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从变形和测压管水位2个方面对硗碛大坝坝基廊道纵0+168.12结构缝渗漏原因进行了分析,结果表明结构缝变形过大是造成渗漏的根本原因。对结构缝进行水溶性聚氨酯灌浆处理后,渗漏现象消失,结构缝左侧、防渗体下游的测压管水位仍与库水位相关,但呈逐年下降的趋势;采用BP神经网络模型对坝后渗流量进行分析和预报,结果表明坝后渗流量基本稳定,从而得出水溶性聚氨酯灌浆处理对于改善该结构缝的防渗性能具有明显效果,但结构缝左侧灌浆平洞上部防渗体系可能仍存在局部缺陷的结论。同时,对“防渗墙+廊道+心墙”联合防渗体系今后的观测、检测和计算分析亦提出了相应建议。
From the deformation and piezometric water level, the causes of the seepage of structural joints in longitudinal section 0 + 168.12 of the Xuanqu dam dam foundation are analyzed. The results show that the excessive structural deformation is the root cause of seepage. After the water-soluble polyurethane grouting treatment, the seepage phenomenon disappeared, the left side of the structure joint and the piezometer water level downstream of the seepage prevention body were still related to the water level of the reservoir, but the trend was declining year by year. The BP neural network model was adopted to dam The results show that the seepage flow after the dam is basically stable. It is concluded that the water-soluble polyurethane grouting treatment has a significant effect on improving the seepage prevention performance of the structural joint. However, the seepage control system at the upper part of the grouting hole on the left side of the structural joint may be There are still some local defects. At the same time, the future observation, detection and calculation analysis of “impermeable wall + corridor + core wall” joint anti-seepage system also put forward corresponding suggestions.