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主应力方向对围岩稳定性的影响

李元鑫, 朱哲明, 范君黎

李元鑫, 朱哲明, 范君黎. 主应力方向对围岩稳定性的影响[J]. 岩土工程学报, 2014, 36(10): 1908-1914. DOI: 10.11779/CJGE201410019
引用本文: 李元鑫, 朱哲明, 范君黎. 主应力方向对围岩稳定性的影响[J]. 岩土工程学报, 2014, 36(10): 1908-1914. DOI: 10.11779/CJGE201410019
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LI Yuan-xin, ZHU Zhe-ming, FAN Jun-li. Effect of principal stress orientation on stability of surrounding rock of tunnels[J]. Chinese Journal of Geotechnical Engineering, 2014, 36(10): 1908-1914. DOI: 10.11779/CJGE201410019
Citation: LI Yuan-xin, ZHU Zhe-ming, FAN Jun-li. Effect of principal stress orientation on stability of surrounding rock of tunnels[J]. Chinese Journal of Geotechnical Engineering, 2014, 36(10): 1908-1914. DOI: 10.11779/CJGE201410019
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主应力方向对围岩稳定性的影响  English Version

  • 四川大学建筑与环境学院,四川 成都 610065

基金项目: 国家重点基础研究发展计划（973计划）项目（2010CB732005）; 国家自然科学基金项目（51074109）; 四川省科技计划项目（2014JY0002）; 油气藏地质及开发工程国家重点实验室资助项目（PLN1202）
详细信息
    作者简介:

    李元鑫(1986- ),男,博士研究生,主要从事岩土工程方面的研究工作。E-mail: yuanxinli328@gmail.com。

Effect of principal stress orientation on stability of surrounding rock of tunnels

  • School of Architecture and Environment, Sichuan University, Chengdu 610065, China

摘要

    摘要
  • 摘要: 采用模型试验和数值模拟方法研究了在不同方向的主应力作用下,直墙拱形隧道的围岩损伤破坏规律,考虑了隧道内含有裂纹和不含裂纹两种情况,利用水泥砂浆制作了直墙拱形隧道模型,并利用有机玻璃光弹试验对无裂纹隧道的试验结果加以验证;数值模拟采用混凝土损伤塑性模型,计算出隧道周边各点的应力,而对于含有裂纹的隧道计算了裂纹尖端的无量纲应力强度因子YⅠ和YⅡ,与模型试验结果吻合较好。结果表明：对于无裂纹的隧道,当主应力方向与隧道垂直边墙的夹角=45°左右时,隧道的抗压强度最低;对于带裂纹的隧道,当裂纹与垂直边墙的夹角=130°时,裂纹尖端无量纲应力强度因子YⅡ最大,其隧道强度最低;对于含有裂纹且=130°的直墙拱形隧道,当主应力方向与隧道垂直边墙的夹角较小时或在70°左右时,隧道的抗压强度最低。
    Abstract: In order to investigate the effect of principal stress orientation on the stability of the surrounding rock of tunnels, experimental and numerical studies are performed. Cement mortar models are applied, and two cases for the tunnel with and without cracks are considered. Photoelastic experiments are conducted to confirm the results of the cement mortar model tests. In the numerical simulation, the plastic damage of concrete damaged plasticity is adopted. The stresses at the points around the tunnel and the stress intensity factor of crack tips are calculated, and the results are in good agreement with the experimental ones. The results show that for the tunnel without cracks, when the angel of principal stress orientation and tunnel wall θ =45°, the compressive strength is the lowest; for the tunnel with a crack, when the angel of crack direction and tunnel wall β=130°, the stress intensity factor of crack tips is the largest, and the compressive strength is the lowest, and for the tunnel with β=130°, when θ was small or θ=70°, the lowest compressive strength occurs.
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出版历程
  • 收稿日期:  2013-12-30
  • 发布日期:  2014-10-19

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