宋农水电站混凝土重力坝断面优化设计

Optimized design of concrete gravity dam for Songnong Hydropower Station

由于层次多、倾角缓、抗剪强度较低的泥化夹层或破碎夹层广为分布,故宋农水电站混凝土重力坝基础沿缓倾角软弱夹层的深层滑动是大坝抗滑稳定要控制的重点。经多方案比较,最终采用了坝体上游设置防渗板的处理方案。该方案不仅满足了坝体强度及稳定要求,而且使坝体工程量减少了26%,且加大了溢流坝的泄流能力。此方案是较为经济安全的处理办法,解决了不良坝基的大坝深层抗滑稳定问题,而且优化了坝体断面体形。

Due to the wide distribution of argillation intermediate layers or crushed intermediate layers with more layers,gentle dip angle and lower shearing strength,the deep sliding along the weak intermediate layers under the foundation of the concrete gravity dam of Songnong Hydropower Station is the key control point for the anti-sliding stability of the dam. Through the comparison made among several schemes,the treatment scheme of arranging anti-seepage slab on the upstream of the dam body is adopted. On the basis of this scheme,not only the requirements of both the strength and stability of the dam body are met,but the construction quantity is also reduced by 26%,moreover,the discharge capacity of the overflow dam section is enlarged as well.This is an economic and safe treatment method,with which the problems from the deep anti-sliding stability of the dam are solved and the shape of the dam section is optimized as well.