Application of Microgravity Detection in Shallow Goaf below 200 Meters——Taking Huangzhuang Coal Mine as an Example
Gangcheng district of Ji'nan city is planning to build a citizen cultural and sport comprehensive center.The construction site is located in the former Huangzhuang coal deposit,which has a long history of coal mining.The mining data record is not detailed,so it is necessary to detect the mined-out area.The construction site is located in the urban area,which suffers serious human electromagnetic interference.Based on the principle of density property difference,microgravity detection technology has been proposed.In this paper,the mined-out model of the study area has been established and the associated ground grav-ity anomaly response has been calculated.The measured data has been processed by vertical first derivative and trend surface analysis.Compared with the transient electromagnetic results,the mined-out area range can be comprehensively detected.It is proved by drilling that there are holes in the mined-out area that the micro-gravity method is feasible at the depth of 200m.
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