| 深部急倾斜煤层偏压巷道支护参数优化研究 |
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| 引用本文： | 郑朋强,陈卫忠,袁敬强,于建新,杨帆.深部急倾斜煤层偏压巷道支护参数优化研究[J].岩土力学,2014,35(Z2):429-436. |
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| 作者姓名： | 郑朋强 陈卫忠 袁敬强 于建新 杨帆 |
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| 作者单位： | 1.中国科学院武汉岩土力学研究所 岩土力学与工程国家重点实验室，武汉 430071； 2.山东科技大学 资源与土木工程系，山东 泰安271019；3.山东大学 岩土与结构工程研究中心，济南 250061； 4.兖州煤业股份有限公司 东滩煤矿，山东 邹城273500 |
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| 基金项目： | 国家杰出青年基金(No. 51225902)；国家重点基础研究发展计划(973)(No. 2013CB036006)；国家自然科学基金青年科学基金项目(No. 51309217)。 |
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| 摘 要： | 深部急倾斜煤层由于受特殊的地质结构和高地应力影响,煤层巷道开挖后易出现地层错动、垮塌的特点,施工中冒顶、底臌现象异常突出,巷道支护极其困难。通过对新集三矿-700 m煤探巷道进行现场勘查与试验,针对该急倾斜软岩巷道变形非对称性,底臌严重、地层错动的破坏特点,提出了可缩性U型钢全断面封闭支护和非对称性预应力锚杆(索)支护的全新支护方案,通过大型有限元软件ABAQUS建立数值分析模型,与原支护方案进行了对比分析。研究表明,采用改进支护方案巷道底臌位移量减小了66%,最大拉应力从0.58 MPa减小到0.38 MPa,塑性区较原方案更小,支护结构受力更加均匀。其结果可为同类地质条件的巷道支护设计提供一定参考。
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| 关 键 词： | 深部软岩 急倾斜煤层 偏压巷道 支护参数 |
| 收稿时间： | 2014-05-03 |
Study of parameter optimization of support in deep steeply inclined roadway with unsymmetrical loadings |
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| ZHENG Peng-qiang,CHEN Wei-zhong,MENG Xiang-jun,DENG Xiao-lin,LI Wei-qing,BIAN Jing-qiang.Study of parameter optimization of support in deep steeply inclined roadway with unsymmetrical loadings[J].Rock and Soil Mechanics,2014,35(Z2):429-436. |
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| Authors: | ZHENG Peng-qiang CHEN Wei-zhong MENG Xiang-jun DENG Xiao-lin LI Wei-qing BIAN Jing-qiang |
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| Institution: | 1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China; 2.Department of Resources and Civil Engineering, Shandong University of Science and Technology, Tai’an，Shandong 271019, China ; 3. Research Center of Geotechnical and Structural Engineering, Shandong University, Jinan 250061, China ; 4.Dongtan mine, Yanzhou Coal Mining Company Limited, Zoucheng，Shandong 273500, China |
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| Abstract: | Due to the effects of spectacular geological formations and high in-situ stress, the stratigraphic heave after excavation, roof collapse and floor heave in the coal seam roadway in deep steeply inclined soft rock masses are easy to appear, resulting in extremely difficulty in supporting. Through field exploration and tests of roadway in Xinji Coal Mine No.3 -700 m, this paper proposes a new support scheme by applying steel arch of shoring and unsymmetrical prestressed anchor reinforcement in roadway supporting according to the asymmetric deformation, obvious floor heave and the stratigraphic heave deformation. A numerical model is established by finite element software ABAQUS and is compared with the original support scheme. The results show that the displacement of floor heave decreases by 66%; the largest tensile stress reduces from 0.58 MPa to 0.38 MPa, the plastic zone distribution is much smaller than the original scheme; and stress distribution of supporting structure is more uniform by using the improved support scheme. The study can provide useful references to some similar roadways in deep steeply inclined soft rock mass. |
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| Keywords: | deep soft rock steeply inclined coal seam unsymmetrical loading roadway support parameter |
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