摘要
为研究外旋射流成孔过程及破煤后煤渣粒径分布,根据最大拉应变理论和最大切应力理论,分析煤在剪应力和拉应力作用下的破坏准则。基于强度3.65 MPa,弹性模量185 MPa,尺寸1 m×0.8 m×0.8 m的煤相似材料,进行不同泵压下的外旋射流破煤实验;收集煤破坏后的渣体,进行粒径分析实验。结果表明:外旋射流破煤钻进速度与成孔孔径随泵压的增大而增大;在成孔过程中,前向射流破煤成孔,后向射流提供钻进力,煤破坏主要以拉应力破坏和剪应力破坏为主。煤破坏后煤渣粒径分布区间为84~1061μm,泵压越大,破碎后的煤体粒度越小。
In order to study the pore-forming process of the rotary jet and the particle size distribution of the coal cinder after breaking coal.According to the theory of maximum tensile strain and the theory of maximum shear stress,the failure criterion of coal under shear stress and tensile stress is obtained.Based on the strength of 3.65 MPa,elastic modulus of 185 MPa,size of 1 m×0.8 m×0.8 m coal similar material,the coal breaking experiment under different pump pressures was carried out;the coal cinder from broken coal was collected and the particle size analysis experiment was carried out.The results show that the external drilling jet breaks the coal drilling speed and the pore diameter increases with the increase of the pump pressure.In the poreforming process,the forward jet breaks the coal,the backward jet reams,and the failure of coal is mainly caused by tensile stress and shear stress.The coal cinder particle size distribution is from 84μm to 1061μm.The larger the pump pressure,the smaller the particle size of the coal cinder.
作者
刘正杰
王克全
刘延保
申凯
何立鹏
高华礼
LIU Zhengjie;WANG Kequan;LIU Yanbao;SHEN Kai;HE Lipeng;GAO Huali(China Coal Research Institute,Beijing 100013,China;State Key Laboratory of Gas Detecting,Preventing and Emergency Controlling,Chongqing 400037,China;China Coal Technology&Engineering Group Chongqing Research Institute,Chongqing 400037,China)
出处
《煤矿安全》
CAS
北大核心
2019年第12期28-31,共4页
Safety in Coal Mines
基金
中煤科工集团重庆研究院自立创新引导重点资助项目（2018ZDXM05）
中煤科工集团重庆研究院科技创新创业资金专项资助项目（2018QN005）
重庆市技术创新与应用示范资助项目（cstc2018jscs-msybX0067）
关键词
外旋射流
相似材料
破煤实验
成孔原理
粒径分析
rotary jet
similar material
coal breaking experiment
hole forming principle
particle size analysis
