急斜煤层分段放顶煤开采合理段高选择研究  

Selection of Reasonable Section Heights During Top-coal Caving to Steep Seams

作　　者：邵小平[1] 张红祥[2] 石平五[1] 

机构地区：[1]西安科技大学能源学院,陕西西安710054 [2]西安文理学院计算机科学系,陕西西安710065

出　　处：《中国矿业大学学报》2009年第4期544-548,共5页Journal of China University of Mining & Technology

基　　金：国家自然科学基金项目(50274058);高等学校博士点专项基金项目(20040704002)

摘　　要：为确定急斜煤层水平分段综放开采条件下工作面段高的合理取值，将开采后裸露顶板岩层简化为三边固支的矩形薄板，采用薄板破断理论对受横向和纵向载荷作用下的斜置矩形薄岩板进行力学分析．研究表明：岩板走向长度、倾斜长度、岩层倾角、覆岩栽荷及泊松比是影响段高取值的5个主要因素．应以在工作面上方采空区煤矸体沿着顶煤采出后形成的槽形采空区域下移前岩板不发生沿根部折断为极限段高的选择标准．工作面合理段高取值分为3奘：第Ⅰ类煤层倾角45°～55°，取值在29m范围内；第Ⅱ类55°～75°，取值在51m范围内；第Ⅲ类75°～90°，该范围内开采工艺及设备选择对合理段高取值的影响更为重要．Estimation of reasonable face-section heights during horizontal top-coal caving to steep seams was studied. Bare roof strata were modeled as simplified, trilateral, clamped, oblique, rectangular thin plates subject to lateral and longitudinal loads. The five main factors affecting section height are. the length of the strata plate; the length of the incline; the angle of the strata; the load from the overburden; and, the Poisson ratio of the rock. The standard for choosing the limit to the section height is that the strata plate don＇t break before coal and refuse in the gob area can move down the trough shaped gob after the overlying coal has been excavated. Reasonable section heights may be divided into three categories. First, for a seam inclination of 45° to 55°, about 29 meters. Second, for inclinations of 55° to 75° a height in the range of 51 meters. And, third, for inclinations from 75° to 90° the choice of mining technology and equipment is more important than the choice of section height. This study will help prevent the risk of large-scale roof collapse during production at the working face.

关 键 词：水平分段放顶煤 大段高 采放比 板破断 合理段高 

分 类 号：TD323[矿业工程—矿井建设]