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为了解小湾拱坝蓄水期坝踵应力应变的工作性态及变化趋势,采用变形法对小湾拱坝各处应变计组进行了应力计算,由此获得拱坝的工作性态正常,满足安全要求。采用多元回归方法对河床#22坝段监测资料建立预测分析模型,并对资料序列最后五天的应力值进行预测,从预测结果可知所建立的模型预测精度较高。当水库蓄水至1 240m时,预测的坝踵垂直向正应力在混凝土标号允许抗拉和抗压强度范围内,符合设计要求,从而表明大坝应力应变工作性态正常。
In order to understand the working behavior and the changing trend of the stress and strain of Xiaowan arch dam during the reservoir water level, the deformation method was used to calculate the stress of the strain gauge group at Xiaowan arch dam. The working state of the arch dam was normal, Meet safety requirements The multivariate regression method was used to establish the predictive analysis model for monitoring data of dam # 22 in riverbed. The stress values of the last five days of data series were predicted. From the prediction results, the accuracy of the model was high. When the reservoir water storage to 1240m, the predicted vertical heel dam normal stress in the concrete to allow tensile and compressive strength range, in line with design requirements, indicating that the dam stress strain normal working condition.