根据岩石渗透系数反演结果,采用三维渗流有限元方法分析了白山水电站水垫塘增设后在4种不同上下游水位条件下坝基扬压力的变化。数值计算表明,在水垫塘排水系统有效情况下,水垫塘不会引起坝基扬压力的增加;当水垫塘排水系统失效时,如果不在护底处设置排水孔将会引起坝基扬压力的增加。根据有限元渗流场计算结果,提出了降低坝基扬压力的技术措施。 According to the inversion results of rock permeability coefficient, the three-dimensional seepage finite element method is used to analyze the change of the foundation pressure under the four different upstream and downstream water levels after the addition of the plunge pool in Baishan Hydropower Station. The numerical calculation shows that when the plunge pool drainage system is effective, the plunge pool will not cause the increase of the bulge pressure. If the plunge pool drainage system fails, increase. According to the finite element seepage field calculation results, the technical measures to reduce the pressure of the dam foundation are put forward.