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护管挡墙受洪水冲刷破坏是沿河管道水工保护结构(护管挡墙)水毁的主要类型。针对目前工程中遇到的弯曲河道处重力式护管挡墙在洪水冲刷下的破坏现象,根据护管挡墙的结构特征和实际受力状态,综合考虑洪水冲刷、挡墙基底浮托力、渗透压力、墙底侧向淘蚀深度以及洪水水位骤降幅度等因素,导出护管挡墙受洪水冲刷稳定性系数和墙底侧向极限淘蚀宽度计算式,并探讨和分析各相关因素对挡墙稳定性的影响。结果表明:墙前受洪水离心作用使挡墙在洪水水位缓慢上涨期间向河内水平滑移失效的可能性降低,挡墙基底浮拖力、渗透压力和墙底侧向淘蚀等均使挡墙倾覆失效可能性增大,挡墙前后水位差大小与挡土墙抗倾覆能力呈非正比关系。文中所导公式及分析思路和方法能适用于沿河重力式护管挡墙稳定性分析,可为类似工程问题的设计与研究提供理论参考。
Hose retaining wall washed away by flood erosion is along the river pipeline protection structure (retaining wall) the main type of water damage. According to the structural characteristics of the retaining wall and the actual stress state, considering the damage phenomenon of the gravity retaining wall at the curved riverway under flood erosion, considering the flood scouring, the basement retaining force of the retaining wall, The infiltration pressure, the lateral erosion depth of the wall and the sudden drop of the flood water level, the stability coefficient of flood retaining wall and the lateral erosion width of the bottom wall are derived and the relevant factors are discussed and analyzed. Impact of retaining wall stability. The results show that the centrifugal force on the front of the wall makes the wall less likely to slide horizontally to the river level when the flood wall slowly rises. The floating force, infiltration pressure and lateral erosion of the wall of the retaining wall all make the retaining wall The probability of capsizing failure increases, and the water level difference between the retaining wall and the retaining wall is non-proportional. The formulas and analytical ideas and methods described in this paper can be applied to the stability analysis of the retaining wall along the river gravity, which can provide theoretical reference for the design and research of similar engineering problems.