刚性面板加筋挡土墙的离心模型试验研究

通过土工离心模型试验,研究了刚性面板加筋挡土墙的变形特征及其内在破坏模式。试验程序包括设计加速度条件下正常工作状态的模拟和极限加速度条件下极限工作状态的模拟,就挡土墙面板侧向位移和加筋材料的应变进行了实时测量;并测量了极限状态下模型剖面的位移标记的变形,从而获得了极限工作状态土体滑动破坏面的位置。试验结果表明:(1)加筋土挡土墙所发生的侧向位移量远小于无加筋挡土墙的位移量,并且加筋层竖向间隔越小,加筋层越密,相对侧向位移量越小,加筋效果越明显;(2)整体式刚性面板加筋土挡土墙的性能优于一般的分离式刚性块式面板加筋土挡土墙;(3)加筋材料有从回填体中被拔出破坏的可能性,因此,加筋风积沙挡土墙内部稳定性校核时,需要验证抵抗这种破坏的安全性。

Centrifugal Modeling Test on Reinforcement-Retaining-Wall with Rigid Face-Plate

This paper investigated,by centrifugal modeling test,the transformative characteristic and the internal destructive-mode of the reinforcing retaining wall with rigid faceplate.The test included modeling the normal working condition under the designed acceleration and modeling the extreme working condition under the extreme acceleration.During the test,the lateral displacement of the faceplate and the strain of the reinforcing material were measured in real time.Furthermore,by measuring the deformation of the position-sign on the model-section under the extreme condition,the position of the destroyed face in the slipping soil body under the extreme working condition was gained.The testing result indicated that(1) the lateral displacement of the retaining wall of reinforced soil was far bigger than that of the retaining wall of the unreinforced soil.Furthermore,the smaller the spacing between the reinforced layers,the smaller the lateral displacement would be,thus,the more conspicuous the reinforcing effect.(2) The reinforced retaining wall with integrated rigid faceplate works much better than the reinforced retaining wall with the detached rigid faceplate.(3) There was the possibility that the reinforcing material was pulled out of the backfill,so that,it is necessary to conduct safety check while verifying internal stability of the reinforced retaining wall of the wind-piled sand.