综合物探在某开挖核岛差异风化带调查中的应用

Comprehensive geophysical application in investigation of differential weathering zone of a nuclear power station

地球物理勘探具有设备轻便、成本低、效率高、工作空间广等优点,但存在多解性的问题,为了获取准确有效的解译成果,本文采用综合的物探方法,以地质雷达、地震面波法以及直达法波速测试等探测手段,对南方某滨海核电厂核岛开挖后反应堆厂房所揭露的差异风化带进行探测,并通过与核岛开挖地质编录及前期钻探成果进行对比,以查明差异风化带空间展布特征及物理力学特性。探测结果显示,综合物探法不仅能避免钻探方法对地基岩体完整性产生的影响,而且能在平面及纵向深度范围内探测差异风化带的空间展布特征,且探测效果显著,可为后续设计输入提供强有力的支持。

Geophysical exploration has the advantages such as light equipment,low cost,high efficiency and wide working space,but there is the problem of multiple solutions. For accurate interpretation results,the comprehensive geophysical method with geological radar,transient Rayleigh wave method and direct wave velocity test are adopted to probe the space distribution of the differential weathering zone in the reactor building of a nuclear power plant. Compared with the results of previous drilling and the geological logging,the spatial distribution characteristics and the geological properties of the differential weathering zone are found out. The detection results show that comprehensive geophysical exploration can avoid the influence of drilling method on the integrity of the rocky foundation,and can also detect the spatial distribution characteristics of the differential weathering zone in the plane and longitudinal depth range. The detection effect is remarkable and can provide strong support for follow-up design input.