陈四楼矿综采工作面采场应力监测及演化规律研究

Research on monitoring technique and evolution law of the disturbance stress in Chensilou Colliery

简述了目前煤矿井下采场应力监测现状,分析了钻孔应力解除法存在的问题。采用空心包体应力测量技术,在原岩地应力实测基础上监测采动应力的演化过程,探究采动应力影响下工作面覆岩及巷道围岩应力的动态变化规律。测量结果表明:实测原岩地应力的最大主应力以铅垂应力为主,在采动过程中随着超前支承应力峰值区距离测点越来越近,最大主应力方向与水平面夹角逐渐减小,接近应力降低区时又逐渐增加;随着工作面推进,采动应力值不断增大,距测点136 m达最大值,约为原岩应力的3.29倍,而后进入应力稳定区。原岩应力测量和采动应力监测为2者相互作用关系研究提供了理论基础,对回采巷道围岩稳定控制具有重要指导意义。

This paper outlines the current status of crustal stress measurement,and analyzes the existing problems ofhollow inclusion strain stress relief method. Using the hollow inclusion strain cells measurement technique,the evolu-tion of mining dynamic pressure is monitored based on original rock stress measurements. The results show that the di-rection of maximum principal stress is mainly in vertical stress,its peak area changes from initial near-vertical directionto nearly horizontal direction,and then fades to near vertical when closing to the stress-reducing region. The disturb-ance stress increases with the working face advances,and reaches the maximum value at 136 m away from measuringpoint which is 3. 29 times of the original rock stress,and then it stabilizes. The measurement of original rock stress anddisturbance stress provides a theoretical basis for the study of their interaction,and has a guiding significance to the re-search of roadway stability control.