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郭新新, 汪波, 王振宇, 于家武. 考虑蠕变特性的高应力软岩隧道变形预测方法与实践[J]. 岩土工程学报, 2023, 45(3): 652-660. DOI: 10.11779/CJGE20220058
引用本文: 郭新新, 汪波, 王振宇, 于家武. 考虑蠕变特性的高应力软岩隧道变形预测方法与实践[J]. 岩土工程学报, 2023, 45(3): 652-660. DOI: 10.11779/CJGE20220058
GUO Xinxin, WANG Bo, WANG Zhenyu, YU Jiawu. Methods and practices for deformation prediction in high-stress soft rock tunnels considering creep characteristics[J]. Chinese Journal of Geotechnical Engineering, 2023, 45(3): 652-660. DOI: 10.11779/CJGE20220058
Citation: GUO Xinxin, WANG Bo, WANG Zhenyu, YU Jiawu. Methods and practices for deformation prediction in high-stress soft rock tunnels considering creep characteristics[J]. Chinese Journal of Geotechnical Engineering, 2023, 45(3): 652-660. DOI: 10.11779/CJGE20220058

考虑蠕变特性的高应力软岩隧道变形预测方法与实践

Methods and practices for deformation prediction in high-stress soft rock tunnels considering creep characteristics

  • 摘要: 为研究高应力软岩蠕变特性对隧道围岩变形预测的影响,以木寨岭公路隧道为依托,首先采用三维计算模型与多元线性回归相结合的方法分析初始地应力场,并结合围岩段落划分,选择典型计算断面;其次,提出基于BQ值的围岩参数取值方法,确定典型计算断面的围岩参数;而后,开展基于M-C模型和Cvsic模型的断面变形计算,剖析岩体蠕变特性对围岩变形的影响;最终,对比了预测结果与实际围岩变形。结果表明:①岩体蠕变特性对围岩变形具有明显增大效应,围岩位移增长量与横断面平均主应力呈正相关;②围岩条件越差,蠕变增大效应越显著;横断面平均主应力越大,蠕变增大效应中位移增长量越大,而位移增长率变化不明显;③蠕变特性对围岩变形等级预测有明显影响,M-C模型预测结果弱于Cvisc模型,与实际围岩变形情况存在较大差异。研究结果为在高应力软岩隧道变形预测中引入岩体蠕变效应奠定了实践基础。

     

    Abstract: To study the influences of high-stress soft rock creep characteristics on deformation prediction of surrounding rock of tunnels, the Muzhailing highway tunnel is taken as the support project. Firstly, the initial ground stress field is analyzed using a three-dimensional simulation model combined with multiple linear regression. The typical calculation sections are selected in conjunction with the section division of the surrounding rock. Secondly, the relevant method based on the BQ value is proposed to determine the parameters of the surrounding rock in the typical calculation section. Then, the section deformation is calculated based on the M-C model and the Cvsic model to analyze the influences of the creep characteristics of rock on the deformation of the surrounding rock. Finally, the predicted results are compared with the actual ones. The results show that: (1) The creep characteristics of rock mass have significant increase effects on the deformation, and the displacement growth rate is positively correlated with the average principal stress of cross-section. (2) The worse the surrounding rock condition, the more pronounced the creeping increase effects. The greater the average principal stress of the cross-section, the larger the displacement growth rate in the creep increase effects, while the change in the displacement growth rate is less noticeable. (3) The creep characteristics have significant effects on the prediction of the deformation level of the surrounding rock. The predicted results by the M-C model are weaker than those by the Cvisc model, which are pretty different from the actual deformations of the surrounding rock. The results lay a practical foundation for introducing the creep effects into the deformation prediction of high-stress soft rock tunnels.

     

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