中国岩溶2016，Vol.35Issue(2)：179-189,11.DOI:10.11932/karst20160207
湖南宁乡大成桥充水矿山疏干区岩溶系统水气压力监测及突变特征
Character of water or barometric pressure jump within karst conduit in large strong drainage area of karst water filling mine in Dachengqiao,Ningxiang,Hunan
摘要
Abstract
Meitanba Coal Mine,Hunan Province,is one of the coal mines famous for karst water flooding in China.Its current mining level is about -400 m and the quantity of pumped water from the mine is about 1 1 000 m3 per hour.For long,due to the continuous mine water drainage a great groundwater depression cone with an area of 21 9.1 9 km2 has been formed.Generally,most sinkholes induced by the mine drainage mainly occur in three stages,which include drainage beginning,groundwater level dropping beneath the bed-rock surface and the occurrence of water inrush incidents,so sinkholes would not be appeared in dewatering zone.But more and more sinkholes have formed in recent years,even though the authorities have taken a se-ries of countermeasures to control these karst hazards.In order to analyze the mechanism of sinkhole forma-tion and help the government make decision,the Dachengqiao region was selected as a pilot site to identify the dynamic source of sinkholes.Data derived from the monitoring of water or barometric pressure within karst conduit show that the fluctuation of barometric pressures in the dewatering zone is extremely signifi-cant with a maximum fluctuation range of 54.72 meters happens in a year and a maximum instant variation velocity of 70.6 cm/min,which is believed to the air blasting and soil collapsing triggered by the sinkhole collapses that create the abrupt jumps of the barometric pressure.关键词
岩溶塌陷/水气压力监测/大水矿床疏干/湖南煤炭坝Key words
karst collapse/monitoring of water and gas/drainage of karst water filling mine/Meitanba分类
天文与地球科学引用本文复制引用
蒋小珍,雷明堂,管振德..湖南宁乡大成桥充水矿山疏干区岩溶系统水气压力监测及突变特征[J].中国岩溶,2016,35(2):179-189,11.基金项目
国土资源部公益性行业科研专项经费项目(201211083) （201211083）
国家自然科学基金(41472298) （41472298）
