摘要
煤矿冲击地压的工程治理主要集中体现在冲击地压启动前的"防"与冲击启动后的"止",而如何依据冲击类型及能量特征设计吸能支护参数,有效地"止冲"对削弱冲击破坏程度具有重要意义。为实现冲击地压巷道吸能支护参数的量化设计,通过分析不同类型冲击地压释放的能量主体与破坏特征,指出了冲击危险巷道三级吸能支护方式的选择原则;基于能量守恒原理,考虑冲击释放能级、围岩破坏特征以及支护装备力学特性,给出了三级吸能支护参数的确定方法。研究结果表明:煤体压缩型冲击地压释能主体为煤体,释放能量一般不大于10~6J;顶板断裂型冲击地压释能主体为顶底板围岩,坚硬顶板断裂时释放能量不低于10~6J;断层错动型冲击地压释能主体为断层,释放能量在10~7J以上。不同类型冲击地压发生后,巷道围岩表现出不同程度的震动破坏,吸能支护设计应遵循原则:冲击能量分级设防、锚杆锚索主动支护优先、全断面主-被动联合支护、巷道支护结构整体稳定性与经济性。进行防冲支护参数设计时应采用逐次递进法设计吸能锚索、吸能U/O型棚、吸能液压支架的支护参数,当吸能锚索支护间距小于0.8 m时,升级为二级吸能计算,当吸能U/O型棚的排距小于0.6 m时,升级为三级吸能计算。现场实践表明:基于能量法的巷道支护参数可靠,防冲效果显著。
The engineering treatment of rockburst in coal mines mainly reflects in the two aspects of“prevention”before the bursting startup and"stop"after the rockburst initiation.Furtherly,involving the rockburst type and energy characteristics for parameters design of the energy absorbing support is important to effectively stop bursting and weaken the bursting damage degree.For quantitative design of energy absorbing support parameters in rockburst roadways,the main energy releasing bodies and failure characteristics of different type rockburst were analyzed and selection principles of three-level energy absorbing support in burst-prone roadway were proposed.Based on the energy conservation,the determination method of three-level energy absorbing support parameters was given,considering the energy level of rock⁃burst release,the failure characteristics of surrounding rock and the mechanical characteristics of support equipment.The results show that,the main energy-releasing body of coal compression type rockburst is coal mass,and its released energy is not more than 106 J;the main energy-releasing body of roof fracture type rockburst is roof and floor,and its released energy is no less than 106 J;the main energy-releasing body of fault dislocation type rockburst is fault structure,and the released energy is more than 107 J.After the occurrence of different types of rock burst,the surrounding rock of roadway shows different degrees of vibration damage.Therefore,some principles should be fol⁃lowed in design of energy absorbing support,involving rockburst energy classification prevention,active support priority of bolt and cables,active-passive combined and overall-section support,overall stability of roadway support structure and economic applicability.Hierarchical progressive method should be used to quantitatively determine the burst-resistance support parameters,successively including the support parameters of energy absorbing anchor cable,U/O-shed and hydraulic support.When the support spacing of energy absorbing anchor cable is less than 0.8 m,design degree is upgraded to two-level energy absorbing calculation;when the row spacing of energy absorbing U/Oshed is less than 0.6 m,corresponding degree is upgraded to three-level.The field practice shows that the parameter design method of three-level energy absorbing support based is reliable and the effect of burst-resistance of roadway is remarkable.
作者
王爱文
范德威
潘一山
代连朋
肖永惠
徐连满
陈建强
WANG Aiwen;FAN Dewei;PAN Yishan;DAI Lianpeng;XIAO Yonghui;XU Lianman;CHEN Jianqiang(School of Mechanics and Engineering,Liaoning Technical University,Fuxin 123000,China;Research Institute of Rockburst,Liaoning Technical University,Fuxin 123000,China;Institute of Physics,Liaoning University,Shenyang 110031,China;Key Laboratory of Ministry of Education on Safe Mining of Deep Metal Mines,Northeastern University,Shenyang 110819,China;Shenhua Xinjiang Energy Co.,Ltd.,Urumqi 830027,China)
出处
《煤炭科学技术》
CAS
CSCD
北大核心
2021年第6期72-81,共10页
Coal Science and Technology
基金
国家重点研发计划资助项目(2017YFC0804205)
国家自然科学基金面上资助项目(51974150)
新疆维吾尔自治区高层次人才引进工程(柔性人才)支撑资助项目(新人社函[2019]39号)。
关键词
冲击地压
冲击类型
释能主体
三级吸能支护
能量计算
rock burst
rock burst types
energy-releasing body
three-level energy absorption support
energy calculation
