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地基条件对重力坝坝体应力有较大的影响,对这一问题的分析研究至今还是不够的。目前在重力坝设计中,仍主要采用比较简单的材料力学方法。这种方法既不考虑地基的作用,也不考虑坝踵和坝趾的应力集中,结果算出的坝体应力,在1/3坝高范围内与实际情况有较大出入。为此,本文对岩基上的重力坝,采用平面有限元法计算分析了地基条件对坝体应力的影响。所考虑的地基条件包括地基渗流、地基自重、地基刚度和坝踵裂缝开展。计算分析系结合一项生产任务进行的。计算实例坝高112米,网格布置如图1所示。计算时坝体作为平面应力问题,地基作为平面应变问题。
The foundation conditions have a great influence on the stress of gravity dam body, and the analysis and research on this issue is still not enough. At present, in the design of gravity dam, still relatively simple method of mechanics of materials is mainly used. This method does not consider the role of the foundation, and does not consider the dam and the toe of the stress concentration, as a result of calculating the dam stress, in the 1/3 dam height with the actual situation there is a greater discrepancy. Therefore, in this paper, the influence of foundation conditions on the dam stress is analyzed and calculated by using the plane finite element method. The foundation conditions considered include foundation seepage, foundation weight, foundation stiffness and heel crack initiation. Computational analysis is done in conjunction with a production task. Calculation example 112 meters high dam, grid layout shown in Figure 1. When calculating the dam as a plane stress problem, the foundation as a plane strain problem.