基于ABAQUS有限元数值分析的软弱煤岩体巷道锚杆孔底扩孔力学特征研究
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摘要
针对松软煤岩体巷道锚杆支护时出现锚固力低、锚固力衰减速度快等问题,基于ABAQUS有限元数值模拟软件,模拟分析了软煤和砂质泥岩两种情况下锚杆孔底扩孔后的孔壁围岩力学特征。结果表明:在相同围压作用下,扩孔段直径与围岩的强度呈负相关关系;相同岩性条件下,扩孔段最大直径与围压大小也呈负相关关系;验证了在煤及砂质泥岩中能达到较好的扩孔效果。在井下现场采用研制的单翼扩孔装置,分别在软煤和砂质泥岩条件下进行扩孔锚固试验,软煤和砂质泥岩扩孔锚固力显著大于不扩孔状态的锚固力。
In view of the problems of low anchorage force and fast for decay rate in the bolting of loose coalrock mass roadway,the finite element numerical simulation software ABAQUS was used to simulate and analyze wall rock mechanical characteristics of the bolt-holes reaming in the sandy mudstone and soft coal seam. The results showed that under the same confining pressure,the diameter of the reaming section was negatively correlated with the strength of the surrounding rock. Under the same lithologic condition,the maximum diameter of the reaming section was negatively correlated with the confining pressure,which verified the characteristics of coal seam and sandy mudstone can meet better reaming effect. The reaming and anchoring tests were carried out in soft coal seam and sandy mudstone with a single-wing reaming device that developed in situ. The anchorage force of bolt-hole reaming in soft coal seam and sandy mudstone was significantly larger than that of bolthole non-reaming.
In view of the problems of low anchorage force and fast for decay rate in the bolting of loose coalrock mass roadway,the finite element numerical simulation software ABAQUS was used to simulate and analyze wall rock mechanical characteristics of the bolt-holes reaming in the sandy mudstone and soft coal seam. The results showed that under the same confining pressure,the diameter of the reaming section was negatively correlated with the strength of the surrounding rock. Under the same lithologic condition,the maximum diameter of the reaming section was negatively correlated with the confining pressure,which verified the characteristics of coal seam and sandy mudstone can meet better reaming effect. The reaming and anchoring tests were carried out in soft coal seam and sandy mudstone with a single-wing reaming device that developed in situ. The anchorage force of bolt-hole reaming in soft coal seam and sandy mudstone was significantly larger than that of bolthole non-reaming.
引文
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[16]张魁,夏毅敏,谭青,等.不同围压条件下TBM刀具破岩模式的数值研究[J].岩土工程学报,2010(11):1780-1787.ZHANG K,XIA Y M,TAN Q,et al. Numerical study on modes of breaking rock by TBM cutter under different confining pressures[J]. Chinese Journal of Geotechnical Engineering,2010(11):1780-1787.
[17]邹金锋,彭建国,张进华,等.基于非线性Mohr-Coulomb强度准则下的扩孔问题解析[J].土木工程学报,2009(7):90-97.ZOU J F,PENG J G,ZHANG J H,ea al. Analytical solution of cavity expansion with the non-linear MohrCoulomb failure rule[J]. China Civil Engineering Journal,2009(7):90-97.
[2]康红普.煤巷锚杆支护成套技术研究与实践[J].岩石力学与工程学报,2005,24(21):161-166.KANG H P. Study and application of complete rock bolting technology to coal roadway[J]. Chinese Journal of Rock Mechanics and Engineering,2005,24(21):161-166.
[3]尤春安.锚固系统应力传递机理理论及应用研究[J].岩石力学与工程学报,2005,24(7):1272.YOU C A. Theory and application study on stress-transfer mechanism of anchoring system[J]. Chinese Journal of Rock Mechanics and Engineering,2005,24(7):1272.
[4]王金华.我国煤巷锚杆支护技术的新发展[J].煤炭学报,2007,32(2):113-118.WANG J H. New development of rock bolting tech-nology for coal roadway in China[J]. Journal of China Coal Society,2007,32(2):113-118.
[5]郝凤山,齐有军.锚杆扩孔技术及锚固力试验研究[J].煤炭学报,2008,33(12):1358-1361.HAO F S,QI Y J. Research of embrasure reaming and anchoring force experimentation[J]. Journal of China Coal Society,2008,33(12):1358-1361.
[6]胡跃敏,刘国生,辛亚军,等.松软煤体中锚杆支护锚固体形成机理分析[J].河南理工大学学报(自然科学版),2014,33(5):576-581.HU Y M,LIU G S,XIN Y J,et al. Analysis of boltingbody formation mechanism in soft coal seam[J]. Journal of Henan Polytechnic University(Natural Science),2014,33(5):576-581.
[7]王俊生.松软破碎岩层巷道的掘进与支护[J].河南理工大学学报(自然科学版),2010,29(s1):158-163.WANG J S. The tunneling and support of soft and broken rock roadway[J]. Journal of Henan Polytechnic University(Natural Science),2010,29(s1):158-163.
[8]郜进海,镐振,吕兆恒,等.软煤层巷道支护数值模拟研究[J].河南理工大学学报(自然科学版),2012,31(6):664-668.GAO J H,HAO Z,LV Z H,et al. Numerical simulation study on support of roadway in soft coal seam[J]. Journal of Henan Polytechnic University(Natural Science),2012,31(6):664-668.
[9]陆观宏,曾庆军,黄敏,等.锚杆扩孔技术应用于某高层建筑基础加固[J].土工基础,2011,25(5):20-22.LU G H,ZENG Q J,HUANG M,et al. Applications of soil anchor borehole enlargement techniques in the foundation rehabilitation of a High-raised build-ing[J]. Soil Engineering and Foundation,2011,25(5):20-22.
[10]陈继平,董玉庆,钱健清,等.热轧马氏体和贝氏体双相钢扩孔性能及机理[J].中南大学学报(自然科学版),2014(2):395-400.CHEN J P,DONG Y Q,QIAN J Q,et al. Hole expansion property and mechanism of ferrite+martensite and ferrite+bainite hot-rolled dual phase steels[J]. Journal of Central South University(Science and Technology),2014(2):395-400.
[11]周航,孔纲强,刘汉龙.正方形孔扩张的弹性分析[J].工程力学,2013(12):183-188.ZHOU H,KONG G Q,LIU H L. Elastic analysis of square cavity expansion[J]. Engineering Mechanics,2013(12):183-188.
[12]贾尚华,赵春风,赵程.砂土中柱孔扩张问题的扩孔压力与扩孔半径分析[J].岩石力学与工程学报,2015,34(1):182-188.JIA S H,ZHAO C F,ZHAO C. Analysis of expanded radius and internal expanding pressure of cylindrical hole[J]. Chinese Journal of Rock Mechanics and Engineering,2015,34(1):182-188.
[13]肖昭然,张昭,杜明芳.饱和土体小孔扩张问题的弹塑性解析解[J].岩土力学,2004(9):1373-1378.XIAO Z R,ZHANG Z,DU M F. An elastoplastic closed-form approach of cavity expansion in saturated soil based on modified cam clay model[J]. Rock and Soil Mechanics,2004(9):1373-1378.
[14]马骏.扩孔型锚固技术在西安地铁工程中的应用[J].中国安全生产科学技术,2011,7(9):195-198.MA J. Application of enlarged anchor hole technology in Xi’an subway project[J]. Journal of Safety Science and Technology,2011,7(9):195-198.
[15]陆观宏,曾庆军,潘艳珠,等.锚杆扩孔技术及其应用研究[J].公路交通科技(应用技术版),2012,8(2):26-30.LU G H,ZENG Q J,PAN Y Z,et al. Research on bolt hole reaming technology and its application[J]. Highway Traffic Technology(Application Technology Edition),2012,8(2):26-30.
[16]张魁,夏毅敏,谭青,等.不同围压条件下TBM刀具破岩模式的数值研究[J].岩土工程学报,2010(11):1780-1787.ZHANG K,XIA Y M,TAN Q,et al. Numerical study on modes of breaking rock by TBM cutter under different confining pressures[J]. Chinese Journal of Geotechnical Engineering,2010(11):1780-1787.
[17]邹金锋,彭建国,张进华,等.基于非线性Mohr-Coulomb强度准则下的扩孔问题解析[J].土木工程学报,2009(7):90-97.ZOU J F,PENG J G,ZHANG J H,ea al. Analytical solution of cavity expansion with the non-linear MohrCoulomb failure rule[J]. China Civil Engineering Journal,2009(7):90-97.