基于局部粗粒化离散元的冰水堆积体隧道围岩破坏特征与加固措施研究

doi:10.13722/j.cnki.jrme.2020.0709

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摘要以川藏铁路拉林段藏噶隧道穿越冰水堆积体段为工程背景，基于数字图像技术与离散元方法，在识别冰水堆积体的工程地质特征的基础上，提出一种考虑块石真实形态特征的冰水堆积体局部粗粒化模拟方法，并通过数值计算探讨隧道开挖引起的冰水堆积体围岩破坏特征以及细观破坏机制，最终提出相应的预加固措施。研究结果表明，冰水堆积体隧道围岩在开挖后沿全环渐进式破坏，具体表现为“初始松动区形成–剪切破裂面发育–松动区扩展–剪切破裂面延伸”的动态循环过程，松动区内的颗粒接触劣化证明了土体间的剪切破裂的发育扩展。此外，力链结构特征的演化规律揭示了强力链结构由环状退化为链状，最终导致块石骨架失效、围岩松动破坏这一细观机制。工程应用结果表明，提出的“全断面帷幕注浆+超前管棚+小导管”的预加固措施可显著抑制冰水堆积体隧道围岩破裂面与松动区的发育，有效控制围岩开挖稳定，钻孔取芯与隧道变形监测均满足工程需求。

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	谢亦朋1
	张聪2
	阳军生1
	陈彬3
	傅金阳1
	祝志恒1

关键词 ：隧道工程, 冰水堆积体隧道, 局部粗粒化, 离散元模拟, 破坏特征, 围岩预加固

Abstract：Relying on the engineering background of Zangga tunnel in Lalin section of the Sichuan—Tibet railway，a coarse-grained simulation method considering the shape feature of blocks is built up by using digital image method and discrete element method based on the engineering geological characteristics of the glacial deposits. The failure characteristics and meso-mechanisms of the surrounding rock caused by tunnel excavation are discussed through numerical simulation，and the pre-reinforcement measures of the surrounding rock are proposed. The research shows that the surrounding rock of the glacial deposit tunnel performs a progressive failure model along the whole ring，presenting a dynamic cycle process from initial loosening zone formation，shear fracture surface development，loose zone expansion to shear fracture surface extension. The degradation of particle contact in the loosening zone proves the development of shear fractures in soils. In addition，the evolution of the structural characteristics of the force chain reveals that the structure of the force chain degenerates from a ring shape to a chain shape，which ultimately leads to the failure of the block stone skeleton and the loosening of the surrounding rock. Engineering application results show that，the proposed pre-reinforcement measures of curtain grouting + advanced piperoof + small ducts can significantly inhibit the development of the fractures in surrounding rock and effectively control the excavation stability in the glacial deposit tunnels. Both drilling core and tunnel deformation monitoring results meet engineering requirements.

Key words： tunnelling engineering glacial deposits tunnel local coarse-grained discrete element method simulation failure characteristics pre-reinforcement measures of surrounding rocks

引用本文:

谢亦朋1，张聪2，阳军生1，陈彬3，傅金阳1，祝志恒1. 基于局部粗粒化离散元的冰水堆积体隧道围岩破坏特征与加固措施研究[J]. 岩石力学与工程学报, 2021, 40(3): 576-589.
XIE Yipeng1，ZHANG Cong2，YANG Junsheng1，CHEN Bin3，FU Jinyang1，ZHU Zhiheng1. Study on failure characteristics and reinforcement measures of surrounding rock of glacial deposit tunnels based on coarse-grained DEM. , 2021, 40(3): 576-589.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2020.0709 或 http://rockmech.whrsm.ac.cn/CN/Y2021/V40/I3/576

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