Progress of ecological remediation technology of mining-damaged aquifer
JU Jinfeng,LI Quansheng,XU Jialin,CAO Zhiguo
中国矿业大学 矿山互联网应用技术国家地方联合工程实验室中国矿业大学 物联网(感知矿山)研究中心煤炭开采水资源保护与利用国家重点实验室煤炭资源与安全开采国家重点实验室
地下采煤活动显著影响、甚至改变地下水系环境,对区域生态环境和矿井安全生产极为不利;研究实施促进采损含水层恢复其生态赋存状态的修复技术和方法对实现煤矿绿色开采意义重大。受采煤扰动程度差异的影响,不同采损条件对应其含水层的生态功能修复策略也不同。含水层未受采动裂隙或破坏带沟通时,其赋水仅发生区域富集和流场变迁,不出现水体流失,但易出现地下潜水出露地表形成积水的不利局面,多以景观改造对其开展生态治理。含水层受采动破坏时,则形成了注浆封堵采动含水层导水通道以阻隔水源补给或流失路径的修复技术与方法,成功实现了底板采动含水层的加固与改造,但应用顶板采动含水层注浆修复时,常面临“注不进”、“堵不住”、“成本高”等问题;据此利用采动岩体导水裂隙易呈现水渗流能力自然降低的“自修复”特性和规律,探索提出了人工引导裂隙自修复的含水层生态恢复方法。针对已有修复手段侧重以“改造”或“防治”思路,从近自然生态修复角度对采动含水层生态功能修复尚需研究的问题进行了总结,提出了利用裂隙自修复特性开展含水层引导恢复研究的必要性。
Underground water system is seriously affected,even changed by mining activities,which is extremely detrimental to the regional ecological environment and safe mining.As for green mining,it is of great value to explore the environment restoration technique and method for promoting aquifer recovered.Affected by the different-degree mining disturbances,the ecological restoration strategies vary in different mining conditions.Underground water may enrich regionally or flow into another field,as aquifer is not connected with mining fractures,without any outflow.According to this,an adverse situation may be caused that stagnant water forms on ground surface due to the level of underground water beyond surface.Thus,ecological management is often carried out to achieve landscape reconstruction.However,considering aquifer is connected to fractures,some protective technique was proposed and applied to block channels for water replenishment and outflow through grout injection,which achieved reinforcement and reconstruction of aquifer in floor.Some problems may arise during aquifer restoration practice in roof,including grout injection failure,blocking failure and high cost.Regarding this,a manually guided aquifer self-restoration method was proposed in this paper,based on the self-decrease flowing capacity of fractures in aquifer rocks.Given the current states that existing method focus on treating aquifer restoration with ides of “reconstruction” and “prevention”,further studies about aquifer restoration technique were proposed in this paper from the perspective of naturally ecological restoration.It is necessary to use the self-healing character of the rock fractures to lead the aquifer to return to its normal ecological state.
green mining;aquifer remediation;water-conducting passageway;near-natural ecological restoration;self-healing
主办单位:煤炭科学研究总院有限公司 中国煤炭学会学术期刊工作委员会