孤岛工作面不同推进度对下伏大巷围岩稳定性影响研究

发布时间：2018-03-10 00:00

本文选题：孤岛煤体　切入点：推进速度　出处：《煤炭工程》2017年04期 　论文类型：期刊论文

【摘要】：为了掌握孤岛残留煤体回采工作面推进速度对下伏大巷稳定性的影响展开研究,首先通过室内实验发现,提高试件围压加、卸载速度可显著提高其极限承载能力,结合东欢坨矿井下实际进行分析,认为工作面推进速度加快可减小极限平衡区的范围,也即对下伏大巷高应力持续影响时间降低。随后,通过对不同开采速度影响下大巷围岩应力分布与塑性破坏情况进行计算机数值模拟实验研究,发现工作面循环进尺从1m增加至3m,应力值降低,但增加至4m以后,该应力值增加,也即循环进尺为3m、4m时对围岩承载较为有利;从大巷围岩塑性破坏方面分析,工作面循环进尺增加至3m,大巷围岩塑性破坏范围降低,随后破坏范围增加,从而确定孤岛煤体回采工作面循环进尺保持3m较为合理。
[Abstract]:In order to study the influence of advance speed on the stability of underground roadway in Gudao residual coal mining face, it is found that increasing the confining pressure and unloading speed can significantly improve the ultimate bearing capacity through laboratory experiments. Based on the analysis of the actual situation in Donghuantuo Mine, it is concluded that the range of limit equilibrium area can be reduced by accelerating the speed of working face advance, that is, the time of continuous influence on the high stress of underground roadway is reduced. Through numerical simulation of stress distribution and plastic failure of roadway surrounding rock under the influence of different mining speed, it is found that the stress value of the working face increases from 1 m to 3 m, and the stress value decreases, but after increasing to 4 m, the stress value increases. In other words, when the circulating ruler is 3 m ~ 4 m, it is more favorable for the bearing capacity of surrounding rock, and from the aspect of plastic failure of surrounding rock in roadway, the circulating ruler increases to 3 m, and the plastic failure range of surrounding rock of roadway decreases, and then the failure range increases. Therefore, it is reasonable to determine that the circulating ruler of Gudao coal stoping face keeps 3 m.
【作者单位】：中国矿业大学(北京);开滦(集团)有限责任公司;新疆工程学院;
【基金】：国家自然科学基金项目(51404270) 中央高校基本科研业务费专项资金项目(2011QZ06) 新疆维吾尔自治区高校科研计划项目(XJEDU2016S089)
【分类号】：TD323

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