Studying on Deposit Dynamic Characteristics and Preventing Measures of Debris Flow Along Highway in Western Mountain 

Xiwang WEI, Jingsheng DING 

College of Civil Engineering, Chongqing Jiaotong University, Chongqing, 400074, China 

Abstract: Debris flow is a type of natural geological disaster that frequently occurs suddenly in the western mountains because of the rainstorm. It is almost inevitably that highways cross accumulative region which is main focus of forming disasters，the effect of river bed erosion and deposition is the most obvious dynamic characteristics in debris flow complicated movement, and one of main dynamic force to destroy highway too. Based on Bagnold dilatant fluid model，Firstly，the process of deposit dynamiccharacteristics of debris flow is analyzed and deduced, equilibrium concentration of debris flow and gradient of deposition are two main factors which have influence on sedimentation morphological characteristics of debris flow.Then,12 large disastrous debris flow gully is selected，and the morphological characteristics of each debris flow deposited scopes has been studied. gradient of depositions of 12 large disastrous debris flow gully are calculated.And the deduced method is proved to be valid by comparing result with the result of the actual measurements ,rationality of theoretical models is verified.Lastly,the prevention and cure counter measure are put forward. The study results could present scientific guidance to road alignment selection of highway and its gully-crossing bridges and culverts and as well as the optimal design of disaster prevention and control project in western mountains. 

Keywords: Western mountain; Debris flows along highways; Bagnold dilatant fluid model; Accumulative region of debris flow; Gradient of deposition