摘要
在工程地球物理的实践应用中,人文环境因素对勘探的影响常常是无法避免的。主要探讨天然电场选频法(frequency selectionmethod,FSM)在高压输电线附近开展地下水勘探的应用效果。首先,简单介绍静态效应的起因,并通过对天然电磁法二维有限元正演模拟,在以往研究成果的基础上进一步说明当近地表存在相对低阻异常体时,地表沿测线方向的水平电场分量会出现明显的静态效应;其次,将FSM应用于2处地下水勘探,验证FSM在高压输电线干扰下的应用效果,并利用实测结果说明FSM的异常成因主要是静态效应所致。根据理论模拟和实践可知,FSM实测的剖面曲线及拟断面图会出现明显的静态效应现象,且与理论模拟结果类似。同时,在高压线干扰环境下,只要测线方向与输电线方向平行,同样可取得成功的应用效果。这为今后类似环境下的应用提供了一种可供选择的物探方法。
The influence of human environmental factors on exploration is often unavoidable in the practical application of engineer⁃ing geophysics.Herein,the application effects of the frequency selection method(FSM)of telluric current in groundwater explora⁃tion near high-voltage transmission lines were discussed.Firstly,a brief introduction was given to the causes of static effects,and 2D finite element forward simulation of natural electromagnetic methods was carried out.Simulation results show that significant static shift characteristics of the horizontal electric field components along the measurement line will be observed when there is a rela⁃tively low resistance anomalous body near the surface.Secondly,FSM was applied to groundwater exploration in two locations to verify its effectiveness under interference from high-voltage transmission lines.The measured results of which were used to demon⁃strate that the main cause of FSM anomalies was the static shift.According to theoretical simulation and practical applications,it is known that the measured profile curves and pseudo-sections of FSM will have obvious static shift,which are similar to the theoreti⁃cal simulation results.At the same time,successful application results can also be achieved as long as the direction of the measure⁃ment line is parallel to that of the transmission line in high voltage interference environments,which provides an optional geophysical method for future applications in similar environments.
作者
杨天春
朱德兵
付国红
杨追
黄睿
YANG Tianchun;ZHU Debing;FU Guohong;YANG Zhui;HUANG Rui(National Engineering Research Center of High-Speed Railway Construction Technology,Changsha 410075,China;School of Earth Sciences and Spatial Information Engineering,Hunan University of Science and Technology,Xiangtan,Hunan 411201,China;Hunan Puqi Geological Exploration Equipment Research Institute,Changsha 410000,China)
出处
《中国科技论文》
CAS
2024年第10期1065-1072,共8页
China Sciencepaper
基金
国家自然科学基金资助项目(42074219)
中国中铁股份有限公司科技研究开发计划项目(2022-专项-09)
湖南省地质院科技计划项目(HNGSTP202417)。
关键词
地下水
静态效应
天然电场选频法
电磁干扰
天然电磁法
有限单元法
groundwater
static shift
frequency selection method(FSM)
electromagnetic interference
natural electromagnetic method
finite element method
