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龙开口水电站坝基深槽防渗墙是电站的重要工程之一,原设计为双人字形防渗墙方案,但由于工程建设进度等原因,实际施工时改用单片防渗墙体系.针对现场施工工况,对防渗墙建立有限元模型,分析边界条件、墙体支撑及水位变化等对其承载力、应力和变形的影响.计算结果表明采用单片防渗墙体系施工时,选择合理边界条件和支撑,并严格控制墙后水位,既能满足防渗墙的承载能力和安全运行要求,又加快了工程进度,并提高了经济效益.同时,采用仅受压弹簧单元模拟土体与墙体间的连接,并根据土质情况及有限单元的大小选取合适的弹簧刚度来模拟土体与墙体的作用力,实践证明经简化的计算模型能够满足工程施工所需的计算精度要求.
Longkoukou Hydropower Station dam foundation deep groove cut-off wall is one of the important projects of the power station, the original design of the double-shaped cutoff wall plan, but due to the progress of construction and other reasons, the actual construction of single-chip cutoff wall system for site construction The finite element model is established for the impermeable wall and the influence of boundary conditions, wall support and water level on the bearing capacity, stress and deformation of the impermeable wall is analyzed. The calculation results show that the reasonable boundary Conditions and support, and strictly control the water level behind the wall, both to meet the bearing capacity of the cut-off wall and safe operation requirements, but also speed up the progress of the project, and improve economic efficiency.At the same time, using only compression spring unit to simulate the soil and wall According to the soil conditions and the finite element size, we select the appropriate spring stiffness to simulate the force between the soil and the wall. Practice has proved that the simplified calculation model can meet the calculation requirements of engineering construction.