刚性面板加筋土挡墙室内模型试验研究

在研制的室内模型箱中,进行不同筋材配筋率和铺筋层数下加筋土挡墙模型试验,不同拉拔速度筋-土界面原位拉拔试验,分析了配筋率和铺筋层数对加筋土挡墙变形及土压力的影响及拉拔速度对筋-土界面抗剪强度的影响。结果表明,挡墙顶部沉降在筋材与面板连接处及挡墙后部较大,挡墙中间部位沉降较小。随着配筋率和铺筋层数的增加,挡墙顶部沉降和刚性面板倾角变小,面板受到的土压力减小。加筋土挡墙最优配筋率为60%~70%。拉拔速度对筋-土界面黏聚力几乎没有影响,但筋-土界面摩擦角随着拉拔速度的增加有增大趋势,从而导致筋-土界面的抗剪强度增大。

Indoor Model Eeperiment Study on Reinforced Retaining Wall

Indoor model tests on reinforced retaining wall with different reinforcement ratios, reinforcement layers and pulling speed are conducted in a chamber developed by the authors. The influences of different reinforcement ratios and reinforcement layers on deformation of the retaining wall and pulling speed on reinforcement-soil interface shear strength are analyzed. The test results show that the settlement at the joint of the reinforcement materials and panel of retaining wall is larger than the back and middle parts of the retaining wall. The settlement and rigid panel angle get smaller and the earth pressure decreases with the increase of reinforcement ratios and layers. What is more, the optimal reinforcement ratio of the reinforced retaining wall is between 60% and 70%. The pulling speed has little effect on cohesion between soil and reinforcement. But the friction angle increased with the increase of pulling speed, resulting in increase of shear strength on reinforcement-soil interface.