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深部采动巷道冲击地压力构协同防控机理及工程实践

Technology and application of force-structure cooperative prevention and control on rockburst for mining roadway in deep

  • 摘要: 针对西北地区深部多厚硬顶板采动巷道冲击地压日益严重的问题,基于鄂尔多斯2个典型深部矿区下属6对冲击地压矿井的含煤地层结构、现场冲击显现特征,建立了深部多厚硬顶板采动巷道冲击地压工程力学分析模型,得出了具有承载上覆岩层重量和传递岩层应力双重作用的“倒直梯形区”和具有控制倒直梯形区扩展和保护区段煤柱双重作用的“倾斜块体”是影响采动巷道围岩应力分布及结构稳定的核心,提出了以“吸能稳构、断联增耗、转移释放、让压阻抗”为核心的深部多厚硬顶板采动巷道冲击地压力构协同防控原理,明确了巷道顶板结构优化和围岩应力控制的防冲技术措施,通过典型冲击地压工作面现场防冲实际,验证了采动巷道冲击地压力构协同防控技术的有效性,为西北地区深部厚硬顶板条件下采动巷道冲击地压防治提供理论指导。

     

    Abstract: Aiming at the increasingly severe rockburst hazards in mining roadways under deep conditions with multiple thick-hard roofs in northwestern China, this study established an engineering mechanical analysis model for rockburst in such roadways, based on analyses of coal-bearing stratigraphic structures and in-situ rockburst characteristics of six rockburst-prone mines affiliated with two typical deep mining areas in Ordos. This study reveals that the inverted right trapezoid zone, which bears the weight of overlying strata and transfers stratal stress, and the inclined block, which restricts the expansion of the inverted right trapezoid zone and protects section coal pillars, are the core factors affecting the surrounding rock stress distribution and structural stability of mining roadways. Centered on the core concepts of energy absorption and structure stabilization, decoupling and energy dissipation enhancement, stress transfer and release, and yielding support and resistance, we proposed a force-structure cooperative prevention and control principle for rockburst in deep mining roadways with multiple thick-hard roofs. Furthermore, we clarified the targeted rockburst prevention technical measures, including roadway roof structure optimization and surrounding rock stress control. Field practices at typical rockburst-prone working faces verified the effectiveness of the proposed force-structure cooperative prevention and control technology, providing theoretical guidance for rockburst prevention and control in mining roadways under deep thick-hard roof conditions in northwestern China.

     

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