某抽水蓄能电站高压岔管区外水压力数值模拟

Pumped Storage Power Station in a Bifurcated Pipe Zone Numerical Simulation of the External Water Pressure

水利水电工程引水发电系统建筑物均深埋在地下水位以下,外水压力较大,外水压力值的确定尤为重要。采用渗流数值法来计算某抽水蓄能电站高压岔管区的外水压力,通过实测和计算的渗压值获得了围岩灌浆圈不同岩体的渗透系数值,对电站区引水系统1充水和引水系统2充水,以及一个引水系统充水、另一个引水系统充水后放空条件下的岔管区的外水压力进行了模拟预测。计算结果表明,岔管区的外水压力与充水水位关系密切,在一水道正常运行、另一水道放空检修时,放空的水道将承受更大的外水压力。

Diversion system buildings are buried deep below the water level in water resources and hydropower engineerings with high external water pressures. The determination of this pressure value is especially vital. In this paper,seepage numerical method was used to calculate a pumped storage power station bifurcated pipe zone external water pressure,through the values we obtained permeability coefficient values in different rock rings. We simulated the external water pressures in bifurcated pipe zone through charging and discharging water of diversion system ① and ②. The results show that the external water pressure in bifurcated district has a close relation with recharging water level;the emptied waterway will tolerate greater external water pressure when one waterway is in a normal operation,and another waterway is emptying for maintenance.