高拱坝坝踵应力实测与计算的比较研究

发布时间：2018-04-03 15:20

本文选题：高拱坝　切入点：坝踵应力　出处：《水力发电学报》2017年12期

【摘要】：高拱坝坝踵应力状态是评价大坝安全可靠性的重要指标。由于拱坝超静定结构特性,施工期坝体升高、运行期水位变化及内外部温度变化等影响因素,致使坝踵应力分布及其变化过程极其复杂。安全监测和数值计算是获取坝踵应力的两种主要方法,然而两方法获取的数值往往并不一致,甚至还存在矛盾。本文论述了实测方法和计算方法对坝踵应力评价的影响;针对安全监测,分析了压应力计、应变计组工作原理,提出了坝踵有效应力评估、增设渗压计、压应力计和应变计组对应布置的建议;针对数值分析,研究了精细网格下坝踵等效应力与沿坝厚网格精度的关系,提出了计算拱坝坝踵应力的网格剖分的建议;两方法可有其自身影响因素,改进后的实测方法结合高精度数值计算可为评估高拱坝坝踵应力提供可靠依据。
[Abstract]:Stress state of high arch dam heel is an important index to evaluate dam safety reliability.Due to the characteristics of statically indeterminate structure of arch dam, the increase of dam body during construction period, the change of water level during operation and the change of internal and external temperature, the stress distribution and variation process of dam heel are extremely complicated.Safety monitoring and numerical calculation are two main methods to obtain the stress of dam heel. However, the values obtained by the two methods are often inconsistent or even contradictory.In this paper, the influence of measured method and calculation method on stress evaluation of dam heel is discussed, the working principle of pressure stress meter and strain gauge group is analyzed for safety monitoring, and the effective stress assessment of dam heel is put forward, and the seepage pressure meter is added.According to the numerical analysis, the relationship between the equivalent stress of the dam heel and the precision of the grid along the dam thickness is studied, and the suggestion of grid division for calculating the stress of the arch dam heel is put forward.The two methods can have their own influence factors. The improved method combined with high precision numerical calculation can provide a reliable basis for evaluating the stress of high arch dam heel.
【作者单位】：中国电力建设集团有限公司;水电水利规划设计总院;中国电建昆明勘测设计研究院有限公司;中国水利水电科学研究院;
【分类号】：TV642.4

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