土体自稳坡角和土钉墙稳定机理分析

Soil Self-stabilizing Angle and Stability Mechanism of Soil Nail Walls

利用经典的上界定理,推导出土体自稳临界坡角计算式,提出了以相对坡角作为指标评判边坡稳定性的方法。除了已知的与土钉墙整体稳定相关的潜在滑动面外(第二滑动面),首次证明了主动区中还可能存在以土体自稳临界坡角决定的滑动面(第一滑动面)。实际工程应用验证了所提出方法的合理性。研究成果揭示了土体滑动机理,提供了评判边坡和土钉墙稳定的一条新途径。

The formula of determining the critical angle of soil self-stabilizing is deduced based on upper bound theorem.A new method is presented to evaluate slope stability by using the ratio of soil self-stabilizing angle to slope angle.In addition to the known second slip surface,which is the potential slip surface involving the overall stability,a new slip surface,namely the first slip surface is testified to possibly exist in the active zones of soil nail walls for the first time.This slip surface is determined by soil self-stabilizing angle.A series of case studies have validated the method proposed in this study.This research reveals the mechanism of soil slide,and provides a new approach of determining the stability of slope and soil-nail wall.