刚性挡土墙位移模式对土压力的影响试验研究  

Experimental study of the earth pressure on a rigid retaining wall for various patterns of movements

作　　者：芮瑞[1] 蒋旺 徐杨青 夏荣基 Edo Ekata Emmanuel 丁锐恒 RUI Rui;JIANG Wang;XU Yangqing;XIA Rongji;Edo Ekata Emmanuel;DING Ruiheng(College of Civil Engineering and Architecture,Wuhan University of Technology,Wuhan,Hubei 430070,China;Wuhan Design and Research Institute Co.Ltd of China Coal Technology and Engineering Group,Wuhan,Hubei 430000,China)

机构地区：[1]武汉理工大学土木工程与建筑学院,湖北武汉430070 [2]中煤科工集团武汉设计研究院有限公司,湖北武汉430000

出　　处：《岩石力学与工程学报》2023年第6期1534-1545,共12页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家自然科学基金面上项目(42272315)。

摘　　要：挡土墙位移模式对墙后土压力分布及土体滑移变形与破坏模式具有重要影响。研究采用开发的可视化挡土墙模型箱和石英砂填料,开展平动、绕底部转动、绕顶部转动、绕中点逆时针转动和绕中点顺时针转动5种模式的模型试验。将实测土压力与现有计算理论进行对比,对静止土压力、极限土压力及其土压力随挡墙位移变化规律进行了分析,同时采用粒子图像测速技术分析土体的滑移变形特征和破坏模式。结果表明:静止土压力沿墙深呈线性增长趋势,由于砂土超固结导致实测值大于理论值;不同位移模式土体达到极限状态所需的位移量存在较大差异;由于砂土密实程度高,导致平动、绕底部转动、绕顶部转动极限土压力实测值小于理论值;绕中点逆时针转动和顺时针转动极限土压力合力作用点较绕顶部转动和绕底部转动分别出现上移和下移;不同位移模式的滑移面呈现出不同的形态,实测滑移面倾角略大于理论值;绕底部转动、绕中点顺时针转动表现为渐进式破坏,平动、绕顶部转动、绕中点逆时针转动表现为整体式破坏。The movement patterns of retaining wall has important influences on the distribution of earth pressure and the soil deformation and failure modes of behind the wall.Using the developed valuable retaining wall model test apparatus and quartz sand filler,model tests were carried out in five patterns:translation,rotation around the bottom,rotation around the top,counter clockwise rotation around the midpoint point and clockwise rotation around the midpoint point.The measured earth pressure was compared with the existing calculation solutions,and the earth pressure at rest,ultimate earth pressure and the variation law of earth pressure with deformation were analysed.At the same time,the soil deformation characteristics and failure modes of soil were analysed using the particle image velocimetry technology.The results show that the earth pressure at rest increased linearly along the wall depth,while the measured value was greater than the theoretical solutions due to the over consolidation of sand.There are great differences for the displacement required for reaching the limit state under different displacement patterns.Due to the high compactness of the sand,the measured value of the limit earth pressure of translation,rotation around the bottom and rotation around the top was less than the theoretical solution.The action point of resultant force of the limit earth pressure of counter clockwise rotation and clockwise rotation around the midpoint moved up and down respectively compared with that of rotation around the top and bottom.The slip shear planes of different displacement patterns showed different shapes,and the inclination angles of the measured slip planes was slightly larger than the theoretical values.Rotation around the bottom and clockwise rotation around the midpoint showed progressive failure mode,while translation,rotation around the top and counter clockwise rotation around the midpoint show integral failure mode.

关 键 词：土力学 刚性挡土墙 位移模式 土压力 极限状态 破坏模式 

分 类 号：TU43[建筑科学—岩土工程]