矿山需高可靠性的安全监控及应急信息系统,本文依据光纤光栅测量原理,结合顶板离层、锚杆应力、围岩应力3种光纤光栅传感器,研究了一种基于光纤光栅测量原理的矿用顶板无源光纤智能远程监测系统,达到了传感器本身不带电、安全且能满足...矿山需高可靠性的安全监控及应急信息系统,本文依据光纤光栅测量原理,结合顶板离层、锚杆应力、围岩应力3种光纤光栅传感器,研究了一种基于光纤光栅测量原理的矿用顶板无源光纤智能远程监测系统,达到了传感器本身不带电、安全且能满足煤矿监测现场就地显示的标准要求。在华阳新景矿3109辅助进风巷进行了试验应用,结果表明,顶板离层、锚杆应力、围岩应力均随距工作面距离减小而增大,符合矿压显现规律,最大围岩应力23.3 MPa,最大锚杆受力81 k N,最大顶板离层40 mm,锚杆抑制顶板离层效果显著。展开更多
The deformation control of surrounding rock in gobside roadway with thick and hard roof poses a significant challenge to the safety and efficiency of coal mining.To address this issue,a novel approach combining direct...The deformation control of surrounding rock in gobside roadway with thick and hard roof poses a significant challenge to the safety and efficiency of coal mining.To address this issue,a novel approach combining directional and non-directional blasting techniques,known as combined blasting,was proposed.This study focuses on the experimental investigation of the proposed method in the 122108 working face in Caojiatan Coal Mine as the engineering background.The initial phase of the study involves physical model experiments to reveal the underlying mechanisms of combined blasting for protecting gob-side roadway with thick and hard roof.The results demonstrate that this approach effectively accelerates the collapse of thick and hard roofs,enhances the fragmentation and expansion coefficient of gangue,facilitates the filling of the goaf with gangue,and provides support to the overlying strata,thus reducing the subsidence of the overlying strata above the goaf.Additionally,the method involves cutting the main roof into shorter beams to decrease the stress and disrupt stress transmission pathways.Subsequent numerical simulations were conducted to corroborate the findings of the physical model experiments,thus validating the accuracy of the experimental results.Furthermore,field engineering experiments were performed,affirming the efficacy of the combined blasting method in mitigating the deformation of surrounding rock and achieving the desired protection of the gob-side roadway.展开更多
文摘矿山需高可靠性的安全监控及应急信息系统,本文依据光纤光栅测量原理,结合顶板离层、锚杆应力、围岩应力3种光纤光栅传感器,研究了一种基于光纤光栅测量原理的矿用顶板无源光纤智能远程监测系统,达到了传感器本身不带电、安全且能满足煤矿监测现场就地显示的标准要求。在华阳新景矿3109辅助进风巷进行了试验应用,结果表明,顶板离层、锚杆应力、围岩应力均随距工作面距离减小而增大,符合矿压显现规律,最大围岩应力23.3 MPa,最大锚杆受力81 k N,最大顶板离层40 mm,锚杆抑制顶板离层效果显著。
基金funding support from the National Natural Science Foundation of China(Grant Nos.52074298 and 52204164)Fundamental Research Funds for the Central Universities(Grant No.2022XJSB03).
文摘The deformation control of surrounding rock in gobside roadway with thick and hard roof poses a significant challenge to the safety and efficiency of coal mining.To address this issue,a novel approach combining directional and non-directional blasting techniques,known as combined blasting,was proposed.This study focuses on the experimental investigation of the proposed method in the 122108 working face in Caojiatan Coal Mine as the engineering background.The initial phase of the study involves physical model experiments to reveal the underlying mechanisms of combined blasting for protecting gob-side roadway with thick and hard roof.The results demonstrate that this approach effectively accelerates the collapse of thick and hard roofs,enhances the fragmentation and expansion coefficient of gangue,facilitates the filling of the goaf with gangue,and provides support to the overlying strata,thus reducing the subsidence of the overlying strata above the goaf.Additionally,the method involves cutting the main roof into shorter beams to decrease the stress and disrupt stress transmission pathways.Subsequent numerical simulations were conducted to corroborate the findings of the physical model experiments,thus validating the accuracy of the experimental results.Furthermore,field engineering experiments were performed,affirming the efficacy of the combined blasting method in mitigating the deformation of surrounding rock and achieving the desired protection of the gob-side roadway.
