Research On The Formation Mechanism Of Water In Ore Deposit And The Tunnel Water Inflow Prediction

Deep analysis and research on the formation mechanism of water in ore deposit,and therefore accurate prediction of the tunnel water inflow are very important prerequisites for ensuring the mine safety production and construction.Meanwhile,they are also indispensable and important links throughout the ore deposit exploration,design and development.Jinlongshan gold deposit is located in Zhen'an County,Shaanxi Province.It is a large Carlin-type gold deposit.A large number of previous work shows that the prospecting prospect of this mining area is good.For a long time,the research on this area mainly focused on the genesis of the deposit,and the special research on its hydrogeological characteristic is still relatively little,and lack of the systematic hydrogeology research on this deposit.This dissertation takes Jinlongshan Gold Mine as the research object,and makes a systematic hydrogeological characteristic study on this deposit from several main aspects such as its hydrogeological condition,formation mechanism of water in the ore deposit and the prediction of the tunnel water inflow with some methods such as field survey and theoretical analysis.Through the deep research of this dissertation,the following results are obtained.(1)The inland strata in the mining area are mainly shale and siltstone,with relatively developed fractures and joints,good water permeability and poor water abundance.Groundwater is supplied by the atmospheric precipitation.Affected by strong tectonic action,there is no obvious and stable water-resisting layer in the mining area.The terrain in the area is strongly cut,the slope is large,the runoff is short,and the groundwater discharge conditions are good.(2)Fissure water and karst water in bedrock controlled by folds and faults is the main factor leading to direct water filling of the top and bottom plates of the deposit.However,the extension of these major water-controlled faults is limited.Due to the strong weathering of the surface,the near-surface fault zone has strong water permeability and conductivity.Therefore,the vertical infiltration and recharge of atmospheric precipitation along rock fissures and structural fissures is the main source of ore body water filling,followed by regional runoff recharge.(3)The complexity of hydrogeological exploration in this mining area is medium(type 2).(4)Three calculation methods,e.g.hydrogeological analogy method,large well method and numerical simulation method,are adopted to predict the tunnel water inflow,and the calculation results can provide the useful references for the future design and construction of this mine.In all,this study preliminarily finds out the main forming mechanism of water filling in the ore deposit in the study area,and preliminarily predicts the tunnel water inflow of this ore deposit.It makes up the shortage of the research on hydrogeology in Jinlongshan mine area and provides the important references for its future construction and mining.