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1998年 ,长江发生特大洪水时 ,隔河岩水库水位超出正常蓄水位 3.94m ,分析本年度该枢纽各建筑物的变形是必要的。在对 1998年隔河岩电站进水口的变形监测资料分析中 ,选择物理推断法及图表法对变形量大的测点作了特征值分析。针对监测数据呈多峰曲线型 ,采用广义线性多项式逐步回归方法建立了变形模型 ,对进水口的工作性状作出了初步分析。结果表明 :1998年进水口处于向上游、向左岸位移状态 ,随水位、气温变化 ,其变形具有周期性。进水口受静水压力的影响 ,墩顶沉降面向河床方向呈非线性增大 ,靠上游侧沉降量大于下游侧沉降量。沉降与上游水位、气温呈负相关 ,夏季墩顶上抬 ;春、冬季墩顶下沉。说明 1998年隔河岩电站进水口在较长时间的高气温、高水位的考验下工作状态正常 ,其变形规律及影响因素与 1997年相一致。
In 1998, when an exceptionally big flood occurred in the Yangtze River, the Geheyan reservoir water level exceeded the normal water level of 3.94m. It is necessary to analyze the deformation of all the buildings in this year. In the analysis of deformation monitoring data at the inlet of Geheyan Hydropower Station in 1998, eigenvalue analysis was made on the measuring points with large deformation by selecting physical inference method and charting method. According to the multi-peak curve type of monitoring data, a generalized linear polynomial stepwise regression method was used to establish the deformation model, and a preliminary analysis was made of the working characteristics of the water inlet. The results show that in 1998, the water inlet is in the upstream and left bank displacements, and its deformation is cyclical with the change of water level and temperature. The water inlet is affected by the hydrostatic pressure. The settlement at the top of the pier shows a non-linear increase in the direction of the riverbed, and the settlement on the upstream side is larger than that on the downstream side. The settlement is negatively correlated with the water level and temperature of the upper reaches, and the pier top is lifted in summer; the pier top is sunk in spring and winter. This shows that the working status of the Geheyan Hydropower Station inlet at the relatively high temperature and high water level in a long time was normal in 1998. The deformation rules and the influencing factors are in line with those of 1997.