错层位综放接续工作面基本顶稳定性分析

Analysis on Stability of Main Roof of Fully-mechanized Continuous Working Face in Stagger Arrangement Roadway

通过理论分析发现,错层位接续工作面与首采工作面上覆岩层垮落后连成一整体,类似于一超长工作面开采,同时发现错层位接续工作面基本顶初次断裂前后处于不同应力状态,在此基础上,分别建立接续工作面不同时期基本顶的力学模型,对错层位工作面基本顶来压步距进行公式推导,发现错层位接续工作面初次来压和周期来压步距均小于首采工作面。通过相似模拟实验也发现错层位接续工作面基本顶断裂步距较小这一现象,在接续工作面开采过程中,上覆岩层支承压力峰值向接续工作面一侧转移,有利于接续工作面的开采,并通过现场实测进行了验证。

Through theoretical analysis, it is found that the stagger and continuous working faces are connected with the overlying strata collapsed from the first working face, which is similar to a super long working face mining; at the same time, it is found that the main roof of stagger and continuous working face is in the different stress state before and after the initial fracture. On this basis, the mechanical models of the main roof of the continuous working faces in the different periods were established and the formulas of the main roof breakage interval were deduced. It is found that the first weighting interval and periodic weighting interval of the continuous working face are less than those of the first working face. This phenomenon was also found in the similarity simulation experiment, otherwise, during the period of mining, the abutment pressure peak was transfered to the side of the continuous working face, and it is advantageous to the mining of continuous working face. The research results were verfied by the field test.