摘要
古河道沉积物成分复杂、均匀性差,强度、变形等特性差异明显,易引发各种岩土工程问题。在工程建设前,有必要进行相应的前期调查,以规避古河道带来的工程风险。本文在前人研究的基础上,根据武清地区古河道发育、岩(土)物性特征,利用综合物探方法对浅埋古河道进行探测试验。结果表明,利用微重力剖面测量中的高重力异常和梯度变化带,可对浅埋古河道的富集砂体进行有效识别;利用高密度电阻率法反映的高阻电性异常可对浅埋古河道进行识别和划分,而视电阻率剖面电性特征不明显,规律性较差。
Due to the complex composition,poor uniformity,and obvious differences in strength and deformation of ancient channel sediments,it is easy to trigger various geotechnical engineering problems.Therefore,it is necessary to carry out the corresponding preliminary investigation before the construction of the project to avoid the engineering risk caused by ancient channels.Based on the previous studies,this paper uses integrated geophysical methods to conduct exploration tests on shallow buried ancient channels based on the development of ancient rivers and the characteristics of rock(soil)properties in Wuqing area.The results show that the high gravity anomaly and gradient change zone in the microgravity profile measurement can effectively identify the rich sand bodies of shallow buried ancient channels;the high resistivity anomaly reflected by high density resistivity method can be used to identify and divide shallow buried ancient channels,but the electrical characteristics of apparent resistivity profile are not obvious and the regularity is poor.
作者
张艳国
周永贵
Zhang Yanguo;Zhou Yonggui(Tianjin North China Engineering Inverstigation & Design Co., Ltd,Tianjin 300181,China)
出处
《工程地球物理学报》
2021年第3期386-390,共5页
Chinese Journal of Engineering Geophysics
关键词
古河道
综合物探
重力异常
高密度电阻率法
视电阻率剖面法
ancient channel
integrated geophysical method
gravity anomaly
high density resistivity method
apparent resistivity profiling
