龙滩矿采动巷道非对称破坏特征与控制方法

Asymmetric failure characteristics and control methods of mining roadway in Longtan Mine

针对采动巷道受采动影响剧烈、顶板非对称变形、冒顶隐患程度大等问题,以龙滩煤矿3111N工作面采动巷道为工程背景,综合数值模拟、理论分析、现场监测等方法,获取了采动影响下围岩塑性区演变和分布特征,揭示了采动巷道顶板塑性区分布特征与冒顶的内在联系。结果表明,随着工作面的推移,采动巷道围岩主应力比值逐渐增大,主应力方向发生偏移,造成围岩塑性区最大破坏深度集中在顶板采煤帮侧,此时巷道冒顶隐患最大。据此,提出了基于巷道围岩塑性区分布特征的非对称支护参数设计,旨在通过重点加固顶板破坏严重区域内岩体来改善围岩应力环境,从而抑制巷道围岩塑性区恶性扩展,达到控制巷道围岩变形的目的。

Aiming at the problems of mining roadway affected by mining,asymmetric deformation of roof and hidden danger of roof fall,the mining roadway of No.3111N Face in Longtan Mine was taken as the engineering background,the evolution and distribution characteristics of plastic zone of surrounding rock under the mining influence of were obtained by means of numerical simulation,theoretical analysis and field monitoring,and the internal relationship between the distribution characteristics of plastic zone of roof and roof fall was revealed.The results showed that with the mining of the working face,the principal stress ratio of the surrounding rock of the mining roadway gradually increased,and the principal stress direction shifted,resulting in the maximum damage depth of the plastic zone of the surrounding rock concentrated on the side of the roof coal mining,and the hidden danger of roof fall was the largest.Based on this,an asymmetric support parameter design based on the distribution characteristics of the plastic zone of the surrounding rock of the roadway was proposed.The purpose was to improve the stress environment of the surrounding rock by focusing on the reinforcement of the rock mass in the area where the roof was seriously damaged,thereby inhibiting the malignant expansion of the plastic zone of the surrounding rock of the roadway,and thus achieving the purpose of controlling the deformation of the surrounding rock of the roadway.