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Numerical analyses of braced excavation in granular grounds: continuum and discrete element approaches

机译：粒状地基中支护开挖的数值分析：连续和离散元方法

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摘要

Numerical simulations have been extensively used in braced excavation design. However, previous analyses indicate that the universally adopted constitutive models such as Mohr-Coulomb (M-C) model and Drucker-Prager (D-P) model need to be further clarified due to the unsatisfactory prediction of the ground deformation. This study focuses on the features that future continuum models should capture for braced excavation in granular ground. For this purpose, a simplified braced excavation in granular ground was simulated using the distinct element method (DEM). The same excavation case was also simulated by the Finite Difference Method (FDM) using M-C and D-P model to check their applicability. The excavation was 7.5 m in depth and was braced at the level of - 1.5 m. The results indicate that the DEM simulation can reproduce the main responses of granular ground during excavation; the excavation initiates failure at the excavation depth of 5.0m and evolves into total failure at the depth of 7.5 m; two types of stress paths in front of and behind the wall are observed, respectively; obvious principal stress rotations of soils are recognized. Compared with DEM results, M-C and D-P model can generally predict excavation responses qualitatively but under-estimate the ground deformation and internal forces of the wall. This is due to the incapability of the two continuum models to capture the mechanical behavior of granular material under complicated stress conditions in braced excavation. Based on these observations and comparisons, three features are emphasized for future continuum models: stress path dependency, non-coaxiality, and shear dilatancy.
机译：数值模拟已广泛用于支撑开挖设计。但是，先前的分析表明，由于对地面变形的预测不理想，因此需要进一步澄清普遍采用的本构模型，例如Mohr-Coulomb（M-C）模型和Drucker-Prager（D-P）模型。这项研究的重点是将来的连续介质模型应在粒状地面的支撑开挖中捕获的特征。为此，使用离散元方法（DEM）对简化的粒状地面支撑开挖进行了模拟。还使用M-C和D-P模型通过有限差分法（FDM）模拟了相同的开挖情况，以检查其适用性。开挖深度为7.5 m，支撑深度为-1.5 m。结果表明，DEM模拟可以再现基坑开挖过程中颗粒状地面的主要​​响应。开挖在开挖深度5.0m处引发破坏，并在开挖深度7.5m处演变为完全破坏。分别观察到墙体前后的两种应力路径；认识到土壤明显的主应力旋转。与DEM结果相比，M-C和D-P模型通常可以定性地预测开挖响应，但低估了墙体的地面变形和内力。这是由于两个连续模型无法在支撑开挖中捕获复杂应力条件下粒状材料的力学行为。基于这些观察和比较，未来的连续体模型强调了三个特征：应力路径依赖性，非同轴性和剪胀性。

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  • 来源
    《Granular matter》 |2013年第2期|195-208|共14页
  • 作者

    Mingjing Jiang; Zhifu Shen; Fangyuan Zhu;

  • 作者单位

    Department of Geotechnical Engineering and Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China;

    Department of Geotechnical Engineering and Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China;

    Department of Geotechnical Engineering and Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    braced excavation; distinct element method; constitutive model; stress path; stress rotation;

    机译：支撑开挖独特单元法本构模型;应力路径;应力旋转;

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