稀性泥石流对直道型排导槽的冲击试验研究

Experimental Study on Impact of Dilute Debris Flow on Straight Drainage Channe

为探究不同工况下稀性泥石流对直道排导槽的冲击力变化规律,搭建直道排导槽,进行3种配比、纯水和5种坡度的20组的试验。试验结果表明:1)稀性泥石流流体深度与冲击力成正比;2)稀性泥石流冲击力与坡度大小成正比;3)最大冲击力与稀性泥石流中粗颗粒含量成正比,粗颗粒含量较少的稀性泥石流的最大冲击力会在某个临界坡度出现突增;4)指数函数对稀性泥石流冲击力拟合效果最优,其中稀性泥石流的石∶沙∶土配比为4∶2∶1、2∶1∶4和2∶4∶1时冲击力与坡度的拟合函数分别为y=4.119 e^(0.07695x)、y=2.978e^(1.666x)和y=1.023e^(0.1318x)。

In order to explore the variation of the impact force of dilute debris flow on straight channel drainage groove under different working conditions,20 groups of tests with 3 mix proportions,pure water and 5 slopes were carried out in a straight channel drainage groove.The test results show that:1)the fluid depth of dilute debris flow is proportional to the impact force;2)the impact force of dilute debris flow is proportional to the slope size;3)the maximum impact force is proportional to the content of coarse particles in dilute debris flow,and the maximum impact force of dilute debris flow with less coarse particles will increase suddenly at a critical slope;4)the exponential function provides the best fit for the impact force of dilute debris flows.Specifically,when the mix ratios of stone to sand to soil in the dilute debris flows are 4:2:1,2:1:4,and 2:4:1,the fitting functions for the impact force relative to the slope are respectively function y=4.119e^(0.07695x)、y=2.978e^(1.666x) and y=1.023e^(0.1318x).