物质点法在边坡稳定性评价中的应用研究

Slope failure analysis using the material point method

边坡的稳定性评价应当不仅仅局限于边坡的初始失稳破坏评价,也应该包括边坡发生破坏后坡体形态的发展以及最终的平衡状态评价,因为它对于描述滑坡造成的危害更为直观。鉴于此,结合物质点方法开发过程中的一些最新进展进行简要介绍,包括隐式物质点方法、随机物质点方法以及考虑流–固全耦合的物质点方法,同时对其在不同工况下的边坡稳定性评价进行了应用与探讨,揭露了边坡相应工况下不同的破坏机制和模式,包括降雨引起的浅层破坏、斜长边坡的平动破坏以及黏土体常见的向上渐进式转动破坏等。研究结果表明,该方法可以稳定、高效地评价边坡的初始破坏以及诱发的众多次生破坏,直观深入地描述边坡的破坏机制以及评估破坏带来的风险。

A complete description of slope failure should not only be limited to the failure initiation,but also include the development of slope failure and the final configuration of the slope. This paper introduces a new framework of material point method（MPM） proposed by the authors,including implicit MPM,random MPM and coupled MPM. A series of simple slope simulations under different scenarios are shown,demonstrating the ability of the proposed methods in simulating the observed failure modes and corresponding failure mechanisms,including progressive,retrogressive and superficial failures due to the rainfall infiltrations,etc. The MPM is shown to be a reliable tool in capturing the large deformations of slopes,including the initial failure and the induced secondary failures,thereby,providing a solid basis for the risk analysis of the slope failures.