The occurrence of overlying coal pillar(OCP)exerts a strong effect on the stress and strain distribution of the surrounding rock in the stope.In this paper,the stress distribution characteristics are analyzed via the ...The occurrence of overlying coal pillar(OCP)exerts a strong effect on the stress and strain distribution of the surrounding rock in the stope.In this paper,the stress distribution characteristics are analyzed via the numerical calculation with the account of OCP presence or absence.In addition,this study revealed the joint effect of side pressure relief area of the goaf and stress concentration in OCP on the final stress distribution.Furthermore,the rules of abutment stress distribution affected by three influencing factors,namely horizontal-vertical distances between OCP and working face and buried depth of OCP,are analyzed.The functional model linking the peak stress of surrounding rock with the above influencing factors is developed.The field application of the above results proved that the rib spalling and deformation of a 2.95 m-high and 5.66 m-wide roadway could be efficiently controlled by rationally adjusting working states of the support,and adopting the hydraulic prop coordinated with the p type metal beam and anchor cable to strengthen the surrounding rock of working face and roadway,respectively.The proposed measures are considered appropriate to satisfy the safe operation requirements.展开更多
通过对三向应力状态下的煤柱极限强度影响因素分析得出:我国目前普遍应用的A H 威尔逊计算理论存在因简化带来的问题.给出了不受地质采矿条件约束的计算公式,从而弥补了A H 威尔逊煤柱设计理论应用的局限性.实验得出:宽厚条带煤柱屈服...通过对三向应力状态下的煤柱极限强度影响因素分析得出:我国目前普遍应用的A H 威尔逊计算理论存在因简化带来的问题.给出了不受地质采矿条件约束的计算公式,从而弥补了A H 威尔逊煤柱设计理论应用的局限性.实验得出:宽厚条带煤柱屈服区宽度达到煤柱宽度的22 5%～27 5%,最大侧向应力系数λ=0 4～0 8.展开更多
基金supported by the Special Funding Projects of Sanjin Scholars” Supporting Plan (No. 2050205)the National Key Research Projects (No. 2016YFC0600701)Ordinary University Graduate Student Scientific Research Innovation Projects of Jiangsu Province of China (No. KYLX16_0564)
文摘The occurrence of overlying coal pillar(OCP)exerts a strong effect on the stress and strain distribution of the surrounding rock in the stope.In this paper,the stress distribution characteristics are analyzed via the numerical calculation with the account of OCP presence or absence.In addition,this study revealed the joint effect of side pressure relief area of the goaf and stress concentration in OCP on the final stress distribution.Furthermore,the rules of abutment stress distribution affected by three influencing factors,namely horizontal-vertical distances between OCP and working face and buried depth of OCP,are analyzed.The functional model linking the peak stress of surrounding rock with the above influencing factors is developed.The field application of the above results proved that the rib spalling and deformation of a 2.95 m-high and 5.66 m-wide roadway could be efficiently controlled by rationally adjusting working states of the support,and adopting the hydraulic prop coordinated with the p type metal beam and anchor cable to strengthen the surrounding rock of working face and roadway,respectively.The proposed measures are considered appropriate to satisfy the safe operation requirements.
文摘通过对三向应力状态下的煤柱极限强度影响因素分析得出:我国目前普遍应用的A H 威尔逊计算理论存在因简化带来的问题.给出了不受地质采矿条件约束的计算公式,从而弥补了A H 威尔逊煤柱设计理论应用的局限性.实验得出:宽厚条带煤柱屈服区宽度达到煤柱宽度的22 5%～27 5%,最大侧向应力系数λ=0 4～0 8.
