基于数值模拟的塔山煤矿近场顶板来压及控制规律研究1)

RESEARCH OF STEPPING PRESSURE AND CONTROL OF NEAR FIELD ROOF OF TASHAN COAL MINE BASED ON NUMERICAL SIMULATION1)

  • 摘要: 煤层坚硬顶板采用水力压裂技术进行定向弱化可有效控制来压步距,降低事故风险。基于黏聚力模型,利用有限元二次开发建立了压裂前后煤层开采数值计算模型,模拟分析了顶板垮落规律及影响因素,优化裂缝间距设计。结果表明:来压跨距与顶板厚度、强度呈正相关性,与埋深呈负相关性。预制裂缝在拉应力集中区可促进起裂扩展,应全面勘测各岩层位地质参数,利用计算出的应力集中区位置设计裂缝间距,实现经济有效地控制来压步距。

     

    Abstract: The hard roof of coal seam is directionally weakened by hydraulic fracturing technology, which can effectively control the stepping pressure distance and reduce the risk of accidents. Based on the cohesion model and the secondary development technology of the finite element platform, a numerical calculation model of coal seam mining before and after fracturing is established, the roof collapse law and its influencing factors are analyzed, and the fracture spacing design is optimized. The results show that the stepping pressure span has a positive correlation with the roof thickness and strength, and a negative correlation with the buried depth. Prefabricated fractures in tensile stress concentration areas can promote the crack initiation and propagation. Geological parameters of each rock layer should be carefully determined, as well as the location of stress concentration areas, to design the fracture spacing for controlling the stepping distance economically and effectively.

     

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