Research On Assessment Of Geologic Hazards Danger And Countermeasures Of Neijiang-Liupanshui Railway From Hengjiang To Daguan

This paper's research area is the section Hengjiang to Daguan of the Neijiang to Liupanshui's railway, which is situated in the river vally and gorge of the Hengjiang River, the first-degree branch of the Yangtse River, which is between the Xiaoliangshan Mountain and the Wumengshan Moutain,the east eage of the Sichuan-Yunnan Plateau.This area , characterized by its complicated mountain area condition in geography,is abundant with geological hazards such as collapse ,landslide,debris flow and so on.As earthquake ,which the earthquake magnitude is 5.1 of the Reichter scale, happened one after the other in July 22nd and August 25th in the Yanjin Couty,Yunnan Province,where this railway transit this area .It daminfied many establishments of this railway.The normal railage was intermitted for lasting more than 48 hours.The losses of the railage were very serious.Therfore,how to evaluate these geological hazards such as the collapse,the landslide,and the debris flow,is important to prove scientific basis to the railway department for preventing and curing these geological hazards.In this paper,relevant discussions have been dug into this research domain.In this paper, we take the primary geological hazards along the railway from Hengjiang to Daguan, one section of the Neijiang-Liupanshui Railway, as the research objects. On the basis of out-site investigation and detailed analysis of geologic data, the author expatiates the regional environmental geology and summaries the geological disaster type, scale, developing and distribution characterization in the representative area along the line.Establishing the suitable categorization criterion and index system of actual geological environment in this area for the predictable evaluation of each single geological hazard. The weights of evaluation factors are established by using the analytic hierarchy process (AHP) method. In this paper, I use the method of fuzzy comprehensive evaluation on the assessment of collapses stability, and also use the AHP method and comprehensive index method in comprehensive assessment of landslide and debris flow danger degree.Lastly, the author constructed the basic index system for comprehensive risk evaluation of geological hazards in this area, definited the criterion of the evaluation factor and given the criterion value of the corresponding factor. This paper evaluated the geological environment quality of the railway respectively with the AHP-based two-level fuzzy synthetic evaluation and the extension method-based matter element analysis method. The results of the quantitative evaluation are satisfied with the qualitative analysis. At the same time this paper combined macro qualitative analysis to divide the research area into different geological hazards zone and give the primary countermeasures for the primary geological hazards. Generally speaking, these two quantitative evaluation methods used in the risk comprehensive assessment of the primary geological hazards along the railway from Hengjiang to Daguan, one section of the Neijiang-Liupanshui Railway, especially the extension method, is a new attempt to risk comprehensive assessment of geological hazards of this railway and get a very good effect. The study results are accorded with the practical investigative disastrous conditions and have preferable practicability. It can become the reference to the risk assessment, prevention and cure of geological hazards in this section along the railway in the future.