动静力组合作用下深埋隧洞开挖卸荷诱发围岩动力损伤诱因研究

doi:10.13722/j.cnki.jrme.2014.0839

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摘要深埋隧洞开挖形成的二次应力场与爆破开挖卸荷诱发的动力扰动组合作用，是导致围岩损伤破坏的主要原因。首先对深埋圆形隧洞开挖二次应力场静力作用下围岩损伤进行分析，然后以溪洛渡水电站城门洞形导流洞上层中导洞爆破开挖为背景，采用动力有限元方法模拟，对高地应力条件下二次应力场作用下爆炸荷载和开挖荷载瞬态卸荷动力扰动诱发损伤区进行计算，并基于实测的爆破振动速度资料对围岩的本构模型进行对比。结果表明，采用随动强化本构模型的计算结果更符合实测资料；随着地应力的增大，围岩二次应力场与动力扰动组合作用诱发的损伤范围也增大，符合理论分析的结果；考虑瞬态卸荷作用的工况与考虑爆炸荷载的工况相比，诱发损伤围岩的体积有较大增加，因此，随着隧洞埋深的增加，瞬态卸荷将成为诸多动力扰动中的主要因素。对围岩损伤的控制，不仅包含减小进尺和单响药量，还可以考虑将掌子面分成多个小断面进行开挖，或利用超前孔释放地应力等减弱开挖荷载瞬态卸荷强度的方法。

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关键词 ：隧道工程, 深埋隧洞, 瞬态卸荷, 爆破开挖, 动力损伤, 动静力组合作用

Abstract：The combination of statistic secondary stress field and dynamic disturbance induced by blasting excavation is the major cause of internal damage of rock mass. The static secondary stress field was calculated for a circle tunnel. Then based on the up-layer excavation of city-gate section diversion tunnel of Xiluodu hydropower station，dynamic analysis was conducted. The damage area induced by the combination of static secondary stress field and dynamic disturbance was calculated. During this process，a comparison was made for different material models，based on regression analysis of calculated blasting vibration values and monitored data in field. Result calculated with kinetic-hardening model complies better with the monitored data. As the in-situ stress field increases，the damage area induced by the combination of static and dynamic effect. However，with in-situ stress transient unloading considered，the volume of damaged rock mass is largely increased. Therefore，the transient process of in-situ stress unloading should be considered in blasting excavation of deep underground tunnels. Besides reducing step length or total charge in one delay，prolong the unloading process for in-situ stress is also a measure applicable for controlling rock mass damage.

Key words： tunnelling engineering deep underground tunnel transient unloading blasting excavation dynamic damage static-dynamic combination

引用本文:

罗忆1，2，李新平1，董千1，2，黄俊红1，2，郭运华1. 动静力组合作用下深埋隧洞开挖卸荷诱发围岩动力损伤诱因研究[J]. 岩石力学与工程学报, 2015, 34(s1): 3365-3371.
LUO Yi1，2，LI Xinping1，DONG Qian1，2，HUANG Junhong1，2，GUO Yunhua1. DAMAGE CAUSE STUDY FOR STATIC AND DYNAMIC COMBINATION OF EXCAVATION AND UNLOADING IN DEEP UNDERGROUND TUNNELS. , 2015, 34(s1): 3365-3371.

链接本文:

http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2014.0839 或 http://www.rockmech.org/CN/Y2015/V34/Is1/3365

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