抽水蓄能电站中转料场三维渗流模拟研究

Three-dimensional seepage simulation study of the transfer stockyard in pumped storage power station

抽水蓄能电站的建设对提高能源利用效率发挥了关键作用,分析其中转料场的渗流变化对预判工程风险和确保工程安全具有重大意义。为此,以浙江某抽水蓄能电站下库弃渣场为例,依据场区现场的地质调查建立真实可靠的地质模型,采用三维有限元法进行数值模拟,分析暴雨频率、渣场渗透系数和土层厚度等因素对弃渣场渗流分布的影响。结果表明:在不同暴雨频率中,相同降雨历时条件下的地下水出露高程变化幅度稳定;随着暴雨强度的增加,地下水位埋深的变化幅度和孔隙水压力变化幅度逐渐增大,从而增加失稳风险;渣场中的局部饱和区域分布复杂,土层较薄且渗透系数较大的区域更易形成局部饱和。研究成果为类似弃渣场的整体安全和风险评估提供了参考。

The construction of pumped storage power stations plays a crucial role in balancing grid load and improving energy utilization efficiency,analyzing the seepage changes in the transfer stockyards is of great significance for predicting possible engineering risks and ensuring engineering safety.Therefore,taking the spoil disposal site of the lower reservoir of a pumped storage power station in Zhejiang as an example,a real and reliable geological model was established based on the on-site geological survey of the site area.The three-dimensional finite element method was used for numerical simulation to analyze the influence of factors such as rainstorm frequency,seepage coefficient of the spoil disposal site and soil layer thickness on the seepage distribution of the spoil disposal site.The results show that under different rainstorm frequencies and the same rainfall duration,the variation range of the groundwater emergence elevation is stable;as the intensity of the rainstorm increases,the variation range of the groundwater table depth and the variation range of the pore water pressure also increase,thereby increasing the risk of instability;the distribution of local saturated areas in the spoil disposal site is complex,and areas with thinner soil layers and larger permeability coefficients are more likely to form local saturation.The research results provide an important reference for the overall safety and risk assessment of similar spoil disposal sites.