渗流作用下仰斜式挡土墙的主动土压力分析

李海鹏

摘要:

库伦理论(包括库伦理论的补充公式)均未考虑渗流作用,而渗流力本来就是一种体积力,本文对静力模型进行补充,考虑了渗流力的影响,对于重力、荷载、滑面阻力(粘聚力、摩擦力)、挡墙反力、渗流力,这些力不同的排列组合会产生不同的静力模型。在多重静力组合中筛查,给出了一种最简洁的便于分析的静力平衡模型。运用该静力平衡模型,可以分析渗流力的变化规律。本文选择2个工程实例,结果表明在当墙顶坡面坡度较小时(如2°),渗流对挡墙的作用不明显。随着墙顶坡面坡度的增加(如10°),渗流对挡墙的作用力影响显著增加。

Abstract:

The Coulomb theory (including the supplementary formula of Coulomb theory) does not consider the seepage effect, and the seepage force is originally a kind of volumetric force. This paper supplements the static model and considers the influence of seepage force. For gravity, load, sliding surface resistance (cohesion, friction), retaining wall reaction and seepage force, the different arrangement and combination of these forces will produce different static models. In the multi static combination, a most concise static equilibrium model for analysis is given. Using the static equilibrium model, the variation law of seepage force can be analyzed. Two engineering examples are selected in this paper. The results show that when the slope of the wall top is small (such as 2 °), the effect of seepage on the retaining wall is not obvious. With the increase of the slope gradient of the wall top (such as 10 °), the influence of seepage on the acting force of the retaining wall increases significantly.