平顶山矿区综采面顶板稳定性的沉积模式

本文讨论平顶山矿区综采工作面顶板的沉积特征、稳定性及二者关系。研究表明，煤层顶板的沉积环境控制综采工作面顶板的整体稳定性及其展布规律，构造条件等因素影响顶板稳定性的局部变化。在三角洲平原沉积构成的顶板中，分流河道砂岩是稳定性最好的顶板类型，属稳定顶板；厚层分流间湾泥岩顶板的稳定性次之，为中等稳定类型；越岸砂泥互层顶板和薄层分流间湾泥岩－分流河道砂岩顶板相对较差，前者属不稳定顶板，后者以不稳定至极不稳定为特征。在碎屑障壁海岸沉积构成的顶板中，厚层泻湖泥岩顶板相对较好，属中等稳定类型，泻湖泥岩－小型潮道砂体混合顶板的稳定性较差，以不稳定至极不稳定为特征。

DEPOSITIONAL MODEL OF ROOF STABILITY IN FULLY MECHANIZED COAL FACES IN PINGDINGSHAN MINE AREA

This paper discusses the depositional features and roof stability and the relationship between them.The investigation indicates that the depositional environment of roof controls the integral stability of roof and its rules of deployment in fully mechanized faces:and that the factors,such as tectonic condition,etc.affect the local change of roof stability.Among the roofs deposited in the delta plain,the most stable one is distributary channel sandstone sequence,which falls into the category of stable roof,the next stable one is thick interdistributary sequence,which falls into the category of moderately stable roof;the less stable one is overbank sequence and thin interdistributary mudstone and distributary channel sandstone sequence,the former being unstable roof,and the latter varying from unstable to extremely unstable roof.Among the clastic back-barrier coastal sedimentary roofs,the thick lagoon sequence is relatively stable.It belongs to moderately stable roof.The lagoon mudstone-minor tidal channel sandstone sequences are unstable to extremely unstable roof.