摘要
烧变岩含水层的水化学特征研究有助于判别各含水层间的水力联系。以神府矿区张家峁矿井为研究对象,通过采集风化基岩、基岩、2^(-2)煤烧变岩、3^(-1)煤烧变岩含水层水样共29组,综合利用统计分析、Piper三线图、Gibbs模型、混合模型等方法,分析研究区的水化学特征及其控制因素,确定了主要离子的来源,据此识别了各含水层的接触关系。结果表明:风化基岩和2^(-2)煤烧变岩含水层的TDS(溶解性总固体)接近,略低于基岩含水层的TDS,3^(-1)煤烧变岩含水层的TDS最高,基本呈现了随着含水层埋深的增大TDS逐步升高的趋势;风化基岩和2^(-2)煤烧变岩含水层阳离子以Ca^(2+)为主,基岩和3^(-1)煤烧变岩含水层阳离子以Na^(+)为主;风化基岩、2^(-2)煤烧变岩、3^(-1)煤烧变岩含水层阴离子均以HCO_(3)^(-)为主,而基岩含水层则以HCO_(3)^(-)和SO_(4)^(2-)为主;风化基岩、2^(-2)煤烧变岩、3^(-1)煤烧变岩含水层水化学类型主要为HCO_(3)^(-)Ca型、HCO_(3)^(-)Ca和HCO_(3)^(-)Ca·Mg型、HCO_(3)^(-)Ca和HCO_(3)^(-)Na·Mg;风化基岩和2^(-2)煤烧变岩含水层水化学成分主要受水岩作用控制,而基岩和3^(-1)煤烧变岩含水层水化学成分主要受到水岩作用以及浓缩作用的共同影响;3^(-1)煤烧变岩、基岩、风化基岩和2^(-2)煤烧变岩含水层主要离子分别来源于硅酸岩盐的溶解、硅酸盐岩和蒸发岩盐的溶解、硅酸盐岩和碳酸岩盐的风化溶解,同时各含水层地下水害发生了反向阳离子交换作用;风化基岩和2^(-2)煤烧变岩含水层离子组成接近,存在较强的水力联系,可能在局部存在直接接触关系,与3^(-1)煤烧变岩含水层离子组成有差别,风化基岩和2^(-2)煤烧变岩之间存在一定的阻隔层,且水力联系微弱。
The study of the hydro-chemical characteristics of burnt rock aquifers helps to distinguish the hydraulic connections between different aquifers.Taking Zhangjiamao Coal Mine in Shenfu Mining Area as an example,29 groups of water samples were collected from weathered bedrock,bedrock,2^(-2)coal burned rock and 3^(-1)coal burned rock aquifers,and the hydro-chemical characteristics and control factors in the study area were analyzed by comprehensive use of statistical analysis,Piper trilinear diagram,Gibbs model and hybrid model,and the source of main ions was determined,based on which the contact relationship of each aquifer was identified.The results indicated that the total dissolved solids(TDS)of the weathered bedrock and the 2^(-2)coal burnt rock aquifer were close,slightly lower than the TDS of the bedrock aquifer,while the TDS of the 3^(-1)coal burnt rock aquifer was the highest,showing a trend of gradually increasing TDS with the increase of aquifer depth.The cations in the weathered bedrock and the 2^(-2)coal burnt rock aquifer were mainly Ca^(2+),while the cations in the bedrock and 3^(-1)coal burnt rock aquifer were mainly Na^(+);the anions in the weathered bedrock,2^(-2)coal burnt rock,and 3^(-1)coal burnt rock aquifers were mainly HCO_(3)^(-),while the bedrock aquifers were mainly HCO_(3)^(-),and SO_(4)^(2-).The hydro-chemical types of weathered bedrock,2^(-2)coal burnt rock,and 3^(-1)coal burnt rock aquifers were mainly HCO_(3)^(-)Ca type,HCO_(3)^(-)Ca and HCO_(3)^(-)Ca·Mg type,HCO_(3)^(-)Ca and HCO_(3)^(-)Na·Mg type.The hydro-chemical composition of weathered bedrock and 2^(-2)coal burnt rock aquifer was mainly controlled by water rock interaction,while the hydro-chemical composition of bedrock and 3^(-1)coal burnt rock aquifer was mainly influenced by both water rock interaction and concentration.The main ions of 3^(-1)coal burned rock,bedrock,weathered bedrock and 2^(-2)coal burned rock aquifer were respectively from the dissolution of silicate rock salt,the dissolution of silicate rock and evaporite rock salt,and the weathering dissolution of silicate rock and carbonate rock salt.At the same time,the reverse cation exchange interaction effect occurred in the groundwater disasters of each aquifer.Multiple indicator results showed that the ion composition of the weathered bedrock and the aquifer of the 2^(-2)coal fired rock was similar,and there was a strong hydraulic connection.There may be a direct contact relationship locally,which is different from the ion composition of the aquifer of the 3^(-1)coal fired rock.There is a certain barrier layer between them,and the hydraulic connection between them is weak.
作者
胡俭
呼少平
姬中奎
杨帆
王海
郑文斌
薛小渊
陈盼
韩强
HU Jian;HU Shaoping;JI Zhongkui;YANG Fan;WANG Hai;ZHENG Wenbin;XUE Xiaoyuan;CHEN Pan;HAN Qiang(Shaanxi Coal Group Shenmu Zhangjiamao Mining Co.,Ltd.,Yulin 719316,China;China Coal Technology and Engineering Group Xi’an Research Institute(Group)Co.,Ltd.,Xi’an 710077,China)
出处
《煤矿安全》
CAS
北大核心
2024年第8期167-174,共8页
Safety in Coal Mines
基金
中国煤炭科工集团科技创新重点资助项目(2024-TD-ZD009)
中煤科工西安研究院(集团)有限公司科技创新基金资助项目(2022XAYJS06,2024XAYJS06)。
关键词
烧变岩
水化学特征
水力联系
水岩作用
水害防治
burnt rock
hydro-chemical characteristics
hydraulic connection
water rock interaction
water hazard control
