Numerical Simulation And Optimal Scheduleof Daliuta-mining-area Distributed Underground Reservoir

On Jin-Shan-Meng-Gan-Ning area,there owns 65% of the country’s coal. However, the shortage of water resources is short board development in this area, with only occupying 3.9% of the whole country’s water resources, andhas been themain limiting factor on sustainable development road for the area.Facing the contradiction between the shortage of water resources and the development of production, Shendong Group innovatively adopts distributed underground reservoir engineering, with storing the coal mining water in the connected mined tunnels with each other and the space of voids in the upper three rocks and completing the purification and recycling use at the same time.To reasonably and efficiently use water resources in underground reservoir, this paper build up numerical simulation and optimal schedule of daliuta-mining-area distributed underground reservoir. The research of this paper includes as:(1)Determine the storage capacity-level relationship curve of distributed underground reservoir, because the relationship curve lays foundation condition for reservoir planning. Using the formula 0V =mVand according to the method of layered accumulation and with the help of the search function in Excel software, gainthe relationship of storage capacity-level. The storage capacity of 7m level is 235.18×104 m3, basically agreeing with measured data230×104 m3.(2)Build up the groundwater numerical simulation modeling of the reservoir and predict mine water inrush, for providing basic data for joint scheduling. With the help of MODFLOW module of GMS software tools, build up a numerical simulation model of groundwater reservoir, calculating the mine water inflow. Then, using GM(1,1) model with the measured inflow of data from 2008 to 2012, predict the mine water inflow of from 2013 to 2020. Compared with two models, the result is good. After correcting, obtain average daily mine water inrush for every month in many years.(3) Joint operation of underground reservoir commissioning and gain daily reasonably average adjustable amount of water. According to the mine water inflow, do the joint operation, aimed at the reservoir level coming back to the original level after a hydrological year. The average daily water of the reservoir can supply 11058 m3/d. Analysising results, reservoir storage capacity is strong, because the water level of the reservoirs is not dramatic duringthe peak of mine water inflow.(4) According to the user’s requirement for water and aiming at the lowest water supply and cost, use linprog function in MATLAB to schedule optimization of water resources in mining area.Analysis of the relationship between water supply and demand in mining areas, and schedule to arrange the water resources of the reservoirwith 11058 m3/d. Small amount of water is for life, most for production and industry after process, part as the ecological water. The shortage of water for life is supplemented by the network of running water. From 2015 to 2020, the shortage water is respectively640m3,929 m3,1191m3,1574m3,1796m3,and2039 m3.