大桥沟泥石流运动特征及其对工程影响分析

The debris flow movement characteristics and their influences on engineering projects in the Daqiao channel in Yalong River,southwest of China

以大桥沟泥石流为例,针对没有泥石流运动特征实测资料的情况,在地质调查的基础上,根据泥石流、洪水、暴雨三者之间的紧密联系,采用推理公式、雨洪修正与泥痕调查相结合,将已知的不同设计频率下的暴雨特征值转化为不同设计频率下的洪水峰值流量,最终求出不同设计频率下的泥石流峰值流量、一次泥石流总量及输沙量等特征值;最后结合泥石流发生频率分析,对泥石流对工程的影响作出评价。此方法可为西南地区在没有泥石流运动特征实测资料的情况下分析泥石流对工程的影响提供借鉴。

Aiming at the instance that there are debris flow, this paper introduces a method not measured data on the movement characteristics of that can analyse the influence of debris flow on an engineering project by taking the Daqiao channel debris flow for an example. Based on the diagnoses of debris flow development characteristics, according to the close relation of debris flow, flood and rainstorm, combining illation expressions, rain-flood modifying and mud trace investigation, making the known rainstorm characteristic values under different design frequencies to translate into flood peak value flux under different design frequencies, this method educes some characteristic values of debris flow peak value flux, once debris flow and transport sand gross etc. and in the last evaluates the debris flow influence on engineering projects combined with the analysis of debris flow occurring frequency. The analytical method will take a use for reference to analyse debris flow＇s influence on engineering projects in the southwest area without actual measured data on tile movement characteristics of debris flow.