考虑垫层减压效果后过水土石坝（围堰）下游坡混凝土护板的稳定分析

The Stability Analysis of the Downstream Concrete Slab Protection Slop of Overflow Earth and Rock Dam(Cofferdam)after Considering the Decreasing Pressure Effect of Beding Course

根据试验资料，先用曲线拟合最小二乘法推导出了考虑垫层减压影响的计算混凝土护板下测压管水头压力的经验公式。然后，在此基础上提出了在不同失稳条件下护板的稳定分析计算公式。最后，通过理论计算与试验结果的比较，验证了这些公式的实用价值，并表明垫层经适当的设计后，其减压作用可减小板厚和节省工程投资。

In this paper,first,according to experimental data,an experience formula after considering the be-ding course's decreasing pressure effect to calculate the piezometric head pressure underneath concrete pro-tection slab is derived with curve fitting least square method.Then,based on it,some stability analyses'calcu-lation formulas of the concrete protection slab under defferent loss stability conditions are put forward.ast,comparing theoretical calculation with experimental result,tests and verifies these formulas'using value and shows the important significance of the decreasing pressure function of the beding course through suitable de-sign to cut down concrete protection slab's thickness and project invest.