爆破动荷载作用下深埋隧道失稳破坏模拟研究
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摘要
为了研究爆破动态扰动对深部隧道工程的影响,借助颗粒流程序PFC开展爆破动荷载作用下深埋隧道失稳破坏的数值模拟,分析了不同埋深隧道围岩的损伤演化规律。研究结果表明:在距离隧道一定高度的顶面施加爆破动荷载,随着埋深的增加,围岩损伤程度越严重,损伤集中于隧道的两帮,并逐渐由隧道右侧向顶板发展;隧道的失稳破坏是由爆破荷载和地应力共同造成的,爆破荷载主要使隧道围岩产生节理裂隙,而在高地应力的持续作用下,可能引发岩块的剥离和弹射。
To study the influence of dynamic disturbance of blasting on deep tunnel engineering, numerical simulation of deep tunnel under blasting load is carried out by using PFC. The damage evolution process of surrounding rock of tunnel in different buried depths and the change laws of particle displacement and stress of surrounding rock of tunnel in the same depth are analyzed.The results show that the damage of rock on both sides of tunnel is more serious than other areas when blasting load is applied on the top surface of the tunnel rock model. With the increase of buried depth, the damage firstly appears on both sides of tunnel and then gradually extends from the right side to the roof of tunnel. The failure of tunnel is mainly caused by blasting load and in situ stress, blasting load results in joints of surrounding rock where rock spalling and ejection may finally occur because of the constant in-situ stress.
To study the influence of dynamic disturbance of blasting on deep tunnel engineering, numerical simulation of deep tunnel under blasting load is carried out by using PFC. The damage evolution process of surrounding rock of tunnel in different buried depths and the change laws of particle displacement and stress of surrounding rock of tunnel in the same depth are analyzed.The results show that the damage of rock on both sides of tunnel is more serious than other areas when blasting load is applied on the top surface of the tunnel rock model. With the increase of buried depth, the damage firstly appears on both sides of tunnel and then gradually extends from the right side to the roof of tunnel. The failure of tunnel is mainly caused by blasting load and in situ stress, blasting load results in joints of surrounding rock where rock spalling and ejection may finally occur because of the constant in-situ stress.
引文
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[3]赵景彭.节理倾角对层状岩体大断面隧道稳定性研究[J].铁道建筑,2011(9):58-61.
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[6]陈国庆,李天斌,何勇华,等.深埋硬岩隧道卸荷热-力效应及岩爆趋势分析[J].岩石力学与工程学报,2013,32(8):1554-1563.
[7]何满潮,刘冬桥,宫伟力,等.冲击岩爆试验系统研发及试验[J].岩石力学与工程学报,2014,33(9):1729.
[8] Kaiser PK, Tannant DD, McCreath DR.Canadianrock-burstsupport handbook[R]. Sudbury:Geomechanics Re-search Centre, LaurentianUniversity, 1996.
[9]张露晨,李育慧,李树忱,等.动荷载作用下隧道围岩块体稳定性分析及其应用[J].岩土力学,2016,37(11):3275-3282.
[10] Manouchehrian A, Cai M.Analysis of rockburst in tun-nels subjected to static and dynamic loads[J]. Journalof Rock Mechanics&Geotechnical Engineering, 2017,9(6):12-23.
[11]刘思妤,徐则民.基于动-静应力耦合的深埋隧道岩爆灾害控制[J].自然灾害学报,2010,19(1):177.
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[13]许红涛,卢文波,周小恒.爆破震动场动力有限元模拟中爆破荷载的等效施加方法[J].武汉大学学报(工学版),2008,41(1):67-71.
[14]卢文波,陶振宇.预裂爆破中炮孔压力变化历程的理论分析[J].爆炸与冲击,1994,13(2):140-147.
[15]蔡美峰.岩石力学与工程[M].北京:科学出版社,2013.
[16]方玉树,黄家愉.关于工程勘察和勘察规范几个重要术语的讨论———《工程地质勘察规范》(DBJ50-043-2005)讲座之一[J].重庆建筑,2006(8):68-72.