新型截水导流式锚拉桩板墙排水抗滑性能分析

Research on performance of drainage and anti-sliding of anchored plate-pile retaining wall with cut-off diversion

降雨渗流和地下水对边坡稳定性影响巨大,而传统坡内排水设施受地质条件影响突出,难以满足巨型滑坡的排水要求。针对大型边坡地质条件复杂、排水能力不足的问题,提出截水导流式锚拉桩板墙。基于FLAC 3D中的流-固耦合理论模块,对传统滑坡支挡结构(泄水隧洞+抗滑桩)和截水导流式锚拉桩板墙支护下坡体与结构应力、位移、锚索轴力以及排水量等方面进行对比分析。研究表明,新型结构长期排水性能较好,坡体最大剪应力、结构的最大剪应力和最大位移以及锚索最大轴力均低于传统结构显示了新型结构的优越性。截水导流式锚拉桩板墙有利于坡体内部排水,更有利于坡体稳定性。研究成果可为巨型滑坡治理工程提供参考。

Rainfall infiltration and groundwater have great impacts on the slope stability.Traditional slope drainage facilities are greatly affected by the geological conditions and are difficult to meet the drainage requirements of the giant landslide.In view of the complicated geological conditions and insufficient drainage capacity of giant slopes,a new integrated structure was put forward.With the fluid-solid interaction theory module in FLAC3D,we compare the slide and structural stress,displacement,anchor force and drainage quantity of traditional landslide retaining structure(anti-slide pile and drainage tunnel)and new structure,the anchored plate-pile retaining wall with cut-off diversion.The calculation results show that the new structure exhibited better performances than traditional structures on long duration drainage in the view of the maximum shear stress of slope,the maximum stress of the structures,the maximum displacement,and maximum axial force of the anchor rope,which show the superiority of the new structure.The new structure is conducive to the internal drainage of the slope and the stability of slopes.