Instrument Selection and Coil Arrangement for Train-borne Transient Electromagnetic Method Detecting Water-bearing Anomalies in Short Distance
(1. School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031; 2. School of Transportation and Civil Engineering,Nantong University, Nantong 226019)
Abstract：
The percentage of groundwater-related defects in operating high-speed railway tunnels has been increas? ing with an urgent need for fast and accurate defect detection technologies. The use of train-borne transient electromagnetic method (TEM) to detect water-bearing anomalies within 5 to 10 meters behind the lining of operating tunnels is a new technical practice. In view of the uniqueness of water-bearing anomalies in tunnels, this paper first adopts the numerical simulation method to study the electromagnetic features of different types of water-bearing anomalies, then carries out numerical simulations for the distribution of water-bearing anomalies, and finally conducts physical model tests for the electromagnetic response of coils missing from the numerical simulations. In the tests, the feasibility of existing instruments for detecting water-bearing anomalies in short distance is verified by comparing different TEM instruments, as well as the effectiveness of the close-distance train-borne TEM detection system when the anomalous position changes.
LI Zongyang1 Qi Taiyue1 QIN Shaojie1 QIAN Wangping2
.Instrument Selection and Coil Arrangement for Train-borne Transient Electromagnetic Method Detecting Water-bearing Anomalies in Short Distance[J] MODERN TUNNELLING TECHNOLOGY, 2022,V59(1): 241-248
2022, Vol. 59 