加筋土挡墙破坏形式的离心模型试验研究

Experimental Investigation on Failure Modes of Reinforced-Sand Retaining Wall

针对加筋土挡墙内部破裂形式存在争议的问题,通过几组离心模拟试验,研究了不同拉伸强度和不同网格尺寸的网格式材料作为加筋材料的加筋土挡墙的变形和沉降特征,初步判定了用网状加筋材料的加筋土挡墙的破裂面形式和破裂面的大致位置。通过对几组离心模拟试验结果的对比分析,发现:加筋体的复合强度是加筋土挡墙破裂面位置变化的一个重要影响参数,加筋复合体强度较高的加筋土挡墙,其破裂面较小;随着加筋复合体的强度降低,加筋土挡墙的破裂面范围逐渐增大。据此认为,加筋土挡土墙的破坏面位置与形式和加筋材料对回填土的约束作用密切相关,当约束作用越强(此时筋土复合体强度高),加筋土挡墙的破坏面位置越靠近挡墙临空面,破坏体越小。

There are disputes over the inner failure mode of reinforced retaining wall.In view of this,centrifugal model tests were carried out to research the deformation and settlement of reinforced-sand retaining wall with grid material of different tensile strengths and grid sizes as the reinforcement material.The failure modes and the location of failure planes were preliminarily determined.Comparison of the centrifugal test results showed that the strength of reinforced sand and reinforcement material is a sensitive index to the failure mode.Reinforced sand retaining wall with higher strength has smaller failure plane,and vise versa.It＇ s concluded that the location and mode of failure is closely related with the restraining effect of reinforcement on backfill soil.When the restrain is stronger （which means that the strength is higher）,the failure plane location gets closer to the free face,and the failure part is smaller.