砂土潮湿状态下悬臂式挡土墙RBT模型试验-《建筑科学与工程学报》

文章信息/Info

Title:: Experiment on RBT Model Test of Cantilever Retaining Wall Based on Sand Wet State

Author(s):: ZHANG Hong-bo, CUI Bing-bing, CHEN Qi, MENG Qing-yu, SONG Xiu-guang; School of Civil Engineering, Shandong University

Keywords:: RBT model; sand wet state; cantilever retaining wall; model test; earth pressure

摘要:: 鉴于悬臂式挡土墙在实际运营过程中受外界因素影响多呈现为挡土墙平移和绕墙底转动的组合位移（RBT）变形模式，且墙背填料经常处于潮湿状态，经典土压力理论不能合理反映其实际受力状态。为了揭示土体潮湿状态及RBT模式下悬臂式挡土墙墙后土压力分布规律，设计制作了基于RBT模式的悬臂式挡土墙模型试验装置，并开展了不同RBT转动位移量下的模型试验，得到了RBT模式下悬臂式挡土墙墙后土压力分布规律，并与现有理论对比，验证了试验结果的可靠性。依据测试结果，进行了理论公式验证。结果表明：对悬臂式挡土墙施加向外转动位移时，由于潮湿砂土存在较为明显的假性黏聚力，墙背土压力随墙体转动位移的增大而呈现较为明显的先减小后增大的趋势；随着转角增大，水平土压力减小，且下部土体减小趋势较缓，墙体中部位置水平土压力计算值大于实测值。

Abstract:: In the actual operation process, the cantilever retaining wall was mostly combined with shift of retaining wall and rotation around the bottom of wall (RBT) deformation mode caused by external factors, and the wall back packing was often in the wet state, so the classical earth pressure theory could not reasonably reflect the actual force state. In order to reveal the earth pressure distribution law of cantilever retaining wall under soil moist and RBT mode,the cantilever retaining wall test device based on RBT mode was designed and fabricated, and the model tests of different RBT rotation displacements were carried out.According to the test results, the theoretical formula was verified.The results show that when the cantilever retaining wall exerts an outward rotation displacement, the wet sand has a more obvious pseudo cohesion, the earth pressure of the wall appears obvious trend of decreasing first and then increasing with the increase of wall rotation displacement, with the angle increasing, the horizontal earth pressure decreases, and the lower soil decreases more slowly. The calculation values of horizontal central soil pressure are greater than the measured values.