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针对含软弱夹层的层状岩基重力坝深层抗滑稳定问题,在分析层状岩基的深层失稳模式的基础上,提出了深层滑动面的自动搜索方案,并利用刚体极限平衡法研究了软弱夹层的埋置深度、位置及倾角对深层抗滑稳定安全系数的影响规律,进而利用深层滑动面搜索方法分析了向家坝水电站左非~#3坝段坝基的深层抗滑稳定性。结果表明,左非~#3坝段坝基深层抗滑失稳模式为坝踵岩层断裂滑移模式,在正常蓄水状态下该坝基深层抗滑稳定性满足规范要求。
Aiming at the deep anti-sliding stability of layered rockfill dam with weak interlayer, based on the analysis of the deep failure mode of layered rockfill foundation, an automatic search scheme of deep sliding surface is proposed. By using rigid body limit equilibrium method, The effect of embedment depth, position and dip of soft interlayer on the safety factor of deep anti-sliding stability is analyzed, and then the deep anti-sliding stability of dam foundation of No.3 dam of Xiangjiaba Hydropower Station is analyzed by the deep sliding surface search method. The results show that the deep anti-slip failure mode of dam foundation at No.3 dam is dam-slip fracture rupture mode, and the stability of deep anti-slide dam under normal water storage conditions meets the requirements of the code.