瞬变电磁探水雷达研究

Research on Transient Electromagnetic Exploring Water Radar

隧道掌子面探水问题,是交通隧道、采矿业、地下空间开发行业一直未解决的难题。由于不同地质环境各种蓄水构造的复杂性,使得以地球物理方法为主的地质预报技术面临着挑战。地震反射法对构造敏感,电法对水敏感,但常规电法由于装置问题很难在隧道掌子面施展。地质雷达由于高频微波段穿透能力的局限性,使得在隧道掌子面探测深度有限。瞬变电磁法利用不接地回线,以其自身的方法优势已广泛应用于隧道掌子面的地质预报中。首次利用浅层瞬变电磁法原理、定源回线装置、全期视电阻率计算、雷达波谱图像处理等技术,研制了相应瞬变电磁探水雷达,并在隧道掌子面、地面岩溶探查方面进行工程应用,验证了浅层瞬变电磁法在地下水探查中的应用效果。

Water exploration in tunnel face is a problem that has not been solved in tunnel construction,mining industry and underground space development industry.Due to the complexity of various water storage structures in different geological environments,geological prediction technology based on geophysical methods is facing challenges.Seismic reflection method is sensitive to structure,and electrical method is sensitive to water.Due to the limitation of penetrating capability of high frequency microwave segment,the depth of GPR in the palm surface of tunnel is limited.TEM has been widely used in geological prediction of tunnel face by using ungrounded loop.This paper adopts shallow transient electromagnetic method,fixed source loop device,the whole period of apparent resistivity calculation and radar wave spectrum image processing technology,develops a corresponding transient electromagnetic exploring water radar.It is applied in the tunnel engineering and ground karst exploration and verified in the shallow groundwater.