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在深厚覆盖层地基上建坝,对于坝体和地基渗透稳定及渗流量的控制格外关键。针对深厚覆盖层地基,推求了二维渗流场的有限元计算格式,编写程序对工程实例进行有限元数值分析。工程实例分析表明,对于渗透系数较大的深厚覆盖层地基,只有当防渗墙完全封闭覆盖层才能取得良好的防渗效果;当深厚覆盖层的渗透系数较大时,单纯依靠延长铺盖的长度并不能有效的控制渗漏量;防渗墙未达到相对不透水层之前,覆盖层的渗透性对渗漏量起着控制作用。
The construction of a dam on a deep overburden foundation is particularly critical for the control of the seepage and stability of the dam and foundations. According to the deep overburden foundation, the finite element calculation formula of two-dimensional seepage field is deduced, and the program is compiled to carry out the finite element numerical analysis of the engineering example. The engineering example shows that for the deep foundation with large permeability coefficient, the seepage control effect can be obtained only when the impermeable wall is completely closed. When the permeability coefficient of the deep cover is large, And can not effectively control the amount of leakage; seepage wall does not reach the relatively impermeable layer before the permeability of the cover plays a controlling role on the amount of leakage.