基于离散元法的爆破荷载作用下深埋隧道失稳破坏模拟研究
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摘要
为了研究爆破扰动对深部隧道工程的影响,借助颗粒流程序PFC,开展爆破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过程和相同埋深隧道围岩颗粒位移与应力随时间的变化规律。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裂隙,而在高地应力的持续作用下,可能引起岩块的剥离和弹射;隧道两帮的竖向压应力大于岩体抗压强度是隧道围岩破裂的主要机制。研究成果为深埋隧道支护技术和灾害预报研究提供了依据。
The influence of disturbance from blasting on deep tunnel engineering are study by using PFC. The damage evolution process of surrounding rock of tunnel in different buried depths and the change law 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. The mechanism of rupture of surrounding rock is that the vertical compressive stress on both sides of tunnel is greater than the compressive strength of rock mass. The research results provide a meaningful basis for the support technology and disaster prediction of deep tunnels.
The influence of disturbance from blasting on deep tunnel engineering are study by using PFC. The damage evolution process of surrounding rock of tunnel in different buried depths and the change law 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. The mechanism of rupture of surrounding rock is that the vertical compressive stress on both sides of tunnel is greater than the compressive strength of rock mass. The research results provide a meaningful basis for the support technology and disaster prediction of deep tunnels.
引文
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[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):1729-1739.
[8] Kaiser PK,Tannant DD,Mc Creath DR(1996)Canadian rockburst support handbook. Geomechanics Research Centre/Laurentian University,Sudbury/Ontario.
[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 tunnels subjected to static and dynamic loads[J]. Journal of 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):177-184.
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