摘要
高密度电阻率法因具有快速、信息量丰富、适用性广等特点,在工程勘查领域中被广泛应用。实例表明,高密度电阻率法具有体积效应,在对地下空洞进行探测时的低阻屏蔽作用非常明显;只有少数空气充填型地下空洞在理想状态下相对周围介质显示高阻或相对高阻,部分地下水充填型显示低阻或相对低阻,大多情况下地下空洞相对周围介质均表现为无异常或显示不明显,且有效探测深度只有洞径的五倍以内。指出不宜一概采用单一的高密度电阻率法探测地下空洞。为提高勘查精度,应重视地质调查和现场资料收集,遵循由已知到未知的原则,强调多种物探方法的合理运用和资料的综合分析。
High-density resistivity method has fast speed,rich information and wide applicability,etc.,that be widely used in the field of engineering exploration.Examples show that it has volume effect,and has low resistance shielding effect very clear in survey to underground caves.In most instances underground caves display no abnormality or weak showing,only in the ideal conditions show high resistance or relatively high resistance few underground caves type of air filling against with around media,and only in the ideal conditions show low resistance or relatively low resistance part underground caves type of water filling,but effective depth of high-density resistivity method to survey underground caves is within five times of hole diameter.Pointing out that should not all use the single high-density resistivity method of surveying to underground caves.In order to improve exploration accuracy,that should attention to the geological survey and field data collection,follow the principles from known to unknown,from easy to difficult,from point to plane,emphasizing rational useing of geophysical methods and comprehensive analysis of data.
出处
《工程地球物理学报》
2010年第6期674-678,共5页
Chinese Journal of Engineering Geophysics
关键词
地球物理勘查
高密度电阻率法
地下空洞
geophysical prospection
high-density resistivity method
underground caves
