基于矩法的高拱坝实际温度荷载反馈

发布时间：2019-03-17 13:55

【摘要】：温度荷载是拱坝的主要设计荷载之一,与封拱温度、环境气温、库水水温等关系密切,实际温度荷载难免与设计温度荷载存在一定差异,传统点式温度计监测数据信息量少,难以进行合理有效的拱坝温度荷载反馈。结合溪洛渡特高拱坝典型坝段分布式光纤顺河向实测温度,基于矩法进行高拱坝实际温度荷载反馈,即采用多项式表示等效温度,根据等效温度的各阶矩与分布式光纤顺河向实测温度相应的各阶矩相等,确定多项式的系数,进而得到等效温度的分布。分析表明,现有规范采用的全截面线性化等效温度仅是非线性等效温度在一次矩等效时的特例,通过计算2阶和3阶矩等效温度,获得坝段截面非线性温度分布,更加全面反映高拱坝从封拱灌浆到水库正常运行期间坝体温度的调整过程,可为拱坝设计提供有益的技术补充。
[Abstract]:Temperature load is one of the main design loads of arch dam, which is closely related to arch sealing temperature, environmental temperature, reservoir water temperature and so on. The actual temperature load is inevitably different from the design temperature load, and the traditional point thermometer has little information on monitoring data. It is difficult to carry out reasonable and effective feedback of temperature load on arch dam. Combined with the distributed optical fiber measured temperature along the river direction of the typical dam segment of Xiluodu High Arch Dam, the actual temperature load feedback of the high arch dam is carried out based on the moment method, that is to say, the equivalent temperature is expressed by polynomial. According to the corresponding moments of the equivalent temperature and the measured temperature along the river direction of the distributed fiber, the coefficient of the polynomial is determined and the distribution of the equivalent temperature is obtained. The analysis shows that the linearized equivalent temperature of the whole section adopted in the existing code is only a special case of the nonlinear equivalent temperature when the first moment is equivalent. The nonlinear temperature distribution of the dam section is obtained by calculating the equivalent temperature of the second and third order moments. A more comprehensive reflection of the dam temperature adjustment process from arch sealing grouting to the normal operation of the reservoir can provide a useful technical supplement for the design of arch dam.
【作者单位】：兰州交通大学博文学院;三峡大学水利与环境学院;甘肃省水利厅;
【基金】：国家自然科学基金资助项目(51209124)
【分类号】：TV642.4

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