Abstract

For high cutting slopes, it is quite necessary to set pre-reinforced structures before the slope excavation to avoid the slope failure during the excavating. In this paper, the multi-wedge translation mechanism is used to analyze the stability of high cutting slopes pre-reinforced with piles. First, the multivariate functions are established to calculate safety factor for the slope during the excavating. Based on the safety factor of the slope during the excavating process, it can be determined that whether the slope need set the pre-reinforced piles before excavating. If need, the most significant factor for pre-reinforced pile design is the stabilising force. Then the expressions are derived to calculate the stabilising force provided by the pre-reinforced piles to increase the safety factor to assure the high cutting slope is stable. At last, an example is taken to illustrate the method proposed in this study. The result shows that the safety factor for the slope is change with the excavating. The stabilising force is influenced by the location of pre-reinforced piles, excavation distance and slope angle. The most suitable location of pre-reinforced piles within the high cutting slope also had been determined.

摘要

对于高路堑边坡，在边坡开挖前设置预加筋结构是十分必要的，以避免边坡在开挖过程中发生破坏。本文采用多楔平动机构对桩预加固高路堑边坡稳定性进行分析。首先，建立多变量函数来计算开挖过程中边坡的安全系数。根据边坡在开挖过程中的安全系数，可以确定边坡是否需要在开挖前设置预加固桩。如果需要，预加固桩设计最重要的因素是稳定力。然后推导计算预加固桩提供的稳定力增加安全系数保证高路堑边坡稳定的表达式。终于，举例说明本研究提出的方法。结果表明边坡的安全系数随开挖而变化。稳定力受预加固桩的位置、开挖距离和坡度的影响。预加固桩在高路堑边坡内的最合适位置也已确定。