二郎山滑坡坡脚挡墙破坏及修复技术研究

Analysis of retaining wall destruction at landslide slope toe of Erlang mountain and reconstruction technology

二郎山1号滑坡位于龙胆溪左岸,滑坡前缘采用了坡脚挡墙防冲刷工程,10 a之后位于龙胆溪凹岸部分坡脚挡墙破坏。针对坡脚挡墙破坏形成的原因,对比分析了目前常用冲刷防护结构的局限性,提出了采用台坎式挡墙新组合结构进行修复,组合结构主要由挡土墙、墙底抗滑键、墙脚台坎以及耐磨肋组成。介绍了组合结构设计计算方法,并通过造价分析说明台坎式挡墙结构与其它防冲刷相比在经济上具有明显优越性,可为其它同类地质灾害防治提供参考。

No. 1 landslide of Erlang mountain is located on the left bank of Longdanxi creek. Slope retaining wall was construc-ted to prevent scouring in the front of the landslide, and part of the slope retaining wall at the creek concave bank was damaged after 10 years^operation. Aiming at the damage causes of the slope retaining wall, and in combination with the limitations of cur-rent scouring protection structures, a new composite structure of sill retaining wall was put forward, which is mainly composed of a retaining wall, anti - sliding key at the wall bottom, the sill at slope toe and the wear berm ribs. The design and calculation method of composite structure is introduced, and it is pointed out that the sill retaining wall structure has obvious superiority in e-conomy through the cost comparison of different retaining wall structures.