首页|薄煤层N00工法巷道顶板控制机理及分区补偿支护技术

薄煤层N00工法巷道顶板控制机理及分区补偿支护技术

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薄煤层N00工法的提出，革新了传统的煤矿开采模式、关键技术与装备系统，并取得了成功应用。而新开采模式下的巷道围岩控制技术尚不完善，为实现薄煤层N00工法巷道顶板结构的安全稳定，考虑其工艺流程和顶板变形特点，将巷道划分为超前硐室、垮落成巷两个阶段。并基于Hoek-Brown非线性岩体强度破坏准则，确定了巷道顶板不同阶段的锚杆/索预紧力的计算公式，提出了巷道顶板锚杆/索预紧力及长度设计方法。此外，结合数值模拟研究了不同阶段巷道顶板锚杆/索支护作用机理及不同锚杆/索支护组合对围岩应力分布的影响，揭示了锚杆/索支护关键参数对顶板稳定性的影响机制。最后，综合理论与数值模拟分析结果，提出了分区补偿支护技术，确定了锚杆/索预紧力、长度及选材的设计原则，该技术在现场取得了良好的应用效果。
Roof control mechanism and partition compensation support technology of gob-side entry formed by N00 mining method in thin coal seam
To achieve scientific and accurate support for the roadway roof in the N00 mining method for thin coal seams,the roof-cutting self-forming roadway is divided into two stages:the advanced chamber stage(Stage I)and the roof collapse and roadway formation stage(Stage Ⅱ),considering its technological process and the characteristics of roof deformation.Using the Hoek-Brown nonlinearity rock mass strength failure criterion,we derive the formula for the required pre-tension force of anchor bolts/cables at different stages of the roof.Additionally,a design approach is proposed for determining the necessary pretension force and length of anchor bolts and cables.Moreover,the supporting mechanism of anchor bolts/cables and the impact of different supporting combinations on the stress distribution of the surrounding rock are obtained through numerical simulations,elucidating the influence of key parameters in the design of anchor bolts/cables on roof stability.Finally,the partition compensation support technology(PCST)is introduced,and the design principles for anchor bolts and cables on the roof are established.Furthermore,this innovative support technology is implemented at Xintai Coal Mine,yielding favorable results in field applications.

N00 mining methodgob-side entryupper bound methodroadway support designnumerical simulation

杨军、刘奔、王亚军、张俊、侯世林、王育坤、吴星、李宏财

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State Key Laboratory for Geomechanics&Deep Underground Engineering,China University of Mining&Technology,Beijing 100083,China

School of Civil and Resources Engineering,University of Science and Technology Beijing,Beijing 100083,China

Shenmu Ningtiaota Coal Mining Company Ltd.,Shaanxi Coal Mining Group,Yulin 719300,China

N00工法 沿空留巷 上限法 支护设计 数值模拟

国家自然科学基金国家自然科学基金北京市自然科学基金Liulin Energy and Environment Academician Workstation,ChinaScience and Technology Programs in Guizhou Province,China

520742985190420782320562022XDHZ12[2020]3008J

2024

10.1007/s11771-023-5533-z

中南大学学报(英文版)
中南大学

中南大学学报(英文版)

CSTPCDEI
影响因子：0.47
ISSN：2095-2899
年,卷(期)：2024.31(2)
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