高拱坝陡坡坝段接触灌浆指标敏感性分析

Sensitivity analysis of contact grouting indicators in steep section of high arch dam

针对高拱坝陡坡坝段接触灌浆过程中可能出现的抬动及失稳等现象,采用考虑弹性约束的坝体抬动三维有限元仿真分析方法,通过反演基岩对坝体的弹性约束系数,对坝体盖重及接触灌浆压力等灌浆指标进行敏感性分析。仿真结果表明,增加坝体盖重对减小坝体抬动和水平位移、增加陡坡坝段的稳定性效果显著;而过大灌浆压力易导致坝体产生明显抬动和水平位移,甚至出现坝体失稳。

Lifting and instability may occur in the process of contact grouting in steep section of high arch dam.Using three-dimensional finite element method and considering the elastic constraint between dam and bedrock,we inverse the elastic constraint coefficient,and analyze the sensitivity of concrete cover height and grouting pressure.The results show that excessive grouting pressure can easily lead to lifting or even failure of dam section,while increasing the cover height can reduce the lifting and horizontal displacement,and increase the stability of the dam section.