浅埋深线圈瞬变电磁场超前探测响应及应用

doi:10.16265/j.cnki.issn1003-3033.2024.05.1294

摘要/Abstract

摘要：

为有效识别隧道工作面前方采空区、岩溶、导水裂隙带等不良地质情况,预防隧道开挖透水事故,开展浅埋深线圈瞬变电磁理论在隧道超前探测中应用的研究。首先,利用COMSOL软件建立浅埋深线圈超前探测模型,研究工作面前方不同方位电磁场的传播特性和异常响应特征;然后,以青岛地铁13号线嘉陵江路站-香江路站区间隧道工程为例,验证浅埋深线圈瞬变电磁法识别异常体的可行性。结果表明:浅埋深瞬变电磁法可有效识别工作面前方不同位置的低阻异常体;不同方位异常体对于电场响应的影响主要体现在响应强度上;瞬变电磁场可有效区别出空气域和岩体域,但受空气域的影响,电磁场在近地表的高阻围岩中衰减速度加快,导致在反演分析中实际探测工作存在高阻异常。

关键词: 浅埋深线圈, 瞬变电磁场, 超前探测, 工作面, 低阻异常体, 隧道施工

Abstract:

To effectively identify adverse geological conditions such as goaf, karst, and water-conducting fracture zones ahead of the tunnel face and prevent water inflow accidents during tunnel excavation, the application of shallow buried deep coil transient electromagnetic theory in tunnel advanced detection was investigated. A shallow buried deep coil advanced detection model was proposed by COMSOL software to investigate the propagation characteristics and abnormal response features of electromagnetic fields in different directions ahead of the tunnel face. The tunnel project between Jialingjiang Road Station and Xiangjiang Road Station Qingdao Metro Line 13 was used to validate the proposed model's performance in identifying abnormal responses. The results showed that the proposed model can effectively identify low-resistivity anomalies at different positions ahead of the tunnel surface. Moreover, the effect of anomalies in different azimuths on the electric field response was mainly presented in the response intensity. Transient electromagnetic field can effectively distinguish the air zone and rock zone, and the electromagnetic field attenuated faster in the high-resistance surrounding rock near the surface due to the influence of the air zone, resulting in high-resistance anomalies of the practical detection during inversion analysis.

Key words: shallow buried deep coil, transient electromagnetic, advanced detection, working face, low resistance anomalous body, tunnel construction

中图分类号:

X935

王春源, 张桓, 马洪亮, 梁庆华. 浅埋深线圈瞬变电磁场超前探测响应及应用[J]. 中国安全科学学报, 2024, 34(5): 75-81.

WANG Chunyuan, ZHANG Huan, MA Hongliang, LIANG Qinghua. Advanced detection response and application of transient electromagnetic field of shallow buried deep coil[J]. China Safety Science Journal, 2024, 34(5): 75-81.

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对象	电导率/ (S·m^-1)	相对磁导率	相对介电常数
岩体	0.01	1.00	10
隧道(已挖)	1.00×10^-6	1.00	1.00
低阻异常体	1.00	1.00	60.00
空气	1.00×10^-6	1.00	1.00
发射线圈(Tx)	6.00×10⁷	1.00	1.00
接收线圈(Rx)	6×10⁷	1.00	1.00

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