刘桥一矿深井软岩下山巷道围岩控制技术
Surrounding Rock Control Technology of Deep Soft Rock Down-dip Gateway in Liuqiao No.1 Coal Mine
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摘要: 随着煤矿开采深度的逐渐增加，深井软岩巷道的围岩稳定控制问题已成为制约煤矿向深部发展的重大难题。为了研究深井软岩巷道的围岩控制理论和支护方法，以刘桥一矿-810 m水平Ⅱ66轨道下山为支护工程实践。采用工程地质调查、实验室试验和数值仿真等手段，系统分析了深井复杂工程地质条件下软岩下山巷道围岩变形破坏特征及失稳机理，提出了锚-网-索-注多层次组合控制方案。该方案尤其注重对巷道肩窝和帮角进行结构补强，同时对围岩变形破坏严重一侧进行加密支护。工业试验表明，采用该方案后，巷道围岩变形得到了有效控制。Abstract: With the gradual increase of mining depth, the surrounding rock stability of deep soft rock tunnel excavation control problem has become a major problem restricting the development of coal mining in deep well. In order to research the surrounding rock control theory of deep soft rock roadway and supporting technology, taking II66 down-dip gateway in -810 m level of No.1 Liuqiao Mine as supporting engineering practice. By engineering geological investigation, laboratory test and numerical simulation methods, we analyze the deformation and instability mechanism of deep soft rock roadway surrounding rock down the hill under complicated condition, and the anchor- net- cable-grouting multilevel combination control scheme is proposed. The scheme, in particular, focuses on the reinforcement and strengthening of the roadway deformation and failure, specially supports the serious deformation and failure side of the surrounding rock. The field industrial test shows that the surrounding rock deformation is effectively controlled by the proposed method.
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Keywords:
- deep well /
- soft rock /
- ground stress /
- asymmetrical deformation /
- combined control
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