某水库大坝稳定复核

The Stability Calculation of Dam of a Certain Reservoir

文中主要介绍了某水库大坝稳定的计算过程,包括断面选取、计算软件说明、土力学参数采取大坝分区后参数、工况选取及计算方法:稳定渗流期采用正常蓄水位,有效应力法计算;水位降落期根据实际运行期最大降幅和最大降速作为最不利工况,采用有效应力法和总应力法同时计算,取小值作为大坝的稳定安全系数,结果表明Ⅷ度时坝体在水位降落期上游坝坡不稳定,下一步应进行除险加固。同时,还对滑弧经过的土区进行敏感性分析,研究C、φ值变化时,坝坡稳定安全系数变化情况。

This paper mainly introduces the calculation process of dam stability of a certain reservoir,including cross section selection,calculation software description,soil mechanics parameters after dam zoning,working condition selection.The normal storage water level is adopted in stable seepage period,and effective stress method is used to calculate.According to the situation in the actual operation period,the maximum drop and maximum speed of the water level drop in the actual operation period are adopted as the most unfavorable working condition,the effective stress method and the total stress method are used to calculate at the same time,and the small values are taken as the stability safety factor of the dam.The results show that the upstream dam slope is unstable during the water level drop period during the 8-degree earthquake,and the next step should be taken to eliminate danger and strengthen it.At the same time,the sensitivity analysis of the soil area passed by the sliding arc is carried out to study the change of the safety factor of dam slope stability with the change of C andΦvalues.