Mine water inflow prediction and effect evaluation based on fused drilling-geophysical data

Abstract

This paper takes Dahaize Coal Mine as the typical research object, based on data from 238 geological and hydrogeological boreholes and 50 geophysical cross sections, we analyzed the main factors affecting mine water inflow, recognized and determined the factors of water filling in the mining strata, constructed a three-dimensional geological entity model of mine field, used numerical simulation method, large well method and water collecting corridor method to predict and calculate mine water inflow, and comprehensively compared a variety of methods and results.The results show that the geophysical prospecting data can make up for the inadequacy of geological drilling for regional control, use the drilling, geophysical prospecting data to describe the mining geological stratum structure, construct 3D geological solid model of mine field, which includes Quaternary aquifer, Quaternary- Cretaceous aquifer, Cretaceous aquifer, Cretaceous-Anding formation aquifer, Anding formation-Zhiluo formation aquifer, Zhiluo formation aquifer, No.2 coal seam aquifer and 2-3 coal aquifer; through the comparison of the results of groundwater numericalsimulation, large well method and catchment corridor method, the mutual verification of different calculation methods is realized; big well method and the calculation method of water inflow can only make a static water prediction, the numerical simulation method can be used to subdivide the aquifer system structure based on drilling and geophysical data, accurately describe the motion law of the mining area of groundwater in the process of mining, and consider the work progress of coal mining, to implement the dynamic prediction of water inflow, improve the calculation precision of coal mine water inflow.

Keywords

• mine inflow
• geophysical survey
• data fusion
• prediction
• effect evaluation