近距离采空区下大倾角“三软”厚煤层综采片帮机理与控制

采矿与安全工程学报 ›› 2016, Vol. 33 ›› Issue (4): 611-617.

近距离采空区下大倾角“三软”厚煤层综采片帮机理与控制

安徽理工大学特殊开采研究所，煤矿安全高效开采省部共建教育部重点实验室，安徽淮南 232001

收稿日期:2015-10-20 出版日期:2016-07-15 发布日期:2016-07-25
作者简介:杨科(1979—)，男，四川省泸州市人，教授，博士，从事矿山压力与岩层控制、煤与瓦斯共采方面的研究。
基金资助:
国家自然科学基金项目(51374011)

Rib spalling mechanism and control with fully mechanized longwall mining in large inclination “three-soft” thick coal seam under closed distance mined gob

Received:2015-10-20 Online:2016-07-15 Published:2016-07-25

摘要/Abstract

摘要： 针对大倾角“三软”厚煤层大采高综采工作面煤壁片帮控制难的特点，根据潘北矿12124工作面地质及回采初期矿压显现特征，采用实验分析、理论计算、FLAC^3D数值模拟试验等综合方法，系统分析了12125工作面开采后及12124工作面回采期间采动应力演化特征。基于煤壁片帮破坏形式及塑性区范围计算分析，指出煤体性质、多次采动应力叠加、支架性能是影响煤壁片帮的主要因素，揭示了近距离采空区下大采高综采工作面煤壁片帮机理。提出并实施了提高液压支架工作阻力、煤壁注水、铺双层网等煤壁片帮控制的技术措施，取得了良好效果，保障了工作面安全高效生产，为类似条件工作面设计、煤壁片帮控制及支架设计提供了参考。

关键词: 近距离煤层群, 片帮机理, 采动应力叠加, 稳定性控制, 双层网

Abstract: Rib spalling in “three-soft” thick seam with fully-mechanized and large height mining is difficult to control, especially under closed mined gob, and is still a main safety hazard. Based on geological conditions of No.12124 longwall panel in Panbei coal mine and its strata behaviors during initially extracting process, characteristics and factors of coal spalling have been investigated through lab experimental analyzing, theoretical calculating, and computer simulating with FLAC^3D. Strata behaviors, such as modes of coal wall spalling, mining-induced stress evolution characteristics, deformation and breakage area, have been systematically analyzed and obtained during the mining advancement in No.12124 longwall panel and after No.12125 longwall panel was mined. Coal properties, abutment pressure superposition of multiple-seam mining and performance of hydraulic support are the key factors to result in rib spalling. And the rib spalling mechanism with multiple mining-induce stress superposition in closed distance seams under complex geological conditions has been revealed. Technical measures have been proposed and put into practice, such as to increase support resistance, infuse water into coal, and pave double mesh networks. Engineering practice have shown that three technological applications have achieved safety effectiveness and provided references for longwall panel layout, spalling control, and hydraulic support design in similar geological conditions.

Key words: closed-distance coal seams, rib spalling mechanism, mining-induced stress superimposition, rock stability control, double mesh network

杨科，何祥，刘帅，陆伟. 近距离采空区下大倾角“三软”厚煤层综采片帮机理与控制[J]. 采矿与安全工程学报, 2016, 33(4): 611-617.

YANG Ke，HE Xiang，LIU Shuai，LU Wei. Rib spalling mechanism and control with fully mechanized longwall mining in large inclination “three-soft” thick coal seam under closed distance mined gob[J]. Journal of Mining & Safety Engineering, 2016, 33(4): 611-617.

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