渭北煤田属华北型石炭二迭纪煤田,煤系基底普遍受奥陶系厚层石灰岩岩溶裂隙水威胁,曾多次发生煤层底板突水。韩城矿区地处渭北煤田东北部,受灰岩水威胁较为严重。从74年以来,韩城曾先后发生14次突水,其中瞬时最大涌水量1.2万 M~2/b,并淹没矿井。分析研究煤层底板奥灰突水问题,探讨其突水规律,对矿井的深部开采和安全生产都具有实际意义。本文就这方面做一点尝试,不妥之处请商榷。一、矿区地质水文地质概况韩城矿区位于祁吕贺山字型构造前弧东 Coal Weibei coal field is North China Carboniferous Permian coalfield, coal basement generally affected by thick limestone karst fissure water of Ordovician threat, there have been many coal floor water inrush. Hancheng mining area is located in the northeast of Weibei coalfield, the threat of limestone water is more serious. Since 74 years, there have been 14 water inrnings successively in Hancheng, of which the instantaneous maximum water inflow was 12,000 M ~ 2 / b and inundated the mine. It is of practical significance to analyze and study the problem of Ordovician water inrush from coal seam floor and to discuss its water inrush rule, which is of practical significance to the deep mining and safe production of the mine. This article to do some try in this regard, the wrong place to discuss. I. Geology and Geology of Mining Area Hancheng Mining Area is located in the arch arc east of Qilu He Mountain