工作状态下加筋土挡墙土压力分布规律研究

Study on distribution of working lateral soil pressures for reinforced earth retaining wall

加筋土挡墙墙背侧向土压力的计算方法都不能很好地解释工作状态下的分布情况,现场测试表明土压力沿墙高呈上下小、中间大的形式分布。微元体法得出的重力式挡墙墙背主动土压力与静止土压力分布形式与加筋土挡墙现场测试结果比较接近,然而2种土压力进行组合后,分布形式吻合得非常好,但大小相差比较大。综合考虑了拉筋垂直层间距与填料的影响,提出了加筋土挡墙墙背土压力计算模型,并对模型中的拉筋层竖向间距对加筋土挡墙墙背土压力的影响系数进行了初步探讨,然后与现场测试结果进行了对比分析,证实了该模型的合理性。

At present, no methods for lateral soil pressure of reinforced earth retaining wall can explain the distribution of working pressure. The site tests show that the lateral soil pressure is distributed with greater value in the middle and less though at the bottom and the top. The distribution of the active and static soil pressure in the gravity retaining wall, which is obtained according to differential element method, is quite close to the site tests of the lateral soil pressure in reinforced earth retaining wall. The linear combination of the active and static soil pressure is consistent with the site test in shape, but not in values. According to soil pressure combination, lateral soil pressure model considering vertical spacing of in reinforced earth retaining wall was put forward. This paper discusseed influence coefficient of the vertical spacing of the reinforcement to the lateral soil pressure in reinforced earth retaining wall. Then the model was confirmed by the site tests and the results show the reasonability of the model.