水管倾斜仪观测受水库荷载影响实例分析

Analysis of water tube tiltmeter observation affected by reservoir load

河北省易县地震台DSQ型水管倾斜仪NE向2022年2月14日以来观测数据曲线出现趋势下降E倾变化,年变观测数据曲线不同于往年。对该异常进行了分析,并结合三维集中荷载模型模拟计算结果表明:2022年2月14日-4月6日旺隆水库共泄流总库容量达到279.5万m^(3),造成倾斜变化理论值为1.27×10^(−7),高于倾斜干扰的限定指标1.455×10^(−8)一个量级,推测旺隆水库泄流荷载是造成易县台水管仪NE分量加速异常变化的主要因素。

The NE component curve of DSQ water tube tiltmeter at Yixian seismic station in Hebei Province had a downward trend since February 14,2022.The annual change curve was different from that of previous years.Combined with the simulation results of three-dimensional concentrated load model,it is shown that the total reservoir capacity of Wanglong reservoir reached 279.50×10^(4)m^(3)from February 14 to April 6,2022.The theoretical value of tilt change was 1.27×10^(−7),which is higher than the limit index of tilt interference of 1.455×10^(−8).It was inferred as the main factor causing the abnormal change of NE component acceleration of water tube instrument at Yixian station.