| 传统瞬变电磁法的改进及其在隧道超前地质预报中的应用 |
| |
| 引用本文： | 伍小刚,李天斌,张中,薛德敏.传统瞬变电磁法的改进及其在隧道超前地质预报中的应用[J].水文地质工程地质,2021,48(1):163-170. |
| |
| 作者姓名： | 伍小刚 李天斌 张中 薛德敏 |
| |
| 作者单位： | 成都理工大学地质灾害防治与地质环境保护国家重点实验室，四川 成都 610059 |
| |
| 摘 要： | 为保证施工人员和设备的安全，在隧道开挖过程中需要掌握掌子面前方含水不良地质体的发育情况。较为常用的探测含水不良地质体的物探方法为传统瞬变电磁法。由于以往没有重视探测装置与地质体间的耦合关系，传统瞬变电磁法沿单一测线进行数据采集的方式只能从单一角度发射磁场从而获得单一角度的探测结果，因此一直存在预报不准、漏报等问题。为了克服上述问题，提高预报的准确性，文章对传统瞬变电磁法进行了改进。基于探测装置与地质体间的良-强耦合关系，提出了一种能从水平和竖直方向进行多角度探测的共轴偶极法，通过转动探测装置从多个角度发射磁场，使单一角度无法探测的地质体也能与磁场达到良-强耦合效果，从而降低预报不准、漏报的可能性。共轴偶极法具有多个角度的探测结果，多个结果相互印证，具有比传统方法更高的准确性。在九绵高速公路天池隧道里程为YK223+135—YK223+035段内进行传统方法和共轴偶极法预报，开挖验证表明共轴偶极法对含水节理裂隙和岩溶裂隙等含水不良地质体的预报准确性比传统方法高，可为类似隧道超前地质预报工作提供一定参考。
|
| 关 键 词： | 隧道 超前地质预报 瞬变电磁法 共轴偶极 含水不良地质体 |
| 收稿时间： | 2020-03-12 |
Improvement of the traditional transient electromagnetic method and its application to advanced geological forecast of tunnel |
| |
| WU Xiaogang,LI Tianbin,ZHANG Zhong,XUE Demin.Improvement of the traditional transient electromagnetic method and its application to advanced geological forecast of tunnel[J].Hydrogeology and Engineering Geology,2021,48(1):163-170. |
| |
| Authors: | WU Xiaogang LI Tianbin ZHANG Zhong XUE Demin |
| |
| Institution: | State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu, Sichuan 610059, China |
| |
| Abstract: | In order to ensure the safety of construction personnel and equipment during tunnel excavation,it is necessary to master the development of water-bearing poor geological bodies in front of the tunnel face.The most commonly used geophysical exploration method to detect water-bearing poor geological bodies is the traditional transient electromagnetic method.Since no attention has been paid to the coupling relationship between the detection devices and the geological bodies,the traditional transient electromagnetic method for data acquisition along a single survey line can only launch a magnetic field from a single angle to obtain the detection results from a single angle.Therefore,problems such as inaccurate forecast and missed forecast have always existed.In order to overcome the above problems,improve the accuracy of forecast,the traditional transient electromagnetic method is improved in this paper,based on the well-strong coupling relationship between the detection devices and the geological bodies,a coaxial dipole method with multi-angle detection from horizontal and vertical directions is proposed.By rotating the detection devices to emit magnetic field from multiple angles,the geological bodies that cannot be detected from a single angle can also achieve a well-strong coupling effect with the magnetic field,thus reducing the possibility of inaccurate forecast and missed forecast.The coaxial dipole method has more accuracy than the traditional method because of its multi-angle detection results. The traditionalmethod and the coaxial dipole method were used to forecast in Tianchi tunnel in Jiumian expressway fromYK223+135 to YK223+035. The excavation verification shows that the accuracy of the coaxial dipole method forwater-bearing poor geological bodies such as water-bearing joints and karst fractures is higher than that of thetraditional method. This method can provide some references for similar tunnel advanced geological forecast. |
| |
| Keywords: | tunnel advanced geological forecast transient electromagnetic method coaxial dipole method water-bearing poor geological bodies |
| 本文献已被 维普 等数据库收录！ |
| 点击此处可从《水文地质工程地质》浏览原始摘要信息 |
| 点击此处可从《水文地质工程地质》下载免费的PDF全文 |
