大沙河尾矿库扩容工程坝体加固设计与稳定性分析

Stability Analysis and Heightening Design of the Dashahe Tailings Dam Expansion Engineering

以大沙河尾矿库为工程背景,采用数值模拟反演分析得到现状和加高后不同工况下的浸润线,对现状下和加高后坝体的稳定性进行了计算并提出相应的加固措施。结果表明,反演分析得到的浸润线与实际情况较为一致,可以运用到不同条件下坝体稳定性分析中;现状下和加高后坝体在正常工况和洪水工况运行的安全系数均满足规范要求,特殊工况下安全系数均不满足规范要求;依据现场的实际情况,对坝体采取水平排渗和块石贴坡加固措施后,3种工况下坝体安全系数均满足规范要求,验证了该加固措施的有效性。

Taking the Dashahe tailings dam as the engineering background,the numerical simulation back analysis is used to obtain the saturation line under the current situation and different working conditions after heightening.The stability of the dam under the current situation and the heightening is calculated and the corresponding reinforcement measures are proposed.The results show that the saturation line obtained by the inversion analysis is consistent with the actual situation and can be applied to the stability analysis of the dam under different conditions.The safety factor of the dam under normal conditions and flood conditions after the current and elevated conditions satisfy the requirements of the specification,the safety factor under special working conditions does not meet the requirements of the specification;according to the actual situation of the site,after the horizontal drainage and the stone-slope reinforcement measures are adopted for the dam body,the safety factors of the dam are all met under the three conditions.It verifies the effectiveness of the reinforcement.