Application of Transient Electromagnetic Method in saturation region detection in tailings dam
Since the 1950 s, Taolin ore has been exploited.Almost a hundred tons of tailing were backfilled between the hills for a long time, which formed Taolin dam during 50 years backfilling deposition.The stability of the huge dam is of great importance for the local peoples life and property protection.The transient electromagnetic method has been widely used in engineering survey, it provides kinds of configurations, can meet the demand of survey area with complex terrain.In this paper, TEM application is discussed in the detection field of dam saturation region.Firstly, this paper introduces the basic principle of transient electromagnetic method to detect saturation region.In the Multi-channel voltage profile in time domain and the apparent resistivity proposed cross-section diagram, there is obviously anomaly High voltage-low resistance in saturation region.Secondly, in order to highlight the vertical profile resistivity change, the vertical first derivative of the apparent resistivity cross-section is calculated.In the apparent resistivity vertical derivative anomaly map, the top of saturation region shows minimum negative gradient anomalies.The size of layers are clearly divided.The results shows that saturation region is almost below the horizontal plane, safe height,which provides reliable geological theory basis for Taolin tailings dam safety evaluation.Our results suggest that TEM has high detection accuracy.In the field of groundwater prospecting, transient electromagnetic method can be used as an important tool of prospecting.
transient electromagnetic method (tem) apparent resistivity vertical first derivative dams saturation line formatting
Yingsa Hu Zhaofa Zeng Xiong Chen Xueyu Zhao
College of Geo-exploration Science and Technology, Jilin University, Changchun 130026, China
国际会议
北京
英文
318-321
2016-06-27（万方平台首次上网日期，不代表论文的发表时间）