浅埋沿空留巷切缝顶板断裂条件及移动规律研究

张国锋; 苗沛沛; 王二雨; 陈新

浅埋沿空留巷切缝顶板断裂条件及移动规律研究

张国锋^1,2,
苗沛沛^1,2,
王二雨^1,2,
陈新^1,2

1.
中国矿业大学(北京)力学与建筑工程学院,北京100083;2.深部岩土力学与地下工程国家重点实验室,北京100083

基金项目: 教育部高校博士点基金(20130023120011);中央高校基本科研业务费专项资金(2012800015DQ)

详细信息

作者简介:
张国锋(1982—),男,河南灵宝人,讲师,硕士生导师,主要从事无煤柱开采方面的研究。

中图分类号: TD322
计量
- 文章访问数: 795
- HTML全文浏览量: 63
- PDF下载量: 781
- 被引次数: 0
出版历程
- 收稿日期: 2016-10-26
- 刊出日期: 2017-04-29

Research on roof fracture criterion and moving rule of gob-side entry in shallow seam

1.
School of Civil and Architecture Engineering,China University of Mining and Technology,Beijing 100083,China;2.State Key Laboratory for Geomechanics and Deep Underground Engineering,Beijing 100083,China

摘要

摘要: 根据浅埋煤层顶板断裂后岩块间水平挤压力较小难以形成砌体梁的特点,分析了切顶卸压沿空成巷下的巷道顶板断裂结构,建立了下位切缝上位弯曲裂缝的双边悬臂梁的断裂力学模型,推导了沿空巷道侧向基本顶沿切缝结构面裂缝扩展断裂时的切顶工作阻力;建立了侧向基本顶两种不同顶板断裂位态下围岩结构数值模型,得出了两种断裂位态下的结构移动变形规律。当切顶阻力Q«ql时,巷道顶板沿煤壁内一定深度内断裂,空区侧弧形三角板直接顶的倒台阶悬臂结构可向沿空巷道围岩传递较大破断动载和覆岩移动压力;而当切顶阻力Q≥ql并与切缝联合切顶同时作用时,则可使得垮落带内直接顶和低位基本顶沿切缝结构面断裂滑落失稳,实现顶板断裂位态主动控制,减小弧形三角板侧向悬臂传递覆岩荷载的结构长度,优化顶板承载结构和围岩应力,降低巷旁支护体承受的附加荷载。同时切落后碎胀的矸石及时充填空区将上覆岩触矸点前移,减缓了上覆岩下沉和旋转变形作用力。哈拉沟矿浅埋薄基岩大断面复合顶板切顶成巷试验结果表明:沿空巷道超前切缝可减小侧向顶板区域支架工作阻力和直接顶垮落步距,降低岩板破断引起的冲击动载,实际切顶阻力与理论计算分析结果较为吻合。
- 浅埋 /
- 大断面 /
- 顶板切缝 /
- 覆岩移动 /
- 矿压规律
Abstract: Based on the characteristics that horizontal pressure between rocks is too small to form masonry beam after roof fracture in shallow-buried coal seam,the retaining gob-side entry fracture structure formed by falling down cutting roof.It was established that fracture mechanical model of lower slitting and upper bending cracks bilateral cantilever beam.The cutting-top working resistance was derived as the lateral basic roof fracture extends along the cracks of the cutting seam structure.The numerical model of surrounding rock structure under two fracture states of lateral basic roof was built.The movement and deformation law under two states of fracture structure indicated: When the cutting resistance is low,the roof breaks along the coal wall inside certain depth.The pour terraced cantilever beam of arc triangle direct roofs in emptied stope,can transfer large fracture dynamic load and overlying strata movement pressure along emptied roadway surrounding rock.With the unit cutting action of high shear resistance and cutting seam,the direct roof of caving zone and low basic roof were cut to slide along the cutting seam structure.It could reduce the structure length of transferring the overburden strata load from the side of arc triangle hanging deck,and optimize the roof bearing structure and surrounding rock stress,and also could reduce the additional load bore by the support body in the roadside by implementing active control of roof fracture state.At the same time,the hulking of waste rock could fill the empty area and make the overlying rock contact point move forward,and slow down the sinking and rotational deformation force of overlying rock.In the condition of the shallow seam and thin bedrock of Halagou mine,the observation of cutting large cross-section compounded roof experiment indicated that: advanced slitting on gob-side roadway can reduce support working resistance of lateral roof and immediate roof caving step distance.It could also reduce the roof fracture dynamic load caused by rock plate breakage.The actual cutting resistance dovetailed with the theoretical calculation results.
- shallow seam /
- large cross-section /
- cutting seam of roof /
- overlying strata movement /
- mine pressure regularity

HTML全文

参考文献(31)

[1]	钱鸣高,石平五.矿山压力与岩层控制[M].徐州:中国矿业大学出版社,2003.
[2]	宋振骐.实用矿山压力控制[M].徐州:中国矿业大学出版社,1988.
[3]	康红普,牛多龙,张震,等.深部沿空留巷围岩变形特征与支护技术[J].岩石力学与工程学报,2010,29(10):1978-1987.
[4]	Kang Hongpu,Niu Duolong,Zhang Zhen,et al.Deformation characteristic of surrounding rock and supporting technology of gob-side entry retaining in deep coal mine[J].Chinese Journal of Rock Mechanics and Engineering,2010,29(10):1978-1987.
[5]	柏建彪,周华强,侯朝炯,等.沿空留巷巷旁支护技术的发展[J].中国矿业大学学报,2004,33(2):183-186.
[6]	Bai Jianbiao,Zhou Huaqiang,Hou Chaojiong,et al.Development of support technology beside roadway in goaf-side entry retaining for next sublevel [J].Journal of China University of Mining & Technology,2004,33(2):183-186.
[7]	张农,张志义,吴海,等.深井沿空留巷扩刷修复技术及应用[J].岩石力学与工程学报,2014,33(3):468-474.
[8]	Zhang Nong,Zhang Zhiyi,Wu Hai,et al.Technology and application of reparation in deep gobside entry retain[J].Chinese Journal of Rock Mechanics and Engineering,2014,33(3):468-474.
[9]	He Manchao,Zhu Guolong,Guo Zhibiao.Longwall mining “cutting cantilever beam theory” and 110 mining method in China—The third mining science innovation[J].Journal of Rock Mechanics and Geotechnical Engineering,2015,31(7):483-492.
[10]	阚甲广,张农,李宝玉,等.典型留巷顶板条件巷旁充填体支护阻力分析[J].岩土力学,2011,32(9):2778-2784.
[11]	Kan Jiaguang,Zhang Nong,Li Baoyu,et al.Analysis of supporting resistance of backfilling wall for gobside entry retaining under typical roof conditions[J].Rock and Soil Mechanics,2011,32(9):2778-2784.
[12]	郭建伟,赵家巍.沿空留巷下位顶板破断规律与控制机理研究[J].采矿与安全工程学报,2012,29(6):802-806.
[13]	Guo Jianwei,Zhao Jiawei.Study on breaking law and control mechanism of lower roof in gobside entry retaining [J].Journal of Mining & Safety Engineering,2012,29(6):802-806.
[14]	闫少宏,尹希文,许红杰.大采高综采顶板短悬臂梁-铰接岩梁结构与支架工作阻力的确定[J].煤炭学报,2011,36(11):1816-1820.
[15]	Yan Shaohong,Yin Xiwen,Xu Hongjie.Roof structure of short cantileverarticulated rock beam and calculation of support resistance in fullmechanized face with large mining height [J].Journal of China Coal Society,2011,36(11):1816-1820.
[16]	蒋斌松,张强,韩立军.采动岩层荷载计算方法修正[J].煤炭学报,2007,32(6):581-585.
[17]	Jiang Binsong,Zhang Qiang,Han Lijun.Modification of calculation method for the load of mining-induced strata[J].Journal of China Coal Society,2007,32(6):581-585.
[18]	于斌,刘长友,杨敬轩.坚硬厚层顶板的破断失稳及其控制研究[J].中国矿业大学学报,2013,42(3):342-348.
[19]	Yu Bin,Liu Changyou,Yang Jingxuan.Research on the fracture instability and its control technique of hard and thick roof[J].Journal of China University of Mining & Technology,2013,42(3):342-348.
[20]	孙晓明,刘鑫,梁广峰,等.薄煤层切顶卸压沿空留巷关键参数研究[J].岩石力学与工程学报,2014,33(7):1449-1456.
[21]	Sun Xiaoming,Liu Xin,Liang Guangfeng,et al.Key parameters of gob-side entry retaining formed by roof cut and pressure releasing in thin seams[J].Chinese Journal of Rock Mechanics and Engineering,2014,33(7):1449-1456.
[22]	张国锋,何满潮,俞学平,等.白皎矿保护层沿空切顶成巷无煤柱开采技术研究[J].采矿与安全工程学报,2011,28(4):511-516.
[23]	Zhang Guofeng,He Manchao,Yu Xueping,et al.Research on the technique of no-pillar mining with gob-side entry retaining formed by advanced roof caving in the protective seam in baijiao coal mine[J].Journal of Mining & Safety Engineering,2011,28(4):511-516.
[24]	张国锋,许有青,葛鹏涛.唐山沟矿厚层砂岩顶板切缝沿空成巷试验研究[J].岩石力学与工程学报,2016,35(7):1397-1406.
[25]	Zhang Guofeng,Xu Youqing,Ge Pengtao.Research on cut gob-side entry retaining in thin coal seam of tangshan ditch[J].Chinese Journal of Rock Mechanics and Engineering,2016,35(7):1397-1406.
[26]	张国锋,俞学平,杨纯华.沿空巷道切顶围岩变形控制机理及工程应用[J].煤炭学报,2016,41(S1):36-43.
[27]	Zhang Guofeng,Yu Xueping,Yang Chunhua.Study on deformation control of gob-side entry retaining with roof cutting and engineering application[J].Journal of China Coal Society,2016,41(S1):35-43.
[28]	中国航空研究院.应力强度因子手册[M].北京:科学出版社,1981:120-127.
[29]	于骁中,谯常忻,周群力.岩石和混凝土断裂力学[M].长沙:中南工业大学出版社,1991:230-278.
[30]	侯朝炯,马念杰.煤层巷道两帮煤体应力和极限平衡区的探讨[J].煤炭学报,1989,14(4):21-29.
[31]	Hou Chaojiong,Ma Nianjie.Stress in inseam roadway sides and limit equilibrium zone[J].Journal of China Coal Society,1989,14(4):21-29.

施引文献

资源附件(0)

访问统计

点击查看大图

计量

文章访问数: 795
HTML全文浏览量: 63
PDF下载量: 781
被引次数: 0

姓名
邮箱
手机号码
标题
留言内容
验证码

留言板

浅埋沿空留巷切缝顶板断裂条件及移动规律研究

作者简介:
张国锋(1982—),男,河南灵宝人,讲师,硕士生导师,主要从事无煤柱开采方面的研究。

计量

Research on roof fracture criterion and moving rule of gob-side entry in shallow seam

计量

目录

留言板

浅埋沿空留巷切缝顶板断裂条件及移动规律研究

作者简介: 张国锋(1982—),男,河南灵宝人,讲师,硕士生导师,主要从事无煤柱开采方面的研究。

计量

出版历程

Research on roof fracture criterion and moving rule of gob-side entry in shallow seam

计量

出版历程

目录

作者简介:
张国锋(1982—),男,河南灵宝人,讲师,硕士生导师,主要从事无煤柱开采方面的研究。