含软弱夹层隧道围岩松动破坏模型试验与分析

doi:10.13722/j.cnki.jrme.2015.0200

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摘要软弱夹层对隧道围岩稳定起着决定性作用，其松动区、破坏区的形成机制及范围是制定合理支护措施的重要依据。以穿越断层带的高速公路隧道工程为背景，利用室内相似模型试验，对无支护条件下软弱夹层围岩松动区、破坏区的发展过程进行了研究。引入弹塑性损伤本构模型，对试验工况进行有限元数值模拟，与模型试验进行对比验证。研究表明：(1) 隧道围岩松动区与破坏区具有相似的形成机制，受到软弱夹层的影响，围岩由下盘局部破坏开始扩展至上盘形成拱形为止；(2) 隧道开挖后上盘围岩内的应力变化明显大于下盘围岩，根据周向应力增量大小，可以确定出围岩松动区的范围；(3) 数值分析中采用损伤变量判别的围岩破坏区与模型试验吻合较好，具有理论可行性。

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	黄锋1
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关键词 ：岩石力学, 软弱夹层, 隧道围岩, 松动破坏, 模型试验, 数值模拟

Abstract：Since weak interlayer often has a deterministic effect on the stability of tunnel surrounding rock mass. Its formation mechanism and area of loosening and failure zoon are the important basis for deciding reasonable support method. By taking a high way tunnel engineering through faults，lab similar model test was chosen to study the progressive process of surrounding rock mass loosening and failure zoon with weak interlayer in the case of no support system. An elasto-plastic damage constitutive model is introduced to numerically simulate the case of model test by FEM，which will be compared with model test. The study shows that：(1) the loosening zone and failure one of tunnel surrounding rock mass have similar formation mechanism with each other，which are initialize at lower part and expanded to upper one with arch shape because of the impact of interlayer. (2) The surrounding rock mass stress variations of upper part are obviously bigger than those of lower one after tunnel excavation. Based on the value of tangential stress increment，the area of loosening zone can be determinate. (3) Discriminating by damage variable in numerical analysis，the failure zoon of surrounding rock mass has a good agreement with that of model test，which is proved theoretically feasible.

Key words： rock mechanics weak interlayer tunnel surrounding rock loosening and failure model test numerical simulation

引用本文:

黄锋1，2，朱合华3，徐前卫4. 含软弱夹层隧道围岩松动破坏模型试验与分析[J]. 岩石力学与工程学报, 2016, 35(S1): 2915-2924.
HUANG Feng1，2，ZHU Hehua3，XU Qianwei4. Model test and analysis about loose failure of tunnel surrounding rock mass containing weak interlayer. , 2016, 35(S1): 2915-2924.

链接本文:

https://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2015.0200 或 https://rockmech.whrsm.ac.cn/CN/Y2016/V35/IS1/2915

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