加筋土挡墙的现场测试与分析

The Field Measurements and Analysis of a Reinforced Earth Retaining Wall

在粘性土填料的情况下,通过8m高加筋土挡墙的土压力、拉筋受力、墙面位移等现场测试,得到了土压力沿墙高的分布为线性的,并出现了土压力零点。另外,拉筋受力最大值的各点连接而成的线基本上是一条曲线,其下端与墙面夹角约为40.76°,接近于45°-2/φ=38.73°,曲线与填土表面交界处离墙面约为5.5m,比一般认为的0.3H大。筋条与土之间的摩擦力同上覆土压力呈线性关系。这些测试成果,对今后加筋土挡墙设计具有一定的指导意义。

In this paper, the measured result of earth, pressure and wall displacement etc. for a reinforced earth retaining wall of 8m height with cohesive backfill are presented. Nonlinear distribution of earth pressure along wall height and point of zero pressure are shown, while locus of points of maximum pulling force in reinforcing strips is fundamentally a curved line with an anagle between this line and the wall of 40.76°, which is nearly the value of 45°-φ/2. The distance fron the wall of the intersection of this line and the top of beckfill is roughly 5.5m, which is much larger than the value 0.3H as generally balieved. The friction between the reinforced strip and the backfill material is linearly correlated to the overburden stress.