坚硬厚顶板条件下岩层破断及工作面矿压显现特征分析  

Analysis on the rock failure and strata behavior characteristics under the condition of hard and thick roof

作　　者：杨敬轩[1] 鲁岩[1] 刘长友[1] 杨宇[1] 

机构地区：[1]中国矿业大学矿业工程学院,煤炭资源与安全开采国家重点实验室,江苏徐州221116

出　　处：《采矿与安全工程学报》2013年第2期211-217,共7页Journal of Mining & Safety Engineering

基　　金：江苏省研究生培养创新工程项目(CXLX12_0964);中央高校基本科研业务费专项资金项目(2010QNA32,2012DXS02)

摘　　要：以石屹台煤矿生产实际为背景,采用理论分析与现场实测相结合的研究方法,对不同支撑边界条件下坚硬厚顶板破断及来压特征进行了分析。研究得到顶板破断位置及尺寸的确定方法及步骤:1)根据顶板不同支撑边界求得岩层应力分量表达式;2)根据深梁、长梁结构应力分布特点,结合长梁易破断位置应力,给出顶板危险垮断尺寸;3)修正顶板危险垮断尺寸得到坚硬厚顶板岩层内最大主应力及剪应力分布;4)选定最大拉应力或剪应力值接近岩石抗拉或抗剪强度时的垮断尺寸作为顶板极限安全跨距。结果表明:石屹台煤矿坚硬厚顶板以剪断特征为主,顶板初次垮断及周期来压步距分别在35.0 m与9.8 m左右。Theoretical analysis and field measurement were adopted to analyze the hard and thick roof breaking characteristics under the different support boundary conditions in Shigetai coal mine.Steps of determining the roof broken location and size include： 1） the rock stress expressions was solved according to the different roof support boundary;2） determining the broken and dangerous size according to the characteristics of the stress distribution between the general long and deep beam structure;3） adjusting the broken and dangerous size and obtaining the distribution of the maximum principal stress and shear stress in the hard and thick roof strata;4） selecting and determining the safe limit size of the hard roof when the maximum tensile stress or shear stress values close to the limited strength.Results show that the hard roof mainly presented shearing characteristics in Shigetai coal mine,and the first and periodic weighting length equals 35.0 m and 9.8 m respectively.

关 键 词：坚硬厚顶板 安全跨距 破断位置 周期来压 

分 类 号：TD31[矿业工程—矿井建设]