特高拱坝施工及初次蓄水期变形回归模型研究

针对特高拱坝施工及初次蓄水期间的变形特点,在传统模型基础上,增加了初次蓄水坝高因子、初蓄温度因子和初蓄渗流因子,建立了施工及初次蓄水作用下的大坝变形回归模型。通过对某高拱坝初次蓄水期间大坝回归分析可知,新模型拟合精度高,各测点相关系数均在0.99以上。水压分量、温度分量、坝高分量、初蓄及时效分量变化趋势以及在整个径向位移中所占比例符合实际规律,考虑了施工及初次蓄水期间坝体上升、外界温度影响、坝体自身温度变化、初次蓄水及渗流作用、时效等影响,反映了初蓄期间坝体的变形特性。总之,新的大坝变形回归模型能够较好地反映施工及初次蓄水期的各种影响因素,便于分析施工及初次蓄水期坝体的工作性态。

Research on deformation regression model for super-high arch dam during its construction and initial impoundment

Aiming at the deformation characteristics of super-high arch dam during its construction and initial impoundment，a deformation regression model for the dam under the effects of the construction and its initial impoundment is established herein on the basis of the conventional model，in which the factors of dam height，temperature and seepage during the initial impoundment are added. It is known through the dam regression analysis made during the initial impoundment of a high arch dam that this new model has a high fitting accuracy with the correlation coefficients of all the measuring points being above 0.99. Under the consideration of the construction and the effects of the rise of dam body，the surrounding temperature and the self-temperature change of dam body as well as the effects of the initial impoundment，seepage，time effect，etc.，the changing trends of the components of water pressure，temperature，dam height，initial impoundment and time effect and their proportions in the entire radial displacement accord with the actual law，which reflect the deformation characteristics of the dam body during the initial impoundment. Generally，this new dam deformation regression model can satisfactorily reflect all the impacting factors during the construction and the initial impoundment，and then is convenient to analyze the operation behavior of the dam during the construction and initial impoundment.