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随着我国水电资源的大力开发,高坝建设日益增多,面对这些大规模的建设,拱坝的稳定问题成为拱坝设计中的关键重大问题。对于处在高地应力河谷的拱坝建设,由于开挖,地应力释放引起基础岩体卸荷,造成的浅层稳定问题,对高坝设计来说是个少有成例的问题。对此问题,如果采用概念不对,误导了计算,则将引入失误。对高拱坝建基面浅层卸荷特征、产生机制进行详细讨论,结合小湾高拱坝遇到的浅层稳定问题,提出了拱坝多余力,及浅层建基面面安全系数的求法,利用最大最小原理对小湾拱坝建基面浅层稳定进行分析评价,分析结果在小湾工程的设计中得到应用,文中提出的分析方法可以指导同类工程的设计。
With the vigorous development of hydropower resources in our country, the construction of high dam is increasing day by day. In the face of these large-scale construction, the stability problem of arch dam has become the key issue in arch dam design. For the construction of an arch dam in a valley with high ground stress, the shallow stability problem caused by the unloading of the ground rock due to the excavation and the release of in-situ stress is a rare problem for the dam design. This problem, if the concept of wrong, misleading the calculation, it will introduce mistakes. In this paper, the shallow unloading characteristics and mechanism of the high arch dam are discussed in detail. Combined with the shallow stability problems encountered by the Xiaowan high arch dam, the excess force of the arch dam and the safety coefficient of the shallow foundation are proposed The method of maximum and minimum is used to analyze and evaluate the stability of shallow foundations of Xiaowan arch dam. The analysis results are applied in the design of Xiaowan project. The analysis methods proposed in this paper can guide the design of similar projects.