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Failure analysis and control measures of deep roadway with composite roof: a case study
International Journal of Coal Science & Technology Pub Date : 2022-02-20 , DOI: 10.1007/s40789-022-00469-1
Yongliang Li 1 , Shaojie Lu 1 , Renshu Yang 2 , Shizheng Fang 2 , Hai Lin 2 , Ye Zhu 3 , Maosheng Wang 3
Affiliation  

There is great variation in the lithology and lamination thickness of composite roof in coal-measure strata; thus, the roof is prone to delamination and falling, and it is difficult to control the surrounding rock when developing roadway in such rock strata. In deep mining, the stress environment of surrounding rock is complex, and the mechanical response of the rock mass is different from that of the shallow rock mass. For composite-roof roadway excavated in deep rock mass, the key to safe and efficient production of the mine is ensuring the stability of the roadway. The present paper obtains typical failure characteristics and deformation and failure mechanisms of composite-roof roadway with a buried depth of 650 m at Zhaozhuang Coal Mine (Shanxi Province, China). On the basis of determining a reasonable cross-section shape of the roadway and according to the failure characteristics of the composite roof in different regions, the roof is divided into an unstable layer, metastable layer, and stable layer. The controlled unstable layer and metastable layer are regarded as a small structure while the stable layer is regarded as a large structure. A superimposed coupling support technology of large and small structures with a multi-level prestressed bearing arch formed by strong rebar bolts and highly prestressed cable bolts is put forward. The support technology provides good application results in the field. The study thus provides theoretical support and technical guidance for ground control under similar geological conditions.



中文翻译:

复合顶板深巷道失效分析及控制措施:以案例研究

煤系地层复合顶板的岩性和叠层厚度变化较大;因此,顶板容易脱层、塌陷,在此类岩层中开挖巷道时围岩难以控制。在深部开采中,围岩受力环境复杂,岩体的力学响应与浅部岩体不同。对于深部岩体开挖的复合顶板巷道,保证巷道的稳定性是矿山安全高效生产的关键。获得了山西省赵庄煤矿埋深650 m的复合顶板巷道典型破坏特征及变形破坏机制。在确定合理的巷道断面形状的基础上,根据复合顶板在不同区域的破坏特征,将顶板分为不稳定层、亚稳定层和稳定层。受控不稳定层和亚稳层被认为是一个小结构,而稳定层被认为是一个大结构。提出了一种由强钢筋螺栓和高预应力索螺栓组成的多级预应力承重拱的大小结构叠加耦合支护技术。该支撑技术在该领域提供了良好的应用效果。该研究为类似地质条件下的地面控制提供了理论支持和技术指导。屋顶分为不稳定层、亚稳定层和稳定层。受控不稳定层和亚稳层被认为是一个小结构,而稳定层被认为是一个大结构。提出了一种由强钢筋螺栓和高预应力索螺栓组成的多级预应力承重拱的大小结构叠加耦合支护技术。该支撑技术在该领域提供了良好的应用效果。该研究为类似地质条件下的地面控制提供了理论支持和技术指导。屋顶分为不稳定层、亚稳定层和稳定层。受控不稳定层和亚稳层被认为是一个小结构,而稳定层被认为是一个大结构。提出了一种由强钢筋螺栓和高预应力索螺栓组成的多级预应力承重拱的大小结构叠加耦合支护技术。该支撑技术在该领域提供了良好的应用效果。该研究为类似地质条件下的地面控制提供了理论支持和技术指导。提出了一种由强钢筋螺栓和高预应力索螺栓组成的多级预应力承重拱的大小结构叠加耦合支护技术。该支撑技术在该领域提供了良好的应用效果。该研究为类似地质条件下的地面控制提供了理论支持和技术指导。提出了一种由强钢筋螺栓和高预应力索螺栓组成的多级预应力承重拱的大小结构叠加耦合支护技术。该支撑技术在该领域提供了良好的应用效果。该研究为类似地质条件下的地面控制提供了理论支持和技术指导。

更新日期:2022-02-21
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