三维土压力盒在原位碾压试验中的应用研究

Application Research on Three-dimensional Earth Pressure Cell in In-situ Rolling Test

为了研究三维土压力盒在移动荷载下的工作情况,进行了原位碾压试验,将三维土压力盒埋入土中,通过石磙施加移动荷载并监测土体的静力反应,对测得的6个正应力进行计算得到测点处的三维应力状态。试验结果表明,3个正应力σ_(x)、σ_(y)和σ_(z)的发展趋势与荷载施加情况相一致,其中σ_(z)的值最大;3个剪应力σ_(xy)、σ_(yz)和σ_(zx)的测试曲线均呈现出波峰与波峰相连、波谷与波谷相连的特征,清晰地展现了剪应力的方向性。

In order to study the working condition of three-dimensional earth pressure cell under the moving load,the in-situ rolling test is carried out.The three-dimensional earth pressure cell is embedded in the soil,the moving load is applied by the stone box,and the static response of the soil is monitored.The three-dimensional stress state at the measuring point is obtained by calculating the measured six normal stresses.The test results show that the development trend of the three normal stresses(σ_(x),σ_(y) andσ_(z))is consistent with the load applied,of which the value of Z is the largest;Three shear stressesσ_(xy),σ_(yz) andσ_(zx) test curves show the characteristics of peak to peak and valley to valley,which clearly shows the direction of shear stress.