改进型瞬变电磁装置在隧道超前地质预报探水中的对比

Comparison of Improved Transient Electromagnetic Devices in Water Exploration of Tunnel Advance Geological Forecast

隧道掌子面前方地下水发育情况的探测工作一直是隧道超前地质预报工作中的重点。瞬变电磁法凭借对地下水敏感的特性,已被使用于隧道超前预报探水工作中。但隧道近似于一个全空间环境,而常规的瞬变电磁理论均是建立在半空间环境基础上。为适应隧道等全空间环境的探测工作,许多厂商对传统的瞬变电磁装置进行了不同改进,而这些改进装置的应用效果还有待实际工程项目的检验。因此采用3种不同改进的瞬变电磁装置置于某在建隧道的同一掌子面处进行探水工作,且将隧道的开挖实际情况与探测成果进行对比分析,评判了3种装置的应用效果,为隧道超前地质预报探水工作提供参考。

The exploration of groundwater development in front of the tunnel working face has always been the focus of tunnel advance geological forecast.Transient electromagnetic method has been used in water exploration of tunnel advance forecast by virtue of its sensitivity to groundwater.However,the tunnel is similar to a full-space environment,while the conventional transient electromagnetic theory is based on a semi-space environment.In order to adapt to the exploration work of full-space environment such as tunnels,many manufacturers have made different improvements to the traditional transient electromagnetic devices whose application effect needs to be tested in practical engineering projects.Therefore,three different improved transient electromagnetic devices are placed at the same working face of a tunnel under construction for water exploration,and the actual excavation situation of the tunnel is compared with the exploration results to evaluate the application effect of the three devices,providing references for the water exploration of tunnel advance geological forecast.