杭来湾煤矿301盘区分层限高开采对松散层潜水的影响

Influence of layered height limit mining to unconsolidated phreatic water in Hanglaiwan Coal Mine

杭来湾煤矿位于陕北生态脆弱的保水采煤区。通过对比和分析杭来湾煤矿301盘区采空区与未采区松散层潜水水位、采空区典型植物的长势以及地表水体等因素的变化特征。研究表明,采用分层限高开采采空区地表有明显的下沉和裂缝,但对矿区生态水位的影响程度较小,农田的耕种条件未受到显著影响,地表生态环境未受到严重破坏;工作面回采后松散层潜水水位虽出现了一定幅度的下降,但开采过后一段时间松散层潜水水位逐渐稳定,实现了煤炭资源开发与生态环境保护协调发展的目标,达到了保水采煤的目的。研究对矿区类似条件的矿井保水采煤具有借鉴意义。

Hanglaiwan Coal Mine is located in the fragile ecological water-preserved mining area in Northern Shaanxi.By comparing and analyzing the variation characteristics of unconsolidated phreatic water level,growth trend of typical plants over mined-out area and surface water body in No.301 panel and unmined area in Hanglaiwan Coal Mine,it is determined that by using layered height limit mining,first of all,the surface has obvious subsidence and cracks,but the impact on the ecological water level of the mining area is small,the farming conditions of the farmland are not significantly affected,and the surface ecological environment is not seriously damaged,secondly,although the unconsolidated phreatic water level after coal mining has declined to a certain extent,the unconsolidated phreatic water level is gradually stable for a period of time after mining,which can realize the target of coordinated development of coal resource development and ecological environment protection,and achieve the goal of water-preserved mining.The research has reference significance for the similar conditions of coal mining.