| 淮南采煤沉陷区积水过程地下水作用机制 |
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| 引用本文： | 陆垂裕,陆春辉,李慧,柳炳俊,孙青言,李翠.淮南采煤沉陷区积水过程地下水作用机制[J].农业工程学报,2015,31(10):122-131. |
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| 作者姓名： | 陆垂裕 陆春辉 李慧 柳炳俊 孙青言 李翠 |
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| 作者单位： | 1. 中国水利水电科学研究院流域水循环模拟与调控国家重点实验室,北京 100038;,2. 煤矿生态保护国家工程实验室,淮南 232001;,1. 中国水利水电科学研究院流域水循环模拟与调控国家重点实验室,北京 100038;,2. 煤矿生态保护国家工程实验室,淮南 232001;,1. 中国水利水电科学研究院流域水循环模拟与调控国家重点实验室,北京 100038;,2. 煤矿生态保护国家工程实验室,淮南 232001; |
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| 基金项目： | 财政部"节水型社会建设"专项（水综节水[2006]50）;国家水污染控制与治理重大科技专项（2012ZX07601001）;中国工程院重大咨询项目（2012-ZD-13-8）;淮南矿业集团2012年科学技术项目（HKKY-(2012)-004） |
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| 摘 要： | 高潜水位采煤沉陷区容易积水,地下水在其中所起的作用相关研究不足。该文借助相关水文推理和数值模拟分析,对淮南典型孤立采煤沉陷区的地下水作用机制进行了辨析,取得的主要研究结论为:当地降水、蒸发水文条件是孤立沉陷区积水的控制性因素,一般年份下没有地下水的补给作用其积水面积比也能达到71%左右;由于淮北平原地势平缓,地下水径流微弱,水平衡定量分析表明典型沉陷区的地下水补给量仅占其积水来源百分之几的数量级;在一个水文年内,地下水与采煤沉陷区积水间的作用过程具有明显的阶段性特征,在汛期基本上表现为沉陷区积水向地下水的净渗漏,在非汛期基本上表现为地下水净补给。该文可为淮南矿区及中国华东类似采煤沉陷区的水资源利用研究提供一定的参考。
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| 关 键 词： | 地下水 水循环 降水 淮南矿区 采煤沉陷 积水机理 水文模拟 |
| 收稿时间： | 2014/12/5 0:00:00 |
| 修稿时间： | 4/5/2015 12:00:00 AM |
Groundwater influencing mechanism in water-ponding process of Huainan coal mining subsidence area |
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| Lu Chuiyu,Lu Chunhui,Li Hui,Liu Bingjun,Sun Qingyan and Li Cui.Groundwater influencing mechanism in water-ponding process of Huainan coal mining subsidence area[J].Transactions of the Chinese Society of Agricultural Engineering,2015,31(10):122-131. |
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| Authors: | Lu Chuiyu Lu Chunhui Li Hui Liu Bingjun Sun Qingyan and Li Cui |
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| Institution: | 1. China Institute of Water Resources and Hydropower Research, State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, Beijing 100038, China,2. State Key Lab of Mine Ecological Environment Protection of Huainan Coal Mining Group Corporation Ltd, Huainan 232001, China,1. China Institute of Water Resources and Hydropower Research, State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, Beijing 100038, China,2. State Key Lab of Mine Ecological Environment Protection of Huainan Coal Mining Group Corporation Ltd, Huainan 232001, China,1. China Institute of Water Resources and Hydropower Research, State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, Beijing 100038, China and 2. State Key Lab of Mine Ecological Environment Protection of Huainan Coal Mining Group Corporation Ltd, Huainan 232001, China |
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| Abstract: | Ground subsidence caused by coal mining activity commonly exists in the coal belt of China eastern plain area. Subsidence area is on average 0.18-0.33 hm2 per ten thousand tons of coal mining. The subsidence coefficient there is about 0.8-0.9, which means coal mining of one cubic meters result in ground subsidence of 0.8-0.9 m3. In the environment with high groundwater level, the situation is worse, for once the ground sinks due to coal mining, large area of water-ponding occurs. Due to limited source of backfill material, high cost, the long time needed to wait for the stable state of subsidence and other factors, traditional land remediation pattern for coal mining subsidence in China faces difficulties, and land reclamation rate by now is only 12%. From other point of view, coal mining subsidence area is potentially useful water storage structure, and recently some researchers start to study a new remediation pattern of using them for water resource development. However, a prerequisite for the new pattern is to learn where the water comes from. Related to the environment background with high groundwater level, it seems that water stored in coal mining subsidence areas may mainly come from groundwater, but by now this viewpoint has not been proved in detail yet. The article researched the law of water-ponding process in coal mining subsidence area by means of hydrological reasoning and water cycle simulation. In this paper, Huainan coal mining area is taken as study area, which is the largest coal production base of East China area with its coal reserves accounting for 74% of Anhui Province, and 50% of East China area. According to statistical data in 2010, after long-term coal mining activity of dozens of years, the maximum subsidence depth of Huainan coal mining area has reached 7.6m, and the ground subsidence area has reached 108.3 km2, along with the total subsidence volume of 0.314?109 m3. Some meaningful conclusions are drawn through our study. Firstly, the reason that the ground subsidence area is easily to be ponded with a large area of water is due to the close volumes of annual precipitation and evaporation in Huainan district. Water balance analysis reveals that even though there is no groundwater replenishment, an isolated subsidence area there still can reach a large water-ponding area ratio of about 71% in normal year due to the supply of precipitation falling on water-ponding area and runoff yielded from non-ponding area of the isolated subsidence area. And hydrological reasoning indicates that the higher the ratio of precipitation to evaporation, the higher the ratio of water-ponding area to subsidence area. Secondly, proved by both hydrological reasoning and water cycle simulation, due to the flat terrain in Huaibei plain area where the Huainan coal mining subsidence areas are located, the lateral flow of groundwater is relatively weak for lack of gradient driving force, and the ratio of groundwater supply in ponding water of coal mining subsidence area can't be too high. As an example of a named Gubeiguqiao subsidence area in our study, the ratio of ground water supply in its ponded water may only account for 4.0%, however, precipitation falling on its water-ponding area accounts for 86.6% and runoff yielded from non-ponding area within its subsidence area accounts for 9.4%. Thirdly, transformation between groundwater and ponded water in coal mining subsidence area depends on the water level difference of groundwater and ponded water, rather than the one-sided groundwater level. Hydrological simulation reveals that there are obvious stage characteristics between the transformation of groundwater and ponded water in a hydrological year. The law is that water quantity leaking from ponded water to groundwater is more than that recharging from the groundwater to ponded water in the flood season, and in non-flood season the situation is in the opposite direction |
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| Keywords: | ground water water recycling precipitation Huainan coal mining area subsidence due to coal mining water-ponding mechanism water cycle simulation |
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