许昌铁矿矿区地面塌陷成因分析

ORIGIN OF GROUND COLLAPSE AT THE XUCHANG IRON MINE

在对许昌铁矿矿区地质环境条件、矿山开采现状、地面塌陷特征调查的基础上,通过分析金属矿山塌陷机理,从新生界盖层特征、矿体顶板及围岩工程地质性质、矿山排水等因素论证了矿区塌陷成因。认为松散的第四系地层结构与微弱胶结新近系多层地层结构有利于地面塌陷的形成,矿体顶板、围岩节理裂隙发育密集,遇水易形成冒落带、导水裂隙带,而部分地段冒落带、导水裂隙带最大高度大于矿层顶板厚度,矿坑排水量的增加是矿区地面塌陷或陷洞形成的主导因素,并提出了矿区地面塌陷防治对策。

Based on investigation of the subsidence characteristics of geological conditions,Xuchang iron ore mining area,mining situation,on the ground,through the analysis of metal mine collapse mechanism,cover characteristics,from the Cenozoic ore body and surrounding rock roof engineering geological properties,mine drainage and other factors that cause mine subsidence area.That the Quaternary strata structure of loose and Weak cementation Neogene strata stratum structure is conducive to the formation of ground subsidence,orebody roof,rock cranny dense,water and easy soft,caving zone and water flowing fractured zone,and part of the caving zone height is greater than the thickness of the seam roof water flowing fractured zone.The increase of mine drainage is the dominant factor for mining ground subsidence or sinkhole formation,and put forward the Countermeasures of mining ground subsidence.