土石坝砂岩压重除险加固处理坝坡稳定性分析

Analysis of Slope Stability of Earth Rock Dam under Reinforcement by Sandstone Pressure Treatment

针对松坡水库均质土坝上游坝坡失稳问题,采用砂岩压重加固方案进行病险处理,并对加固前后大坝坝坡稳定性和稳定渗流期的浸润线及滑裂面分布进行论证分析。结果表明,与加固前相比,大坝加固后各工况条件下的安全系数有明显增加且均满足规范指标要求,坝坡稳定性得到全面提高。加固后,坝体内浸润线分布未发生明显改变,而滑裂面剪出口得到明显抬升,坝坡失稳概率大幅降低,加固修复效果显著。

Aiming at the problem of instability at homogeneous earth dam upstream dam slope of Songpo reservoir,the reinforcement scheme by sandstone pressure treatment has been done,and the dam slope stability before and after reinforcement,the phreatic line and slip surface distribution during the stable seepage period has also been demonstrated and analyzed.The results show that compared with the before reinforcement situation,the dam safety factor under various working conditions after reinforcement is significantly increased and all can meet the specifications requirements,and the dam slope stability has been comprehensively improved.After reinforcement,although the distribution of phreatic line in the dam body has not changed significantly,while the shear outlet of sliding crack surface has been raised significantly,and the probability rate of dam slope instability has been greatly reduced which obtain significant effect of reinforcement and repair.