摘要
针对采空侧巷道顶板弯曲下沉、煤柱帮挤压鼓出严重的控制难题,采用有限元数值模拟软件分析了工作面回采后侧向围岩塑性破坏特征,获得了不同煤柱宽度下巷道围岩应力演化规律、塑性破坏分布特征及位移规律,确定了合理的煤柱尺寸,揭示了采空侧巷道由于煤柱失稳导致对顶板承载力降低,诱发巷道大变形的破坏机制。研究得到10 m煤柱条件下中性面位置,并在此基础上提出高预应力锚索-钢棒协同控制技术。井下工业性试验表明,巷道初期支护强度及刚度得到大幅提升,无支护体破坏现象,巷道顶底板移近量与两帮移近量分别降低39.9%与53%,保证了巷道服务期间的稳定性。
Aiming at the serious control problems of roof bending subsidence and coal pillar extrusion in goaf side roadway, the plastic failure characteristics of lateral surrounding rock after working face mining were analyzed by finite element numerical simulation software. The stress evolution law, plastic failure distribution characteristics and displacement law of roadway surrounding rock under different coal pillar widths were obtained, and the reasonable coal pillar size was determined. The failure mechanism of large deformation of roadway induced by coal pillar instability in goaf side roadway was revealed. The neutral plane position under the condition of 10 m coal pillar was obtained, and on this basis, the collaborative control technology of high pre-stressed anchor cable and steel bar was proposed. The underground industrial test shows that the strength and stiffness of the initial support of the roadway are greatly improved, and there is no failure of the support body. The convergence of the roof and floor of the roadway and the convergence of the two sides are reduced by 39.9% and 53%respectively, which ensures the stability of the roadway during service.
作者
吴乐
何杰
WU Le;HE Jie(CCTEG Coal Mining Research Institute,Beijing 100013,China;Coal Mining and Designing Department,Tiandi Science and Technology Co.,Ltd.,Beijing 100013,China;Coal Mining and Designing Branch,China Coal Research Institute,Beijing 100013,China)
出处
《煤炭技术》
CAS
北大核心
2022年第6期17-21,共5页
Coal Technology
关键词
采空侧巷道
煤柱尺寸
高预应力
钢棒
数值模拟
gob side roadway
coal pillar size
high pretensioned stress
steel bar
numerical simulation
