砂筒承载力试验研究

Research on Bearing Capacity of the Sand Barrel

以浙江省宁波环城南路西延工程城市快速路高架桥为研究背景,采用理论和试验方法探究了砂筒填砂种类和含水率对砂土抗剪强度指标的影响,以及砂筒加载过程中环向应力和竖向位移的变化规律,结合土力学和薄壁容器理论计算了砂筒理论承载力。试验结果表明:含水率15%的粗砂和含水率10%的细砂的抗剪强度指标变化相对稳定;筒壁竖向应力自上而下逐渐增大,当加载到标准荷载时,砂筒底部环向应力最大。

Taking the urban expressway viaduct project of South Ring Road in Ningbo City, Zhejiang Province, as an example, the influence of type of sand filled in sand barrel and water content on shear strength index are researched by theoretical and experimental method. The variation laws of cyclic stress and vertical displacement are studied during the sand barrel loading process. Then, the theory bearing capacity is calculated by soil mechanics and thinwalled container theory. The experimentation results show that the shear strength index of coarse sand with a moisture content of 15% and fine sand with a moisture content of 10% are relatively stable. The vertical stress of the sand barrel wall increases gradually from the top to the bottom. When the standard load is applied, the maximum hoop stress will appear at the bottom of the sand barrel.