摘要
针对深井软岩巷道穿厚煤层碎裂顶板区围岩控制技术难题,通过现场调查,分析工程破坏特点,结合钻孔窥视分析结果,得出巷道围岩变形失稳原因为破碎岩体降低了内层锚网的支护性能,未能与围岩形成统一承载体,围岩松动圈扩大及变形不均匀致使U型棚支护性能降低,支护阻力不足,围岩扩容膨胀,发生破坏。提出通过超前预注浆和组合金属骨架实现破碎围岩改性、围岩应力优化,形成稳定的承载结构,进而实现破碎岩体的二次承载,强化内层锚网支护效果,做到内锚有效、外架可靠。以此提出"超前预支护+内锚外架联合控顶+锁腿控帮+喷注补强+底板控水卸压"联合的组合控制技术,形成了锚固体与注浆围岩互相强化,强控顶、辅以控帮治底的联合支护体系;现场开展了工程实践,并取得了较好的支护效果。
Aiming at the problem of surrounding rock control in deep soft rock roadway crossing thick coal seam broken roof area,the characteristics of engineering failure are analyzed by field investigation. Combining with the borehole peeping results,the reason for the deformation and instability of surrounding rock is concluded that the broken rock reduces the supporting performance of inner anchor net,and fails to form a unified carrier with surrounding rock,the expansion of surrounding rock loose circle and uneven deformation lead to the decrease of supporting performance of U-shaped shed,and result in insufficient support resistance and the surrounding rock expands,finally the surrounding rock fails. In order to realize the secondary bearing capacity of the broken rock mass,a stable bearing structure is formed by modifying the broken surrounding rock and optimizing the stress of surrounding rock with pre-grouting and combination of metal framework. The supporting effect of inner anchor mesh is strengthened and the inner anchor is effective and the outer frame is reliable. Based on this,the combined control technology of“advance support+internal anchor and external frame combined control of roof+locking leg control of side wall+guniting and grouting reinforcement+ floor water control and pressure relief groove relief ”is proposed. The combined support system is formed,including anchored rock and grouting rock mutually reinforcing,strong control of the roof,supplemented by floor control. And in the preliminary field engineering practice,favorable supporting effect was achieved.
作者
肖殿才
蒋祥卿
罗勇
任波
鲁德超
唐义川
XIAO Dian-cai;JIANG Xiang-qing;LUO Yong;REN Bo;LU De-chao;TANG Yi-chuan(State Key Laboratory of Deep Coal Mining and Environmental Protection,Huaihe Mining(Group)Co.,Ltd.,Huainan 232001,China;National Engineering and Technology Academy for Coal Mining,Huainan 232001,China;Production and Technique Department in Qinghai Energy Development(Group)Co.,Ltd.,Xi’ning 810000,China;Pansan Mine of Huaihe Energy Coal Industry Branch,Huainan 232096,China)
出处
《煤炭工程》
北大核心
2022年第2期37-42,共6页
Coal Engineering
基金
安徽省自然科学基金资助(2108085ME155,2108085QE209)。
关键词
揭穿煤层
破碎顶板
超前支护
注浆加固
联合支护
coal seam uncovering
broken roof
advance support
grouting reinforcement
combined support
