三峡大坝3坝段深层抗滑稳定分析

发布时间：2018-06-09 17:07

本文选题：三峡大坝 + 深层抗滑稳定　；参考：《中国科学:技术科学》2017年08期

【摘要】：三峡工程混凝土重力坝左岸1~5#坝段深层抗滑稳定是三峡工程水工设计关键技术难题之一.其中节理在主滑方向的连通率是确定强度指标的决定性因素.本文作者研究团队通过现场实测的近2000条节理产状几何参数和相应网络模拟技术,获得了在主滑方向的连通率为70%左右的结论;证明了上限解(即Sarma法)和规范规定的"等K法"的等效性,从而将双滑面模式扩展为更具广泛实用意义的折线型滑面的二维抗滑稳定分析方法;同时进行了可靠指标和分项系数方法的计算.抗滑稳定分析成果表明,如果坝体单独抗滑,设计要求复核的两种滑移模式均无法满足允许安全系数规定值.如果厂、坝联合受力,则相应两种滑移模式的安全系数均达到了允许值.上述研究成果为1~5#坝段的设计提供了合理性依据.本文介绍蓄水后1~5#坝段原型观测成果,以验证相关研究成果.
[Abstract]:The deep anti sliding stability of the 1~5# dam section on the left bank of the concrete gravity dam of the Three Gorges project is one of the key technical problems in the hydraulic design of the Three Gorges Project. The connectivity rate of the joint in the direction of the main sliding is the decisive factor to determine the strength index. In this paper, the authors study the geometric parameters of the near 2000 joints and the corresponding network simulation techniques measured by the authors in the field. The conclusion is obtained that the connectivity rate is about 70% in the main sliding direction, and the equivalent of the upper bound solution (Sarma method) and the standard "equal K" method are proved, thus the double slip surface model is extended to a two dimensional anti sliding stability analysis method of a more widely practical folding type slip surface, and the calculation of the reliability index and the fractional coefficient method is also carried out. The results of the anti sliding stability analysis show that if the dam body is anti sliding alone, the two slip modes that are designed for rechecking are unable to meet the allowable safety factor. If the joint force of the dam and the dam is combined, the corresponding safety factors of the corresponding two slip modes have reached the allowable value. The above research results provide a reasonable basis for the design of the 1~5# dam section. The prototype observation results of 1~5# dam after impoundment are introduced to verify relevant research results.
【作者单位】：流域水循环模拟与调控国家重点实验室;中国水利水电科学研究院;
【分类号】：TV223

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