坡面冲刷的临界坡度的计算分析

Critical Slope Computation and Analysis of Slope Face Washout

分析了土质边坡临界坡度理论.通过坡面流拖曳力法、坡面流量法和坡面流挟砂力法对临界坡度进行了详细地分析计算,得出了坡面冲刷临界坡度范围,并由此分析得出目前公路边坡冲刷问题严重的一个原因就是由静力稳定性设计方法计算得到的安全坡度与临界坡度十分接近.

The theory of critical scour gradient of highway terrene side slope is analyzed in this article. The critical gradient is calculated at length through three methods,namely,slope surface current haulage force method, slope surface runoff method and slope surface current carrying gravel force method. According to the calculation result, the critical gradient bound of slope surface scouring is educed. A conclusion is also drawn after analyzing ： the safe gradient obtained through calculation using static stability design method is very close to the critical gradient is one of the reasons resulting in current severe highway side slope scouring problem.