圬工与加筋土组合式挡墙数值模拟

Numerical Simulation of Composite Structure of Masonry and Reinforced Soil Retaining Walls

基于圬工与加筋土组合式挡墙的土工离心模型试验结果,建立了ABAQUS数值模型,从而进一步研究了加筋间距和筋材模量对这种结构变形特性及内部土压力分布规律的影响。结果表明:在本文所考虑的参数情况下,从控制挡墙变形的角度来看,密间距加筋效果好于疏间距加筋,高模量筋材效果好于低模量筋材;由于下部圬工挡墙填土区域土拱效应的存在,使得上部加筋土挡墙的土压力分布有别于常规加筋土挡墙。在上部加筋土挡墙具有足够高度的情况下,可将圬工挡墙视为加筋土挡墙的稳固地基;组合式挡墙的变形主要发生在施工期,因此应加强施工质量控制。

According to centrifuge test results on the composite structure of masonry and reinforced soil retaining walls, numerical models were built by ABAQUS to study the influence of reinforcement spacing and modulus on the deformation characteristics and the soil pressure distribution of this composite structure. It is found that small rein- forcement spacing and larger reinforcement modulus have better reinforcement effect in controlling the deformation of retaining walls considering the variation range of parameters in this research. Due to the soil arch effect in the fill- ing zone of masonry retaining wall, the soil pressure distribution in the upper part of reinforced retaining walls is dif- ferent from that of conventional walls, and the masonry retaining wall can be regarded as a solid foundation as long as reinforced retaining wall is high enough. Moreover, the deformation of this composite structure mainly occurs in the construction period, so enough attention should be paid to controlling the construction quality.