Origin Of The Enrichment Mineral Water In Danjiamiao And The Research On Mining Scheme

Based on the investigation and evaluation project of mineral water in Danjiamiao town,Huoshan courty,the paper makes the relatively independent hydrogeological units about 11.4 km2 around 2# and 3# wells area in the Da Longjing village as the research object.The genetic mechanism of large flow of mineral water wells in this area is analyzed and the mining scheme is researched.Based on the analysis of topography,landform,hydrology,meteorology,geology and hydrogeological conditions in the study area,the conceptual model of hydrogeology is established,and the relationship among supply,run-off and discharge of groundwater is cleared.The cause of regional mineral water enrichment is revealed.It is mainly due to the rupture structure in the north-south direction of the area and the surrounding reticular fissure zone.These structures are developed and produced with a large amount of rainwater infiltrating from the upper strata.The rainwater move to the downstream and the depth of the fault through the rapid water conduction channel.And it provides an important condition for the formation of natural mineral water.Referring to recent data in study area,the total amount of groundwater resources in the area and the allowable withdrawal under specific mining scheme are evaluated by water balance method.The results showed that the infiltration recharge of rainfall in average water year is 174.16×104 m3/a,the value in dry year is 145.62×104 m3/a,and the multi-year average value is 180.53×104 m3/a.The total emissions of groundwater were 168.06×104,186.30×104 and 177.56×104 m3/a respectively.The regulated storage of groundwater were 14.36×104,-33.52×104 and 11.97×104 m3/a respectively.The absolute equilibrium was-8.26×104,-7.16×104 and-9.0×104 m3/a.The relative equilibrium was 4.75%,4.92% and 4.99%.And the values of relative equilibrium were all less than 5%.The result of water balance was relatively accurate.Secondly,the numerical model of the study area is established,and the model is identified and validated by the test data.And this paper analyzes the existing pumping test data to calculate that the water burst of single well in the area is 701.87 m3/d.On this basis,ten different underground mining schemes are developed.The simulated impact drawdown of the wells under the different mining schemes by Visual Modflow is taken into the management model.And the model is solved by Matlab.Finally,the optimal mining scheme is obtained and the allowable withdrawal under the plan is 3760m3/d.