基于环境同位素和水化学特征识别矿井涌水来源  

Identifying the source of the groundwater based on the characteristics of environmental isotopes and water chemistry

作　　者：陈建平[1] 潘光义 吴丽[1] 杨海 CHEN Jianping;PAN Guangyi;WU Li;YANG Hal(Liaoning Technical University, Fuxin, 123000, China)

机构地区：[1]辽宁工程技术大学,阜新123000

出　　处：《环境化学》2018年第6期1410-1420,共11页Environmental Chemistry

基　　金：国家自然科学基金(51404134)资助~~

摘　　要：隆德煤矿2-2煤层开采受顶板第四系沙层水和基岩裂隙水的威胁.采动影响破坏了地下水的原始水动力场,仅利用地下水动力学方法难以准确确定地下水来源.利用不同含水层水中环境同位素的差异,结合水化学分析可解释13C同位素异常的形成机制、识别隆德矿井涌水来源,为矿井涌水量预测、水害防治提供依据.与侏罗纪基岩裂隙水相比,第四系沙层水常规水化学成分差异不明显,但有高现代碳百分比(pMC)、氘(D)略微富集的特征.分析结果显示,1-1煤层开口疏放水、205采空区积水和203工作面顶板水为第四系沙层水与基岩裂隙水的混合产物,其中,砂层水混入比例分别为27.77%、23.8%和4.21%.表明同位素结合水化学因子分析是正确识别矿井涌水来源、混合比例的有效手段.In Longde coal mine,the mining of 2-2 coal seam is faced with the calamity of groundwater inflows induced by quaternary sand aquifer and water-bearing bedrock fissure.Owing to the out-of-balance of virgin groundwater flow field caused by coal mining,it is difficult to determine the origin of mine inflow by groundwater dynamics method alone.Using the differences of environmental isotopes in aquifer groundwater,combined with hydro-chemical analysis,can be identified the formation mechanism of ^13C abnormity can be interpreted and the water supplies in Longde colliery.This method can provide the basis for forecasting mine groundwater inflow and preventing and combating groundwater inflows.There was no significant difference in conventional hydro-chemical ions between the sand layer water and that from Jurassic bedrock fissures.Consequently,water samples of the quaternary sand layer were characterized by high percent modern carbon（p MC） and slightly enriched deuterium（D）.Water samples from dewatering borehole in 1-1 coal seam,205 gob area and 203 coalface roof were mixed by sand layer water and bedrock ＂ fissure water,with the proportion of sand layer water being 27.77%,＂ 23.8% and 4.21%,respectively.It was shown that the combination of hydro-chemical analysis and isotopes was an effective method to identify the source of inflow-water and the mixing ratio.

关 键 词：环境同位素 水化学 因子分析 水源识别 煤矿 

分 类 号：TD742[矿业工程—矿井通风与安全]