| With the increase of mining depth,the coal face is increasingly threatened by mine water hazard in floor limestone,so it becomes particularly important to monitor and forecast the water-bearing abnormal area of floor limestone strata in the mining process.In order to improve the exploration precision of floor limestone water hazard,the dual-frequency IP monitoring technology of mine floor water hazard is proposed in this paper.By means of numerical simulation,physical experiment、field monitoring test and so on,the dual-frequency IP monitoring technology of floor water damage is studied.The specific contents are as follows:Firstly,this paper using numerical simulation software to build numerical model,select the F-type 1 and 12 double-frequently group since the research instrument model depending on the apparent amplitude frequency background searches,then add aquifer(low resistance strip)to build numerical model.Through the simulation,the amplitude frequency response characteristics of aquifer(low resistance strip)is response characteristics of low resistance and high amplitude frequency;Combining with the simulation results of multi-groups double frequently group,the intersection of WENNER three-electrode far-right data and WENNER three-electrode far-left data is transverse mid-point for aquifer(low resistance strip).Since the difference of collection modes,the extreme values of data are deviated to sides around anomaly,or the abnormal maximum gained the far-right sampling way of WENNER three-electrode goes along right deviation integrally.Through the simulation study of water-conduction rising,the closer the simulated water-conducting site is to the site of the surveying lines,the more the apparent amplitude frequency increases exponentially like exponential type。Secondly,in the physical experiment,the apparent amplitude frequency data was obtained through the system layout of high-density resistivity method and the profile and Bathymetry pole running method.By designed to contrast the metal electrode and non-polarized electrode,the analysis shows that the quality of the apparent amplitude frequency gained by the non-polarized electrode was relatively high,but the metal electrode still had a good effect.In engineering application,on the one hand,it is difficult to couple non-polarized electrode with base plate,on the other hand,the non-polarized electrode is too costly,so the metal electrode is still a feasible scheme.The flume experiment further proves that the self-developed instrument and high-density acquisition method can accomplish the task of dual-frequency IP detection of low resistance body.Finally,this paper further researched on the feasibility of dual-frequency IP method about floor water disasters monitoring technology,using the self-developed instruments to build reasonable online monitoring system.According to the discovery of apparent amplitude frequency and apparent resistivity data from the monitoring test processing analysis,for stratum-deciding,apparent amplitude frequency is more sensitive than apparent resistivity.It can supplement the processing and analysis of apparent resistivity parameters to further improve the accuracy of monitoring.The results of numerical simulation,flume experiment and actual monitoring test are anastomosed with each other which identifies that the dual-frequency IP method is feasible to monitor the floor water hazard,and the apparent amplitude frequency parameters are sensitive to the water-rich area of the floor limestone,which can be used as supplementary verification data for the apparent resistivity parameters obtained from test.Further study is needed on the accuracy of apparent amplitude frequency detection and delineation of aquifers.Figure [33] Table [2] Reference [90]... |
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