加筋土挡墙优化设计及破坏形式试验研究

Optimization design of reinforced earth retaining wall and its failure mode tests

加筋土挡墙是一种新型的挡墙形式,与传统的混凝土挡墙相比,具有成本低、环保、抗震性能好等优点。运用库仑土压力定理分析水平加筋土强度与稳定,对某加筋土挡墙进行设计。为验证上述优化设计方法的正确性,并探究不同情况下挡墙的破坏形式,共进行3次模型试验。通过模型试验对比分析2种不同工况下加筋土挡墙破坏形式,筋材较少时,加筋土挡墙发生位移破坏;筋材较细时,加筋土挡墙发生倾覆破坏。提出加筋土挡墙筋材合理分布形式与筋材宽度,通过上部筋材反包形式使筋材抗拉强度得到更充分的发挥。

Reinforced earth retaining wall is a new type of retaining wall. Compared to the traditional concrete retaining wall,it has the advantages of low cost,environmental protection,good seismic performance,and so on. The strength and stability of the reinforced soil were analyzed by the Coulomb soil pressure theory,and the rationality of the reinforced soil retaining wall was designed based on a practical project. In order to verify the correctness of the above optimization design method,and to explore the failure modes of retaining wall under different conditions,three model tests were conducted. Through a comparison of model test analysis under two different conditions and reinforced soil retaining wall failure modes,when the number of the steel bar was small,displacement failure occured; when the steel bar was narrow,the topping failure occured. The reasonable distribution of reinforcement material and the width of reinforcement are proposed. Enveloping the upper part of the reinforced retaining wall can effectively develop the tensile strength of the reinforced material.