小湾拱坝蓄水期坝踵应力应变性态分析及预测

Stress Strain Behavior Analysis and Prediction of Xiaowan Dam Heel in Storage Period

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 obtain the stress and strain behavior and variation trend of Xiaowan dam heel,deformation method is used to calculate stress with strain meter set.So,the results shows that the working behavior of the arch dam is normal and it meets the safety requirements.And then multiple regression method is adopted to establish the prediction analysis model of dam section No.22.According to the model,the stress value of final five days of the data series is predicted.The results demonstrate that the model has high prediction precision.When the water level reaches 1 240 meter,the predicted stress is within the allowed concrete tensile and compressive strength and meets the design requirements.Thus,it shows that the stress and strain operating condition of the dam is normal.