A complete case of a deep excavation was explored. According to the practical working conditions, a 3D non-linear finite element procedure is used to simulate a deep excavation supported by the composite soil nailed w...A complete case of a deep excavation was explored. According to the practical working conditions, a 3D non-linear finite element procedure is used to simulate a deep excavation supported by the composite soil nailed wall with bored piles in soft soil. The modified cam clay model is employed as the constitutive relationship of the soil in the numerical simulation. Results from the numerical analysis are fitted well with the field data, which indicate that the research approach used is reliable. Based on the field data and numerical results of the deep excavation supported by four different patterns of the composite soil nailed wall, the significant corner effect is founded in the 3D deep excavation. If bored piles or soil anchors are considered in the composite soil nailed wall, they are beneficial to decreasing deformations and internal forces of bored piles, cement mixing piles, soil anchors, soil nailings and soil around the deep excavation. Besides, the effects due to bored piles are more significant than those deduced from soil anchors. All mentioned above prove that the composite soil nailed wall with bored piles is feasible in the deep excavation.展开更多
以北京某典型的桩锚-土钉组合支护为例,采用国际通用岩土工程软件FLAC(fast Lagrangian analysis of continua)-2D,对桩锚复合土钉支护中土钉的内力及变化规律进行了研究,并和现场实测结果进行了比较.实测数据与规范、数值模拟结果的对...以北京某典型的桩锚-土钉组合支护为例,采用国际通用岩土工程软件FLAC(fast Lagrangian analysis of continua)-2D,对桩锚复合土钉支护中土钉的内力及变化规律进行了研究,并和现场实测结果进行了比较.实测数据与规范、数值模拟结果的对比分析表明,桩锚复合土钉支护土钉的受力略小于同样条件下纯土钉墙支护土钉的受力;土钉内力变化规律与土钉墙支护土钉内力变化基本一致;桩锚复合土钉支护土钉部分的破裂面与规范破裂面在底部差异较大.探讨了现有复合土钉支护计算方法的不足,同时也表明了用FLAC软件进行复合土钉支护土钉内力分析和优化设计,可以得到较好的结果.展开更多
基金Foundation item： Project（2009-K3-2） supported by the Ministry of Housing and Urban-Rural Development of China
文摘A complete case of a deep excavation was explored. According to the practical working conditions, a 3D non-linear finite element procedure is used to simulate a deep excavation supported by the composite soil nailed wall with bored piles in soft soil. The modified cam clay model is employed as the constitutive relationship of the soil in the numerical simulation. Results from the numerical analysis are fitted well with the field data, which indicate that the research approach used is reliable. Based on the field data and numerical results of the deep excavation supported by four different patterns of the composite soil nailed wall, the significant corner effect is founded in the 3D deep excavation. If bored piles or soil anchors are considered in the composite soil nailed wall, they are beneficial to decreasing deformations and internal forces of bored piles, cement mixing piles, soil anchors, soil nailings and soil around the deep excavation. Besides, the effects due to bored piles are more significant than those deduced from soil anchors. All mentioned above prove that the composite soil nailed wall with bored piles is feasible in the deep excavation.
文摘以北京某典型的桩锚-土钉组合支护为例,采用国际通用岩土工程软件FLAC(fast Lagrangian analysis of continua)-2D,对桩锚复合土钉支护中土钉的内力及变化规律进行了研究,并和现场实测结果进行了比较.实测数据与规范、数值模拟结果的对比分析表明,桩锚复合土钉支护土钉的受力略小于同样条件下纯土钉墙支护土钉的受力;土钉内力变化规律与土钉墙支护土钉内力变化基本一致;桩锚复合土钉支护土钉部分的破裂面与规范破裂面在底部差异较大.探讨了现有复合土钉支护计算方法的不足,同时也表明了用FLAC软件进行复合土钉支护土钉内力分析和优化设计,可以得到较好的结果.
