涔天河面板堆石坝施工期变形监测资料及参数反演分析

对涔天河面板堆石坝施工期变形监测资料进行了较全面分析,然后建立了堆石坝施工期有限元模型。基于实测相对沉降,采用正交设计、神经网络、遗传算法相结合的方法,反演了堆石坝的非线性材料参数。分析表明:(1)涔天河面板堆石坝坝体沉降随着大坝填筑的逐步升高而增大,当填筑到320.3 m高程后,坝体沉降变形渐趋稳定。在施工期间,该大坝经历了"5.20"洪水、"11.11"罕见冬汛等事件,但对堆石坝的变形影响小。(2)基于实测相对沉降进行的堆石坝材料参数反演结果表明,主堆石区的K和Kb较室内剪切试验参数偏小,而其他反演参数结果和室内剪切试验值较为接近,沉降值计算值与实测值的时程曲线趋势符合较好。(3)由于观测房修建滞后,沉降仪从安装埋设到首次观测期间的沉降位移缺乏过程值,建议及时修建观测房,尽早获得沉降过程值。

Inversion analysis on deformation monitoring data and parameters in construction period of Centianhe River Concrete Face Rockfill Dam

A comprehensive analysis is made on the deformation monitoring data during the construction of Centianhe River Concrete Face Rockfill Dam herein， and then a finite element model for the construction period of the dam is established. Based on the measured relative settlement， the nonlinear material parameters of the rock fill dam are inversely analyzed with the method integrated with orthogonal design neural network genetic algorithm. The analysis shows that: （1） The settlement of the body of Centianhe River Concrete Rockfill Dam increases along with the gradual increase of the filling height. When the filling height reaches the elevation of 320.3 m， the settlement of the dam body is gradually tended to stabilize. During the construction period， the dam experiences the event of “5.20” Flood and the rare “11.11” Winter Flood， however， only small impact is there on the deformation of the dam. （2） It is indicated from the result of the inversion analysis made on the materials for the construction of the dam on the basis of the measured relative settlement that compared with the parameters obtained from the indoor shear test， the inversion values of K and Kb in the main filling zone are little bit smaller， while the other inversion values are more close to those of the indoor shear test and the calculated settlement value is better coincided with the trend of the time history curve of the measured value. （3）Due to the lagging of the construction of the observation house， there are lack of the process values of the settlement in the period from the embedding to the initial observation， thus the observation house is suggested to be timely built for obtaining the settlement process values as earlier as possible.