水压力对黏性原状土起动流速影响的试验研究

Influence of Water Pressure on Incipient Velocity of Cohesive Undisturbed Soil

为探究水压力对黏性原状土起动的影响,在一套能模拟不同大小的水压力的封闭管道试验系统中进行了黏性原状土起动试验。结果表明:当水柱高度从35 cm提高到435 cm时,黏性原状土的起动摩阻流速是0.35 m水柱高度下流速的2.52~3.06倍;黏性原状土的起动流速随着水压力的增大而增大;水柱高度、原状土的粒径级配以及原状土的密实度是起动摩阻流速的主要影响因素。该试验成果可为黏性原状土起动流速的进一步研究提供参考。

In order to study the influence of water pressure on incipient velocity of undisturbed test on the incipient velocity by using a closed rectangular pipe which could provide differesults show that incipient frictional velocity of undisturbed clay in the presence of 4.35 m water column height is 2.52-3.06 times that under 0.35 m height. In other words, incipient velocity of undisturbed clay increases with the increasing of water pressure. Besides, water column height, grain gradation and compactness of undare also main factors affecting the incipient frictional velocity.The experimental results can provide reference for fur-ther studies on incipient velocity of cohesive undisturbed soil.