sections to analyze the causes of its landslide and put forward the corresponding prevention and control measures,the main research work and conclusions of this paper are as follows:Through the collection of a large number of relevant data about the landslide type and damage patterns of the region,this paper summarized the mountainous areas in northern Fujian mountain slope stability factors can be divided into two categories:natural factors(stratigraphy and lithology?geological structure?precipitation?vibration?vegetation)and human factors(highway route selection scheme?slope structure design?highway drainage design?construction organization design and method?vegetation man-made destruction).And the main types of slippery landslides in the northwest mountainous area can be divided into peeling?collapse?collapse?dumping?sliding and peristalsis.This paper described the common types of landslide?its causing reason?the prevention measures?applicable conditions and technological requirements detailly,and the basic principles,characteristics and construction methods of each protection mode are summarized.Based on the analysis of ZK60+200?+600 landslide in Dongfeng pavilion and Songxi to Jianou expressway landslide,it concluded that the occurrence of landslide is usually caused by the long-term effect under various unfavorable factors.On this basis,the corresponding treatment measures are proposed according to different landslide factors,to provide reference for other similar landslide control in northwest Fujian.Finally combined with engineering example,taking a typical slope section of K184+150?K184+260 section of highway expressway from Yongan to Wuping,using ANSYS finite element software to establish a finite element analysis model of landslide,then the stability of typical landslide is analyzed by finite element strength reduction method,and simulate the whole process of landslide deformation and destruction.Combined with the results of the analysis and the recommendations of the relevant engineering and technical personnel,put forward five governance methods,and use the analytic hierarchy process,expert group decision-making method and yaahp level analysis software to comprehensively evaluate the governance plan,get the weight of the program to sortso as to determine the best governance program.According to the calculation results of D4>D3>D2>D1>D5,the optimal scheme for this landslide treatment is scheme 4:anti-slide pile +drainage engineering,it has a certain reference significance for the selection of prevention and treatment of highway landslide in northwest Fujian.