隧道瞬变电磁超前探测装置型式对比与试验研究

发布时间：2018-03-21 19:39

本文选题：隧道工程　切入点：隧道含水构造　出处：《岩石力学与工程学报》2017年S1期 　论文类型：期刊论文

【摘要】：为了研究隧道瞬变电磁超前探测中不同装置型式对采集数据和成像结果的影响,通过数值试验和现场试验对比了4种掌子面收发装置布设方式:即中心回线装置和3种偶极装置(分别为固源直线接收偶极装置、固源拱形接收偶极装置、固源等距接收偶极装置)。采用时域有限差分方法对掌子面前方包含直立含水断层和倾斜充水断层进行正演计算,对模拟曲线进行了对比和分析;并利用某水电站现场的已知试验条件进行试验数据采集;数值和现场试验的数据均采用全域视电阻率计算方法进行视电阻率成像。通过数值试验和现场试验对比,发现4种装置型式均可以成像确定含水体位置,但不同装置型式的探测结果有所差异:(1)固源直线接收偶极装置对于识别含水体的位置和形态最为有效;(2)中心回线装置能够有效识别含水体的位置,但是识别含水体形态效果不好;(3)固源等距接收偶极装置对于含水体形态识别能力较好,但是识别含水体位置能力不强;(4)固源拱形接收偶极装置识别含水体的位置和形态都不理想。综上所述,固源直线接收偶极装置对于识别含水体的位置和形态在4种装置型式中最为有效,而且发射源固定于掌子面,只需移动数据接收机,易于提高工作效率。
[Abstract]:In order to study the influence of different device types on data acquisition and imaging results in tunnel transient electromagnetic advance detection, Through numerical test and field test, four configuration modes of palmtop transceiver are compared: central loop device and three kinds of dipole device (fixed source straight line receiving dipole device, fixed source arch receiving dipole device, fixed source arch receiving dipole device). Using the finite difference time domain (FDTD) method, the forward calculation of vertical and inclined water-filled faults in front of the palms is carried out, and the simulation curves are compared and analyzed. The experimental data are collected by using the known test conditions of a hydropower station, and the data of both numerical and field tests are imaged by the method of global apparent resistivity calculation. It is found that the four types of devices can be used to determine the position of the water body by imaging. But the detection results of different types of devices are different. (1) the fixed source straight line receiving dipole device is the most effective device for identifying the position and shape of the water body. The central loop device can effectively identify the position of the water body. But the effect of identifying the shape of the water body is not good. (3) the device of solid source isometric receiving dipole is better for the recognition of the shape of the water body. But the ability to identify the position of the water body is not strong. (4) the fixed source arch receiver dipole device to identify the position and shape of the water body is not ideal. The fixed source straight line receiver dipole device is the most effective in identifying the position and shape of the water body, and the emitter is fixed on the palm surface, which only needs to move the data receiver, and it is easy to improve the working efficiency.
【作者单位】：山东大学岩土与结构工程研究中心;长安大学地质工程与测绘学院;
【基金】：国家自然科学基金资助项目(41404104) 山东省博士基金资助项目(BS2014HZ006) 山东大学自主创新基金资助项目(2014GN029)~~
【分类号】：P631.325;U452.11

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