砂土条件下加筋土挡墙模型试验研究

Loading test of reinforced earth retaining wall model with sandy soil

加筋土挡墙是利用加筋土技术修建的一种柔性支挡结构,因其具有造价低、占地少、外形美观、施工方便等特点而得到广泛应用。加筋土挡墙中筋带与土的作用机理为摩擦加筋原理,能显著提高土的力学性能,特别是对于砂土,黏聚力极低,一般无抗拉强度,通过加筋后砂土的稳定性极大提高。此次试验研究以标准纸板为面板,牛皮纸作筋带,砂土作为墙后填料,根据胡克定律合理设计出牛皮纸筋带的使用量、铺设位置以及与面板的粘结方式,采用极限平衡法对静止土压力进行分析,依据规范和实践经验设计出最优加筋土挡墙模型,并进行模型加载试验、试验结果分析和模型改进工作,以减少筋带使用量,达到更加安全、经济的目的。

Reinforced earth retaining wall is a kind of reinforced earth retaining. It is widely used because of construction. The mechanism of bar strip and soil in flexible structure which uses the technique of the low cost, good feature, and convenience of reinforced earth retaining wall is the friction reinforcement principle which can improve the mechanic ability of soil, especially for sand with low cohesion and almost no tensile strength. So its ability can be improved a lot after adding reinforced bar. A standard paper board is used as front panel and the Kraft paper as the bar strip, according to the Hook＇s law reasonable design on Kraft paper＇s using quantity, laying position and the caking way with front panel. Analysis is made on earth pressure at rest by using the limit equilibrium method. An optimized reinforced earth retaining wall nodel is designed based on specification and practice, which can improve the model, reduce the use of bar strip in order to be more economical and ensure the high stability of reinforced earth retaining wall.