古叙矿区石屏二矿层间滑动构造特征及形成机制

Interlayer-gliding Structure Characteristics and Formation Mechanism in Shiping No.2 Coalmine,Guxu Mining Area

据大量钻孔资料及生产矿井揭露,在石屏二矿含煤地层龙潭组中部发育一压性的层间滑动构造,滑动面呈舒缓波状穿行于C19煤层及其顶底板岩层中,受其影响,C19煤层原生构造遭受破坏,煤层厚度变化大,且煤的灰分、瓦斯含量、瓦斯压力增高。区内层间滑动构造既有推覆型又有滑覆型,总体表现为推覆型,该构造的形成主要受印支期南东、北西向水平剪切挤压应力的作用,同时受特殊的硬-软-硬地层剖面结构以及高瓦斯压力煤层的气垫效应和地下水的浮力效应影响。

According to large amount boreholes and production coalmine disclosed data, a compressive interlayer-gliding structure had been developed in the middle part of the Longtan Formation in the Shiping No.2 coalmine. The gliding plane presents gentle eorraga＇ting cut through coal seam C19 and its roof and floor strata, under its impact, primary structm＇e of coal seam Cl9 had t）een destructed, coal seam thickness varied greatly, in addition, coal ash content, gas content and gas pressure increased. The interlayer- gliding structure in the area has both nappe and gliding types, but nappe typed as a whole. The formation of the structure was mainly subjected to the Indo-Chinese epoch SE, NW horizontal shearing-compressive stresses, and contemporary impacted from hard-soft- hard strata structure, air-cushion effect from high gas pressure coal seam and buoyancy effect from groundwater.