Research On Complementary Relationship Between Storage Water And Groundwater And Allowable Exploitation In Xinglongzhuang Coal-mining Subsidence Area

Xinglong coal mine is the national key construction projects of the sixth five year plan.Itis a large modern mine and first built with an annual output of3million t, Mine area of54km~2and geological reserves of780million t. The development of coal mining industry has madegreat contribution to the local economic. However, it also caused a certain impact on thesurrounding environment and part of the ground subside because of the long-term sustainableexploitation of coal resources. The subsidence area stores part of water resources due to therecharge from the perennial precipitation and groundwater. If the water resources can be usedcorrectly and reasonably, it can become one of the effective way to solve the problem ofmining production and living water demand. Therefore, it is necessary to study on thecomplementary relationship between storage water and groundwater recharge, moreover, toexplore the rules of recharge and to make water resource dispatching scheme of thecomprehensive research area.First of all, the subsidence area storage scope and capacity is exploratived in this paper.We can frame the basic morphology and position of the subsidence area with the handheldGPS measuring instrument. By surveying the1～6subsidence zone, we get the conclusionthat their formation storage capacity surface area are1.17km~2,0.81km~2,0.64km~2,0.58km~2,0.22km~2and0.59km~2, a total of4.0km~2. This paper receive the depth and distance of themonitoring surface by using the moving boat sounder and calculate its storage capacityaccording to the irregular storage The total capacity of the six subsidence area storage is20.578millions m3.Secondly, this paper evaluates the groundwater resources in the research area and waterresources on the Si River are evaluated. This paper demonstrates the possibility of waterdiversion section from Si River. It provides a support for the set of the combined waterdispatching scheme.Thirdly, the water level fluctuation method is used to analyze the groundwater rechargeof the study area. We can draw the contour map of groundwater level with the help of Sufersoftware and use the Darcy equation for the quantitative calculation of the complementaryrelationship between subsidence and groundwater. The results show that, the average annual recharge of the study area is147.39mm.The variation of the groundwater recharge isdecreasing from northeast to southwest direction, consistent with the groundwater flowdirection. The relationship between the groundwater recharge and rainfall is close. Thegroundwater recharge generally increases with rainfall, however, after the rainfall reaches950mm, the change trend will not increase obviously. But the relationship with the burieddepth of groundwater is first increased and then decreased. The groundwater rechargeincreases along with the increase of buried depth in the area of less than4m, but it decreaseswith the increase of buried depth in the area of more than4m. In terms of the complementaryrelationship with groundwater, the six subsidence zone in the research area is recharged bygroundwater from June to November, and around November to May in the following year,subsidence area recharge groundwater water. But overall, the surrounding of subsided waterarea of groundwater recharge is greater than the lateral discharge subsided water area on thesurrounding groundwater recharge. Therefore, the sources of supply can be guaranteed afterthe water use of the subsidence area.Finally, three suggestions that water diversion, aquaculture, tourism industry are madefor the utilization of water in subsidence area.According to the present situation of coal mining subsidence area in Xinglong Zhuang,this paper discusses the reliability and feasibility of water storage, water supply based on theanalysis of surface runoff, groundwater characteristics and rules of collapse. It not only canimprove the current low utilization ratio of water resources problems in the subsidence area,but also can provide a new way to realize social, economic and ecological benefit forcomprehensive management of collapse area.