Study On The Identification And Prevention Of The Roadbed's Disasters Caused By Washout

Western region of our country has complicated hydrogeological conditions, all kinds of disasters frequently damaged roadbed, and caused normal highway construction and enormous economic losses. Subgrade damage investigation and identification of potential hazards and disaster management is the premise of the damaged embankment. In order to minimum the input of control measures, when the small disaster or not disaster appeared, adopting a preventive treatment so that the damaged roadbed disaster will prevention in the first place. This paper studyed on the identification and prevention disaster of the roadbed,and obtained the following results:(1) Based on the related washout of the highway subgrade research data and investigation results of outdoor scene,considerring the bearer of washout and the results of damage, washout of the highway subgrade can be classified into:slope slump, thrust of the highway subgrade and subsidence of the highway subgrade by three kinds; etc. Through the analysis of causes and forming mechanism of the different types of washout, determining the hazard factors into different kinds of washout of the highway subgrade;(2) Because of the diversity,complexity and fuzzy of the hazard factors into washout of the highway subgrade, fuzzy mathematics and hierarchical analysis methods are used to establish the identification process of the washout of the highway subgrade.(3) As to collapses slippery in side slope and the roadbed's washing failure, I combine with typical project example to indentify the disaster factor,confirm the roadbed flood damage's risky index, then forecast its disaster situation;(4) Based on the factors and the formation mechanism on the roadbed flood damage, I propose the highway subgrade flood damage's prevention counter-measure from two sides: the side slope protection and the subgrade drainage, then give the subgrade drainage's principle of design, the form and the establishment condition on the side slope protection and the subgrade drainage.