陣列源瞬變電磁法隧道高分辨超前探測研究
[Abstract]:A series of geological hazards, such as water inrush and mud inrush, often occur in the process of tunnel excavation, which seriously threaten the safety of construction personnel and equipment, delay the progress of tunnel construction, even break the original groundwater distribution and hydrological ecological environment in the tunnel area, and affect the normal life of local residents. However, due to the constraints of complex geological conditions and limited construction environment, there are still some problems in the fine detection and rapid interpretation of the reservoir in front of the face and the hydraulic connection between the diversion structure and the hydraulic connection. The fine detection of these geological hazards requires new methods, new technologies and new theories. TEM is a time domain electromagnetic detection method, which has been widely used in tunnel water and mud inrush prediction and underground engineering water hazard detection. Based on the idea of array radiation, the advanced prediction method of array source transient electromagnetic tunnel is proposed in order to fine detect the unfavorable geology in front of the face and provide scientific guidance for subsequent construction and disaster control. The method of "multi-source radiation, multi-point reception" has the following advantages: firstly, by shortening the supply pulse duration of the emitter, broadening the zero-crossing bandwidth of the emitter, enriching the high-frequency harmonic components in the radiation field, and then improving the fine resolution of the structure. Secondly, by enlarging the size of the array source and extending the length of the transmitting unit, the overall radiation energy of the emitter can be increased, and the signal-to-noise ratio of the response signal and the detection depth can be improved. In order to further shorten the forward computing time of the three-dimensional complex model, the heterogeneous parallel algorithm is carried out on the basis of previous work. Secondary optimization improves the computing speed of the program by about 5% on the basis of the original parallel acceleration. At the same time, the finite-difference time-domain (FDTD) loading method is modified for the array source radiation form, and the finite-difference time-domain (FDTD) forward calculation of large-scale array source transient electromagnetic method is realized. The three-dimensional forward modeling of the array source transient electromagnetic tunnel prediction method is carried out. The transient electromagnetic response of the conventional loop source and the array source is simulated and compared. It is verified that the array source has a stronger ability of anomaly recognition, especially the response component parallel to the face has a better resolution than the response component perpendicular to the face. By simulating and analyzing the three-component transient electromagnetic response of the secondary field excited by the array source with different parameters, it is verified that the radiation intensity can be significantly enhanced by enlarging the size of the array source and extending the length of the transmitting unit. It is found that the larger the scale of geological hazard body, the closer to the face, the lower the resistivity, the more obvious the transient electromagnetic response of array source. Analog array source detects thin faults in front of the face and analyzes the corresponding magnetic field distribution law. It is found that the array source has obvious abnormal response to thin faults and can clearly detect the existence of thin faults. The results of forward modeling can be used as guidance for the future production of array source instruments.
【學(xué)位授予單位】:長安大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:U452.11;P631.325
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