摘要
官地水电站原先采用宽戗堤截流方案，其截流流量大且龙口底部流速高，龙口河床冲刷严重，不利堤头稳定；后来比较双戗堤截流方案，由于上戗堤水舌的影响，下戗堤堤头坍塌严重，截流也难以实施。为此，提出采用单戗堤预进占护底方案，提高导流洞分流能力和对戗堤附近河床进行保护，从而可降低截流难度。模型试验表明，预进占护底对降低其截流难度作用是明显的。
Wide-dike closure was formerly used in Guandi Hydropower Station, but the closure discharge and the bottom velocity were large, the bed of closure gap was scoured seriously, so that the stability of dike was affected.. Later, the double-dike closure scheme was proposed. However, due to the influence of upper dike water jets, the dike head of lower dike collapsed seriously, and it was difficult to implement the closure of this project. Therefore, the single-dike pre-advanced bed protection was proposed to improve the diverting capacity of diversion tunnel and protect the river-bed, so as to lower the difficulty of closure. The model test showed that the bed protection can obviously lower the difficulty of river closure in Guandi Hydropower Station.
关键词
官地水电站
施工截流
预进占护底
Guandi Hydropower Station
construction closure
pre-advanced bed protection
