大断面开切眼中导硐超前开挖一次成巷技术  

Simultaneous Drifting Gateway Technology of Medium Guide Hole Advanced Excavation for Large Cross Section Open-Off Cut

作　　者：刘伟[1] 惠兴田[1] 马金龙[1] 

机构地区：[1]西安科技大学建筑与土木工程学院,陕西西安710054

出　　处：《煤炭科学技术》2012年第9期16-19,共4页Coal Science and Technology

摘　　要：为解决大断面开切眼在开挖过程中的顶板下沉量大及底鼓严重问题,提出了一种适合大断面开切眼掘进的中导硐超前开挖一次成巷技术,采用Midas/GTS数值模拟研究了在中导硐超前开挖一次成巷与断面分区二次成巷2种开挖施工方式下,开切眼围岩变形特点及应力分布特征。研究结果表明:采用中导硐超前开挖技术,顶板下沉量减少43 mm、底鼓量减少110 mm,围岩塑性区较小,且巷道围岩受力也均匀,更有利于围岩稳定。在新窑矿4502开切眼采用此种开挖技术,矿压监测结果显示顶板下沉量为98 mm、底鼓量为172 mm,围岩变形在控制范围内,能维持巷道稳定。In order to solve the high roof subsidence and serious floor heave problems occurred in the excavation process of the large cross section open-off cut, the simultaneous drifting gateway technology of medium guide hole advanced excavation for the large cross section open-off cut was proposed. A Midas/GTS numerical simulation was applied to study the surrounding rock deformation features and the stress distribution features of the open-off cut under the condition of simultaneous drifting gateway technology of medium guide hole ad- vanced excavation and the secondary drifting gateway with the cross section slicing. The study results showed that with the simultaneous drifting gateway technology of medium guide hole advanced excavation, the roof subsidence value was reduced by 43 mm, the floor heave value was reduced by 110 mm, the plasticity zone of the surrounding rock was small, the gateway stress were even and would be favorable to the stability of the surrounding rock. The simultaneous drifting gateway technology of medium guide hole advanced excavation was ap- plied to the construction of the open-off cut for No. 4502 coal mining face in Xinyao Mine. The monitoring and measuring results of the mine strata pressure showed that the roof subsidence value was 98 mm, the floor heave value was 172 mm, the surrounding rock deforma-tion were within the control range and the stability of the gateway could be maintained.

关 键 词：大断面开切眼 超前开挖 一次成巷 数值模拟 

分 类 号：TD353[矿业工程—矿井建设]