| The Zijin Mountain Copper Mine in the North of Shanghang County.According to the overall plan of comprehensive utilization of copper resources in Zijin Copper Mine,the lowest elevation is 148 meters.It will use the underground mining method;and pit plane range is from line 0 to line 13,the depth is 100 meters below the zero to the 100 meters above.The designing mining scale is 5000 tons per day.The deep copper mine is the ore body which is directly filled with the bedrock fissure water.Under the natural conditions,the groundwater in this area is mainly derived from the atmospheric precipitation,which through the weathered zone in the middle of the central area of the mining area into the underground and recharge the groundwater.Some of them continue to migrate to the deep part,which is a part of the middle and deep groundwater system,and participate in the circulation system of the regional middle and deep groundwater.The preliminary study shows that the circulation movement of the shallow groundwater is more frequent,while,the deep groundwater circulation is relatively slow.In the thesis,the hydraulic connection between the deep mining area and the water body(surface water body,aquifer,the water of the water,the precipitation of the atmosphere,etc.)was evaluated,based on the hydrogeological conditions,the chemical characteristics of the groundwater,and the trace elements of the multiple tracer test.The results shows that:(1)Under the natural conditions,copper mining elevation is above the drainage datum plane,groundwater excretes to Ting River.Ting River does not constitute a source of water filling mining area.When the mining area is to the deep,underground water continued to decline,and Ting River may be through tectonic fracture zone,weathering fractured zone and artificial cracks and into the tunnel system,increasing the water yield of mine(2)The groundwater level changed little,the dynamic water level is relatively stable.And the surface water mainly affected by seasonal effects is more obvious than groundwater dynamic(3)The analysis of groundwater system and water content in the deep copper mine shows that fissure water has little effect on the future mining(4)Chemical characteristics of water:salinity changed from low to high,HCO3 changes from high to low,SO4 and Cl changes from low to high.Ca changes from high to low,Na+K is from low to high.Namely with the increase of depth of groundwater circulation,leaching strengthened,groundwater salinity increased,mineralization degree increased and the lower solution components(HCO3,Ca)gradually decreased,while the high solubility of the components(SO4,Cl,Na+K)gradually increased.At present,the Ting River only reservoir lateral recharge on reservoir groundwater,but has not affected the mine tunnel gushing water.The river water flowing backward or Ting River affecting hydraulic contact deep development project is very weak.The gushing water of the deep development of roadway engineering is still mainly from the bedrock fissure water caused the by rainfall.There is a small amount of infiltrated water because of open pit mines during artificial mining activities in the shallow area.Based on the above research results,we have a deeper understanding of the hydraulic connection of the deep mining copper deposit and Ting River.It has an important guiding significance on the deep development of engineering construction,drainage equipment selecting,daily hydrogeological work and future flood controlling work. |
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