水电站边坡稳定性及桩基托梁结构优化分析

Analysis on Slope Stability and Pile Foundation Joist Structure Optimization in Hydropower Station

鉴于传统的桩基托梁设计理论无法完全解决高填方桩基托梁支挡水电站边坡稳定性的问题,文章以大华桥水电站5号公路桩基托梁支挡边坡为例,通过有限元数值模拟方法对其进行了稳定性计算及桩长优化分析。研究结果表明:随着桩长的增加,潜在滑面逐渐向坡体深部发展,边坡安全系数得以提高;从有限元计算结果来看,当桩长为20m时,对应的边坡安全系数为1.65。综合考虑建议桩长可取到14m以上。所得结论对今后类似工程具有参考和借鉴价值。

Dahuaqiao Hydropower Station No.5 highway pile foundation joist supporting slope is adopted as an example in the paper since the traditional design theory of pile foundation joist can not be applied for completely solving the problem of slope stability in the high-fill pile foundation joist supporting hydropower station.The finite element numerical simulation method is applied for stability calculation and pile length optimization analysis.The research results show that the potential sliding surface is gradually developed to the deep part of the slope with the increase of the pile length,and the slope safety coefficient can be improved.The finite element calculation results show that the corresponding slope safety coefficient is 1.65 when the pile length is 20m.It is suggested that the pile length should be more than 14m after comprehensive consideration.The conclusion is of great reference value to similar projects in the future.