煤矿深部岩石力学性能试验分析与硬岩巷道快速掘进方法研究  

STUDY OF ROCK MECHANICAL PROPERTIES AND RAPID EXCAVATION METHOD FOR HARD ROCK ROADWAYS IN DEEP COAL MINE

作　　者：袁文华[1] 马芹永[1,2] 

机构地区：[1]安徽理工大学土木建筑学院,安徽淮南232001 [2]安徽理工大学矿山地下工程教育部工程研究中心,安徽淮南232001

出　　处：《岩石力学与工程学报》2010年第A01期2853-2857,共5页Chinese Journal of Rock Mechanics and Engineering

基　　金：住房和城乡建设部研究开发项目(2009-k4-5)

摘　　要：在RMT-150B岩石力学试验机上进行深部巷道砂岩单轴压缩和不同围压下三轴压缩试验,测得砂岩的力学性质参数。根据岩石应力-应变曲线分析深部岩石的强度和变形特性,岩石抗压强度随围压的增加而提高,围压从10MPa增加到15MPa时,抗压强度增幅达到40.3%。深部高应力下,砂岩承载后产生的变形及破坏形态与围压大小密切相关,其主应力差-应变曲线斜率随着围压的增加而明显变陡,破坏荷载增高。依据岩石力学特性,采用分类布孔,掏槽眼宜用直径φ42mm的钻头钻眼,其余的炮眼用直径φ32mm的钻头钻眼,缩短钻眼时间。掏槽眼采用中深孔不同阶微差斜眼掏槽方法,炮眼深度宜采用2.2～2.5m,有利于巷道的进尺;周边眼采用小直径药卷光面爆破技术,有利于巷道成形。Experiments are carried out to study the hard sandstone under uniaxial compression and different confining pressures with triaxial compression by the rock mechanics testing machine RMT - 150B in deep coal mine, and basic mechanical properties of sandstone are measured. According to the rock stress-strain curves, strength properties and deformation characteristics of deep-seated rock are analyzed. The results show that rock compression strength increases by 40.3% with confining pressure from 10 to 15 MPa. The deformation and failure pattern of sandstone are closely related to confining pressure. The slope of main stress difference-strain curves are steep significantly with the increasing of the confining pressure. Based on the mechanical properties of rock, the 42 mm in diameter drill bit is adopted for the cutting holes and the 32 mm in diameter drill bit is used for the surrounding holes in order to save the drilling time. The different steps of millisecond inclined cutting with medium-length hole are proposed, and the depths of 2.2- 2.5 m for blasting hole are reasonable which are beneficial to the footage. The surrounding hole with small diameter is beneficial to the roadway forming.

关 键 词：岩石力学 掏槽方式 炮眼参数 硬岩巷道 煤矿 

分 类 号：TU45[建筑科学—岩土工程]