榆神府地区煤炭开采对地下水资源的影响

(西安科技大学 地质与环境学院,陕西 西安 710054)

地质资源与地质工程; 地下水; 瞬变电磁; 地下水数值模拟; 覆岩含水性; 地下水流场

Influence of coal mining on groundwater resources in Yushenfu Area
LIU Ning,ZHAO Xiao-guang,XIE Haijun,LI Yu

(College of Geology and Environment,Xi'an University of Science and Technology,Xi'an 710054,China)

geological resources and geological engineering; groundwater; time domain electromagnetic methods; groundwater model system simulation; groundwater flow field

DOI: 10.13800/j.cnki.xakjdxxb.2019.0111

备注

通过对覆岩含水性和地下水流场的研究,探讨了榆神府地区煤炭开采对地下水资源造成的影响。通过公式估算法、瞬变电磁法和GMS地下水数值模拟法,探讨了榆神府地区煤炭开采对地下水资源量、上覆岩层含水性和地下水流场的影响。研究发现煤炭开采会引起地下水水位下降,覆岩含水性降低,引起含水渗漏现象,最终改变原始地下水流畅,形成地下水降落漏斗。榆神府地区在产煤矿矿井水排水量(2014年)约为50×106 m3/a,其中有46.6%的矿井水会作为生产用水回用,随着在建和规划煤矿逐步建成,地下水外排量会增加140×106 m3/a,其中生产回用水量占矿井总排水量的50%以上; 上覆岩层含水性在煤炭开采的不同开采阶段表现出不一样的特征,开采前覆岩含水性良好,开采中覆岩含水性逐渐降低,开采结束后,覆岩含水性会逐渐恢复; GMS模拟结果显示,煤炭开采初期地下水水位会以20 m/a的速度快速下降,到2018年已经形成地下水降落漏斗,2028年漏斗范围持续发展,到2048年,降落漏斗范围基本稳定,并形成以井田北部为中心的新地下水流动场。

The influence of coal mining on groundwater in Yushenfu is discussed by studying the aquosity of overburden rock and groundwater flow field.The influence of coal mining on the amount of groundwater resources,the aquosity of overburden rock and the groundwater flow field in Yushenfu is investigated through formula estimation,transient electromagnetic method and GMS groundwater numerical simulation method.It is found that coal mining will cause the decline of groundwater level,reduce the aquosity of overburden rock,cause water leakage,and eventually change the flow of the original ground water to form a groundwater cone of depression.The displacement of mine water in Yushenfu(2014)is about50×106 m3/a,of which 47.6% of the mine water will be used as the production water.With the construction and planning of the coal mine,the external displacement of the groundwater will increase by 140×106 m3/a,of which 50% of the total amount of displacement of mine water will be used as production water.The aquosity of overburden rock shows different characteristics in the different stages of coal mining.The aquosity of overburden rock before mining is good,then it will gradually reduce,and after the mining it will be gradually restored.The GMS simulation results show that the groundwater level in the early stage of coal mining will fall sharply with the speed of 20 m/a,and the groundwater cone of depression has been formed by 2018.In 2028,the range of the cone of depression will continue to expand.By 2048,the range of the cone of depression is basically stable,and the new groundwater cone of depression is formed in the north of the mine field.