填土斜坡的排水条件对斜坡稳定性的影响

降雨是导致斜坡破坏的主要原因。地下水位上升和在土中渗流引起土体应力状态的变化是导致斜坡在降雨过程中或降雨后变形与破坏的关键因素。填土斜坡的稳定性不仅取决于填土的强度，还与填土斜坡的排水条件密切相关。适当的排水条件不仅可以限制斜坡中地下水位上升的高度，而且可以及时消散因材料剪切收缩而生成的超孔隙水压力，防止土体液化，避免斜坡整体流动破坏。本文采用完全耦合有效应力分析程序和与状态相关的剪胀性砂土模型模拟地下水位上升过程中填土排水条件对压实填土斜坡稳定性的影响。完全耦合有效应力分析方法可以模拟孔隙水和土骨架间包括浮力和渗流在内的相互作用。分析结果表明斜坡排水条件是影响斜坡因地下水位上升而变形和破坏的重要因素，加固松散填土斜坡时必须设置适当的排水与泄水装置。

Effect of drainage condition of compacted fill slope on slope stability

Rainfall is the most important cause of slope failure. The variation in stress state of soils due to rise of groundwater level and seepage of groundwater is critical to the deformation and failure of slopes during and after heavy rainfall. The stability of fill slope depends not only on the strength of fill material but also the drainage condition of the slope. Proper drainage control can not only limit the height of groundwater level, but also dissipate the build-up of excess pore pressure caused by shearing-induced contraction of soil. The possibility of liquefaction and flow failure of fill slope can be reduced consequently. The performance of compacted fill slope during rise of groundwater level is investigated by using a fully coupled procedure and the state-dependent dilatancy sand model. The interaction between pore water and soil skeleton including both buoyancy and seepage effects can be precisely taken into account in a fully coupled effective stress approach. The influence of the drainage condition of compacted fill on the stability of slope is examined. The analytical result indicates that the drainage condition in a compacted fill slope plays an important role in controlling the deformation of slope during and after heavy rainfall. Proper drainage control must be provided in remediation of loose fill slopes.