摘要
滑坡地质灾害在我国西北、西南广泛分布,传统的滑坡调查是采用地面调查结合钻探、槽探、坑探等方法进行.采用高性价比的地球物理手段进行滑坡勘查,对查清滑坡结构、探索其成灾机理和地质灾害评估及预警有重要意义.本文研究目的旨在探索研究低频地质雷达方法在滑坡勘查中的应用效果,为地质灾害调查提供实用技术手段.通过理论分析和野外试验,建立了滑坡正演模型,得出了滑坡典型电磁波传播特征,并在西北和西南几处滑坡上开展了野外试验,分析了黄土滑坡和基岩滑坡的雷达剖面特征,给出了地球物理解释.试验结果表明:低频地质雷达技术能够划分滑坡地层结构,对滑面深度和滑床形态准确刻画,对落水洞位置准确定位,这充分证实地质雷达是一种实用有效的地质灾害调查与评价技术手段.
Landslide is widely distributed in northwest and northeast China. Conventional landslide investigating method is ground survey combined with drilling, trenching, and probing. Adopting highly cost-effective geophysical method to explore landslide has great significance for finding out the landslide structure, exploring the mechanism of the disaster, evaluating the geological disasters and early-warning. The paper aims at exploring and studying the application effects of low frequency GPR in landslide exploration and supplying practical techniques for geological disaster investigation. In this paper, we carried out GPR detecting test research, constructed the landslide forward model, given the typical EM wave characteristic, and did field tests in several typical landslides in northwest and southwest China. We analysed the profile feature of loess landslide and bedrock landslide and made the geophysical interpretation. The resu It showed that high resolution GRP result could divide landslide layers, accurately detect the sliding surface and loess; ponor, which is a practical and effective new method in geology disaster investigation and evaluation.
出处
《地球物理学进展》
CSCD
北大核心
2013年第2期1057-1063,共7页
Progress in Geophysics
基金
地质调查项目:陇东地区地质灾害详细调查(1212010814012)
地质灾害群测群防监测技术研发与示范(1212010740911)资助
关键词
低频地质雷达
黄土滑坡
滑面
落水洞
low-frequency GPR, loess landslide, sliding band, loess ponor
