CSAMT野外工作方法的研究与应用

The Application and Research of CSAMT Field Work Methods

研究目的:当前,由于铁路的发展,线位深入到采空区的情况逐渐增多,给选线带来一定难度,一直以来,如何利用物探方法提高采空区勘察精度是一个难题。传统的物探方法工作效率低,勘探精度达不到要求,通过对本次工作的研究,目的是提高物探对铁路地质采空区勘察的探测精度及工作效率。研究结论:通过研究得出:(1)影响CSAMT数据质量因素除不可控的人文噪声外,还有可以控制的电极距的长度误差、电极距的水平方向偏差、磁探头水平方向偏差等非人文因素;(2)通过对上述非人文噪声的研究,可减少外业采集产生的视电阻率误差,获得可靠、准确的地电信息;(3)将本次研究应用在铁路地质采空区勘察中,结合采空区地质问题所具备的物性特征及大地电磁解释原则,可提高物探对采空区勘察的探测精度和分辨率,满足铁路地质采空区勘察的需求;(4)本研究成果可用于指导类似采空区项目的勘察工作。

Research purposes： Now, with the railway construction, railway lines more and more go deep into the mine area, difficulty growing railway line selection, how to improve the accuracy of gob survey geophysical of railway is an important issue. For gob survey survey, field work of this researching aims to improve the accuracy of the geophysical survey of gob survey. Research conclusions： （1）Controlled Source Audio Magneto Tellurics （CSAMT） data quality factors in addition to uncontrollable noise humanities, there is some non - human factors ： the length of the error can be controlled from the electrode, the electrode spacing of the horizontal deviation of the horizontal magnetic probe bias. （2） The research ＇of the non- humanistic noise can reduce the apparent resistivity error generated outside gathering, to obtain reliable and accurate geoelectric information. （3）The gob survey geological of railway in this researching, combined the geological problems for physical characteristics with the principles of magnetotelluric, improved the geophysical survey of the mined - out area of detection accuracy and resolution, satisfied the needs of the railway geological survey of mined - out area. （4）The research results can be used to guide the gob survey work on similar projects.