施有志, 林树枝, 赵花丽. 2016: 地铁深基坑开挖效应土体小应变参数敏感性分析--以厦门地区为例. 工程地质学报, 24(6): 1294-1301. DOI: 10.13544/j.cnki.jeg.2016.06.032
    引用本文: 施有志, 林树枝, 赵花丽. 2016: 地铁深基坑开挖效应土体小应变参数敏感性分析--以厦门地区为例. 工程地质学报, 24(6): 1294-1301. DOI: 10.13544/j.cnki.jeg.2016.06.032
    SHI Youzhi, LIN Shuzhi, ZHAO Huali. 2016: SOIL'S SMALL STRAIN PARAMETERS SENSITIVITY ANALYSIS OF METRO DEEP FOUNDATION PIT EXCAVATION EFFECT IN XIAMEN AREA. JOURNAL OF ENGINEERING GEOLOGY, 24(6): 1294-1301. DOI: 10.13544/j.cnki.jeg.2016.06.032
    Citation: SHI Youzhi, LIN Shuzhi, ZHAO Huali. 2016: SOIL'S SMALL STRAIN PARAMETERS SENSITIVITY ANALYSIS OF METRO DEEP FOUNDATION PIT EXCAVATION EFFECT IN XIAMEN AREA. JOURNAL OF ENGINEERING GEOLOGY, 24(6): 1294-1301. DOI: 10.13544/j.cnki.jeg.2016.06.032

    地铁深基坑开挖效应土体小应变参数敏感性分析--以厦门地区为例

    SOIL'S SMALL STRAIN PARAMETERS SENSITIVITY ANALYSIS OF METRO DEEP FOUNDATION PIT EXCAVATION EFFECT IN XIAMEN AREA

    • 摘要: 小应变硬化模型(HSS)可以同时考虑土体剪切硬化和压缩硬化,以及土体剪切模量在微小应变范围内随应变衰减的行为,因此在深基坑开挖数值分析中具有很好的适用性。为研究厦门地区土层HSS模型刚度参数E50refG0refγ0.7对深基坑数值分析结果的敏感性,基于敏感性分析和正交试验原理,选择厦门地区典型土层残积砂质黏性土、粉质黏土和淤泥质土,以坑外地表沉降值及围护墙的最大弯矩值作为控制指标,分别进行了单一控制土层的参数敏感性研究。结果表明:要在深基坑数值分析中精确计算地表沉降和围护墙弯矩,最重要是控制好土层G0ref的取值,其次是E50ref,而γ0.7的影响相对小一些;随开挖深度加深,G0ref对地表沉降的影响逐渐降低,E50refγ0.7的影响有所提高;E50ref对围护墙弯矩的影响随开挖进行有所降低,G0refγ0.7的影响则有增大趋势,其中G0ref相对较明显。土体小应变行为对于基坑施工效应有重要影响,在相关设计和施工中应予以重视。分析结果可为深基坑有限元分析中获得更合理的地层变形和结构内力响应提供有益参考。

       

      Abstract: Hardening soil small model (HSS) can consider not only soil shear and compression hardening, but also account for shear modulus attenuating in tiny strain range. Therefore, it has a good application for numerical analysis of excavations. To study the sensitivity of HSS model's stiffness parameters E50ref, G0ref and γ0.7 on the excavation's numerical analysis results in Xiamen area, based on sensitivity analysis theory and orthogonal experiment theory, representative residual sandy sticky clay, silty clay and mucky soil are chosen to serve as research objects, and take surface subsidence value of excavation and enclosure wall's maximum moment value as a control index. Single control on soil layer's parameters sensitivity study is applied respectively. The result shows that to calculate surface subsidence and enclosure wall's moment accurately in excavation numerical analysis. Firstly, control the value of soil's G0ref; secondly, E50ref impacts less than γ0.7; with the deepening of the excavation depth, the impact of G0ref for surface subsidence becomes less, while E50ref and γ0.7 impacts more; E50ref impacts less on enclosure wall's moment with the deepening of the excavation, while G0ref and γ0.7 tend to impact more, especially for G0ref. The results show that small strain behavior of soil is of great importance to excavation construction and deserves more attention in relevant design and construction. The analysis results could provide references for the acquirement of more reasonable stratum deformation and structure inner force in deep excavation finite element analysis.

       

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