地球物理方法在某水库坝体隐患探测中的应用研究

水库坝体隐患有可能演变为险情,危及下游居民生命财产安全,开展水库坝体隐患调查工作具有重要意义。分析某水库坝体正常土体与隐患之间的波速、电阻率、介电常数差异,针对性地采用瑞雷波法、高密度电阻率法、地质雷达法等综合物探技术探测某水库坝体隐患,最终查明约8.5 m以下地层为坝基土;坝身土体具有上密下疏的结构特征,圈出三处异常部位,与已知裂缝位置吻合。文中提出高密度电阻率法适合坝体隐患普查及安全预报工作、瑞雷波法适应于坝体软弱层或疏松土体探测、地质雷达法适合坝体浅部隐患详查的使用建议,总结水库隐患异常模式,对今后类似病害水库坝体开展隐患探测工作具有借鉴意义。

Research on Aplication of Geophysical Methodsto Survey Reservoir Dam' s Hidden Danger

The hidden danger of reservoir dams may develop into peril,which endanger life and property of people living downstream.So it has great significance to survey hidden danger of reservoir dam.According to difference of wave velocity,resistivity,dielectric constant between normal and hidden danger of reservoir dam,we use Rayleigh wave,high-densityresistivitymethod,geological radar to survey the latter.Finally we find that foundation is below 8.5m and that upper dam is dense and the lower is porous.We find out three abnormal positions which tally with the known crack.We throw out a suggestion that High-densityresistivitymethod is suitable for the widly investigation of hidden danger and safety prediction of dam bady,rayleigh wave is suitable for the detection of weak layer or loose soil,and geological radar is suitable for the investigation of shallow hidden danger.We sum up anomaly pattern of hidden danger.The work we have done can be used as a reference for future exploration of hidden danger in similar reservoirs.