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扬压力观测是混凝土坝重要监测项目之一,也是规定的必测项目.在1980年工程整体竣工验收时认为,主坝的扬压力观测,只设有一个横向断面,偏少.同时在纵向也未设有观测孔.为了进一步掌握主坝Ⅴ～Ⅵ坝段的扬压力情况,从1980年开始,相继增设了纵向扬压孔6个及Ⅵ坝段横向断面的测压孔.在运行过程中发现,除Z_(6-4)、Z_(7-5)两个纵向孔的测值偏大以外,其他均属于正常.为了确保大坝的安全运行,搞清坝基扬压的分布状态,以及两个纵向孔测值偏高的原因,对观测资料进行初步分析.
Yang pressure observation is one of the important dam monitoring projects, but also the required test items in the overall acceptance of the project in 1980, that the main dam Yang pressure observation, only with a horizontal cross section, less than normal at the same time in the vertical There is no observation hole.In order to further grasp the main dam Ⅴ ~ Ⅵ section of the pressure of the situation, since 1980, have added a vertical pressure hole 6 and VI cross-section of the transverse section of the piezometric pressure hole in operation It is found that except for the measured values of Z_ (6-4) and Z_ (7-5) two longitudinal holes are larger than normal, all of them are normal. In order to ensure the safe operation of dams, The reason why the two longitudinal holes measure high is the primary analysis of the observed data.