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富春江大坝河床14号坝段基础每年夏季出现周期性下沉,分析认为,该现象与富春江大坝特殊的地基条件及电站运行方式有关。通过有限元计算及统计模型定量分析,证实下游水位升高确会导致地基下沉。由于静力水准观测精度较高,发现了人工观测条件下不易发现的问题,为反演坝基力学参数提供了一种更好的途径。同时,由于地质勘探的局限性,对于勘探期间无法到达的区域,原位观测成果可作为对地质调查成果的有效补充。
The foundation of Fuchunjiang Dam No.14 dam section periodically sinks every summer. It is considered that this phenomenon is related to the special foundation conditions and operation mode of Fuchunjiang Dam. Through finite element analysis and statistical model quantitative analysis confirmed that the downstream water level rise will indeed lead to the foundation subsidence. Because of the high accuracy of static leveling observation, the problems that are not easy to be found under the artificial observation conditions are found, which provides a better way to back up the mechanical parameters of the dam foundation. In the meantime, due to the limitations of geological exploration, in situ observation results can be used as an effective supplement to the geological survey results in areas that can not be reached during exploration.