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针对坝基深层抗滑稳定分析中滑动面上扬压力通常出于安全考虑只在排水孔处折减,未考虑防渗帷幕的防渗减压作用对深层抗滑稳定造成的影响,引入当量长度及附加阻抗概念分析了帷幕与排水孔的减压效果,以及二者联合作用下的减压效果,并将其应用到实际工程中。结果表明,二者联合作用得出的滑动面上扬压力较防渗帷幕与排水孔单独作用更为精确,更贴近工程实际,较好地反映了深层抗滑稳定安全性。
In view of the stability analysis of the deep foundation in dam foundation, the uplift pressure of the sliding surface is usually reduced only at the drainage hole for safety reasons. The effect of anti-seepage and anti-pressure effect of anti-seepage curtain on deep anti-sliding stability is not considered. Impedance concept Analysis of the curtain and drainage hole decompression effect, as well as the combined effect of decompression under both, and its application to the actual project. The results show that the sliding surface uplift pressure obtained by the combined effect of the two is more accurate than the seepage curtain and drainage hole alone, which is closer to the engineering practice and better reflects the safety of the deep anti-sliding stability.