山西省朔州市平朔矿区井工三矿构造特征分析

Structural Features Analysis in Underground Coalmine No. 3,Pingshuo Mining Area,Shuozhou City,Shanxi Province

井田构造控制的准确与否直接影响到矿井设计、采区布置的实效性和煤炭开采的难易程度,而采掘工程检验并反馈勘查工作。勘查中我们详细观测编录了钻孔岩心,对以往钻孔资料和生产揭露的地质资料全部进行了认真的分析研究,对以往构造进行了梳理,结合区域构造演化对井田构造发育规律进行了分析,对井田构造有了全新的认识。井工三矿位于平朔矿区北端,印支期华北板块与内蒙地轴南北向的碰撞,奠定了井田近东西向的构造主体;燕山期北西-北北西向挤压扭转,导致东坡向斜向北扭动与OX-25向斜错开,其它背向斜轴向扭转,形成北西-北北西向雁列式断层;喜山期北北西-南南东向的拉张,造就了北东东向平行排列的断层组合。晚期断层产状比较接近,落差相对不大,断层面明显,没有断层破碎带;而其它前期形成的断层,受到后来构造运动的多次改造及重新活化,多期构造作用叠加使得断层线扭曲、断层破碎带及断层附近裂隙均较为发育。井田主体向斜和主要断层走向近东西向,与工作面近似垂直,对工作面布置产生很大影响。

Whether accurate or not of minefield structure control can directly impact mine design,winning district layout effectiveness and coal extraction difficulty level,while the mining engineering inspection can feed back to exploration design modification.During exploration,we have observed,extracted and edited borehole cores in detail,carried out careful analysis and research for whole previous drilling data and production revealed geological information.To previous cognized structures have carried out sorting,combined with analysis of regional tectonic evolution impact on minefield structural development pattern,and thus grasped a new understanding on minefield structures.The underground coalmine No.3 is located on the north end of Pingshuo mining area.The NS collision between the North China plate and Inner Mongolia earth axis during the Indo-Chinese epoch has laid the foundation of minefield near EW structural main body.The Yanshanian NW-NNW compresso-shear has caused the Dongpo syncline torqued northward and staggered one another with OX-25 syncline;other folds axial torsion formed NW-NNW en echelon faults.The Himalayan NNW-SSE extension has made NEE parallel fault complex.Late-stage faults have nearer occurrences,relatively smaller throws,obvious fault planes,without shattered fault zone;while other previous formed faults have come under later tectogenesis reform and reactivation,multistage tectonism stacking made fault line distorted,shattered fault zone and fault vicinity fissures are all well developed.Strikes of minefield principal syncline and fault are near EW,approximately perpendicular to working faces thus have major impact on working face layout.