仰斜式挡土墙T模式下土压力试验

Test Study on Earth Pressure of Inclined Retaining Wall under T Mode

为了研究高速公路扩建路堤仰斜式挡土墙在T模式下受墙后填土不同荷载和差异沉降下土压力变化规律,建立挡土墙在T模式下墙背土压力计算模型,对土压力分布进行了理论计算。采用自行研制的实验模型箱对外加荷载5.249,10.248和15.247 kPa和新老路堤差异沉降0,3,6 mm条件下土压力的分布规律进行了试验研究。结果表明,在差异沉降条件下,墙背土压力沿墙高均呈先增大后减小的非线性分布,且随着挡土墙水平位移量的增加,土压力呈降低趋势,随着差异沉降量的增大,土压力呈增大趋势;不同荷载下,随着顶部施加荷载的增加,土压力呈增大趋势,随着挡土墙水平位移量的增加,土压力呈降低趋势;通过拟合发现,不同差异沉降和不同荷载与合力的变化呈二次函数关系,拟合函数公式分别为y=-0.0128x 2-0.0417x+23.99和y=-0.00392x 2+0.189x+0.173。结果为仰斜式挡土墙施工提供了理论依据。

In order to study the variation law of earth pressure under different loads and different settlement of inclined retaining wall under T mode.The earth pressure distribution of the inclined retaining wall in T mode was theoretically calculated by establishing the earth pressure calculation model.The test results of self-developed experiment model boxes with external loads of 5.249,10.248,15.247 kPa and differential settlement of new and old embankments under 0 mm,3 mm and 6 mm were studied experimentally.The test results showed that:under different settlement conditions,the soil pressure increased firstly and then decreased along the height of the wall.With the increase of the rotational displacement of the top of the retaining wall,the soil pressure decreased.With the increase of different settlement,the earth pressure increased.Under different loads applied at the top,the soil pressure increased with the increase of the loads.The change of difference settlement and different loads with the combined force were quadratic function through fitting and the function formulas were y=-0.0128x 2-0.0417x+23.99 and y=-0.00392x 2+0.189x+0.173.The results provide a theoretical basis for the construction of inclined retaining wall.