Mao Jianxin, Fan Yibo, Fan Gangwei, Zhang Jianying, Wu Ziquan, Shan Lilu, Ren Shang, Wang Hongfu, Yang Chao, Wang Yulong
State Investment Hami Energy Development Co., Ltd, Hami, 839000, China.
School of Mines, China University of Mining and Technology, Xuzhou, 221116, China.
Sci Rep. 2025 Aug 1;15(1):28170. doi: 10.1038/s41598-025-12343-6.
In western mining areas, roadways excavated in weakly cemented thick coal seams often experience significant deformation and support failure due to poor roof conditions, low cementation strength, and stress redistribution. Taking the 11,703 transportation roadway of the Dananhu No. 7 Coal Mine in Xinjiang as a case study, this paper investigates the deformation mechanisms of the surrounding rock and proposes an optimized support technology. Using numerical simulations, theoretical analysis, and field monitoring, the study reveals that roof failure evolves through stress redistribution, plastic softening, interlayer separation, and fragmentation, ultimately forming a 3.5 m plastic failure zone. The existing support system fails to establish effective deep-shallow coordination, with shallow bolts yielding and deep cables underutilized. To address this, a Graded Anchor Composite Support Technology is proposed, consisting of surface concrete, shallow high pre-tensioned bolts, mid-depth short cables, and deep long cables. The optimized design enhances support performance and restricts plastic zone expansion. Field application and simulation results show a 73.3% reduction in roof subsidence and a 40% decrease in plastic zone depth. The study provides engineering guidance for roadway support in similar geological conditions.
在西部矿区，在弱胶结厚煤层中开挖的巷道，由于顶板条件差、胶结强度低和应力重新分布，常常会经历显著的变形和支护失效。以新疆大南湖七号煤矿11703运输巷为例，本文研究了围岩的变形机制，并提出了优化的支护技术。通过数值模拟、理论分析和现场监测，研究发现顶板破坏通过应力重新分布、塑性软化、层间分离和破碎发展，最终形成一个3.5米的塑性破坏区。现有的支护系统未能建立有效的深浅部协调，浅部锚杆屈服而深部锚索未得到充分利用。为解决这一问题，提出了一种分级锚固复合支护技术，包括表面混凝土、浅部高预应力锚杆、中部短锚索和深部长锚索。优化设计提高了支护性能，限制了塑性区的扩展。现场应用和模拟结果表明，顶板下沉减少了73.3%，塑性区深度减少了40%。该研究为类似地质条件下的巷道支护提供了工程指导。
