| 楼岱.基于tij本构模型类矩形土压平衡盾构隧道施工环境影响数值分析研究[J].安徽建筑大学学报,2022,30(): |
| 基于tij本构模型类矩形土压平衡盾构隧道施工环境影响数值分析研究 |
| Numerical Analysis of Environmental Impact based on tij Constitutive Model during Construction of Quas-rectangular Shield |
| 投稿时间：2021-12-16 修订日期：2022-01-04 |
| DOI： |
| 中文关键词: 类矩形盾构 tij本构模型 隔离桩 数值模拟 桩基变形 |
| 英文关键词: quasi-rectangle shield tij constitutive model isolation pile numerical simulation pile foundation deformation |
| 基金项目:宁波市重大科技攻关资助项目(No.2015C110017) |
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| 中文摘要: |
| 以类矩形盾构隧道和宁波淤泥质粘土为研究对象,现场钻取宁波地区高灵敏度淤泥质黏土,对采取的土样开展标准固结试验和三轴压缩试验,得到了淤泥质黏土的物理力学指标。采用Subloading Tij有限元计算软件对试验得出的土体参数进行模拟,确定了有限元计算用土体物理力学参数。建立类矩形盾构隧道施工环境影响的有限元计算分析模型,对采用不同本构模型变形计算、隧道施工应力释放率影响、隧道掘进对不同桩长、不同近接程度的邻近建筑物影响以及设置隔离桩减小环境影响进行了研究。结果表明,采用tij本构模型弹塑性水土耦合分析,较准确模拟宁波高灵敏度淤泥质黏土性质。隧道施工应力释放率为10%时,接近实际施工工况。对不同应力释放率,地表沉降值与应力释放率呈近似指数型变化关系。隧道施工对不同桩底埋深的邻近建筑物影响不同,对于桩底位于隧道的侧上方,施工环境影响最大。采用隔离桩措施进行加固,邻近建筑物桩底埋深大于隧道底时,加固效果不明显,桩底埋深小于隧道底时,加固效果较明显,现场应重视短桩基础结构的邻近建筑物。 |
| 英文摘要: |
| Taking quasi-rectangle shield and Ningbo silty clay as the research objects, the high-sensitivity silty clay in Ningbo area was drilled on site, and the soil samples were subjected to conventional consolidation tests and triaxial compression tests to obtain the physical mechanics of the silty clay. index. The Subloading Tij finite element calculation software was used to simulate the soil parameters obtained from the test, and the physical and mechanical parameters of the soil for finite element calculation were determined. Establish a finite element calculation and analysis model for the impact of quasi-rectangle shield construction on the environment, and use different constitutive models to analyze the deformation, the impact of the tunnel construction stress release rate, the impact of tunnel excavation on adjacent buildings with different pile lengths and different degrees of proximity, and the installation of isolation Pile reduction of environmental impact was studied. The results show that the elastoplastic water-soil coupling analysis using the tij constitutive model can more accurately simulate the properties of Ningbo"s high-sensitivity silty clay. When the stress release rate of the tunnel construction is 10%, it is close to the actual construction conditions. For different stress release rates, the relationship between the surface settlement value and the stress release rate is approximately exponential. Tunnel construction has different impacts on neighboring buildings with different buried depths of pile bottoms. For pile bottoms located above the side of the tunnel, the construction environment has the greatest impact. Isolation piles are used for reinforcement. When the buried depth of the pile bottom of the adjacent building is greater than the tunnel bottom, the reinforcement effect is not obvious. When the buried depth of the pile bottom is less than the tunnel bottom, the reinforcement effect is more obvious. The site should pay attention to the adjacent buildings with short pile foundation structure. |
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