窄煤柱沿空掘巷迎头区贯通阶段矿压显现规律及防治技术研究

Study on the regulation of mine pressure and prevention technology in the gathering stage of the heading area of the narrow coal pillar along the open-pit tunnel

对于存在冲击地压危险的沿空掘巷工作面,由于其应力环境的复杂性,大大增加了巷道贯通阶段防冲工作的难度。基于如何避免掘进工作面迎头区冲击地压频发的问题,确保工作面安全科学贯通,以纳林河二号矿井31120沿空掘进工作面为工程背景,展开理论分析和实践探索。通过理论分析,对掘进工作面迎头区冲击地压的发生机理展开初步探讨;进一步采用地音监测的方法,分析了掘进贯通期间迎头滞后区域地音事件突增的范围,进而确定该范围为掘进贯通影响区域。为了消除冲击地压隐患,设计了掘进贯通期间的多轮循环大直径钻孔卸压措施,并通过现场实测数据分析得到卸压效果良好的结论。本文研究对于提高纳林河二号矿井31120沿空掘进工作面的安全性与稳定性具有重要意义,同时也为类似工程提供了有益的参考和借鉴。

For the working face with rock burst danger along the open-pit tunnel,due to the complexity of its stress environment,the difficulty of rock burst prevention in the tunneling stage is greatly increased.Based on how to avoid the frequent occurrence of rock burst in the head area of the tunneling working face and ensure the safe and scientific connection of the working face,the theoretical analysis and practical exploration are carried out with the 31120 along open-pit tunneling working face of Nalinhe No.2 Mine as the engineering background.Through theoretical analysis,the occurrence mechanism of rock burst in the heading area of the tunneling working face is preliminarily discussed.Furthermore,the method of acoustic emission is adopted to analyze the range of acoustic events suddenly increased in the head lag area during the tunneling connection,and then the range is determined as the influence area of the tunneling connection.In order to eliminate the risk of rock burst,the pressure relief measures of multi-round cyclic large diameter drilling during the tunneling connection are designed,and the conclusion of good pressure relief effect is obtained through the analysis of the field measured data.This paper has important significance for improving the safety and stability of the 31120 along open-pit tunneling working face of Nalinhe No.2 Mine,and also provides useful reference for similar projects.