土工袋柔性挡墙位移模式及土压力研究

Earth pressure and deformation mode of a retaining wall constructed with soilbags

用土工袋构筑而成的挡土墙具有一定的柔性,在墙后土压力作用下,墙体能够发生一定的变形,墙后土压力分布及大小与刚性挡土墙大不相同。设计并进行了土工袋柔性挡土墙模型试验,通过试验观测了墙体的位移模式和墙后填土的破坏模式,研究了土压力沿墙体高度方向及墙体水平方向的分布;运用水平微分单元法推导了主动平衡状态下土工袋柔性挡土墙土压力的计算公式,土压力理论计算值与模型试验实测值基本吻合;进行了模型试验用土工袋层间摩擦试验,建立了土压力与土工袋层间摩擦力的平衡关系式,分析了土压力沿土工袋墙体水平方向的传递规律。

The retaining wall constructed with soilbags is relatively flexible and may deform under the action of the lateral earth pressure.The distribution and value of the lateral earth pressure are quite different from those of a rigid retaining wall.Model tests are performed on a retaining wall constructed with soilbags to investigate the deformation mode of the wall and the failure mode of the back-filled soil.The distribution of the earth pressures along the height of the wall and the horizontal transfer within the retaining wall are investigated.An equation for calculating the earth pressure on the retaining wall of soilbags is derived from the force equilibrium of a differential element.The earth pressures calculated by the derived equation agree roughly with the experimental measurements.The frictions between the soilbags are experimentally investigated,and are used to explain the horizontal decrease of the earth pressures within the retaining wall.