3D numerical analysis of immersed tunnels based on stratum-structure method
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摘要: 为分析沉管隧道的整体沉降以及接头张开、剪切变形等工程关注问题,重点研究了基于地层-结构法的沉管隧道建模方法,探讨了隧道初始地应力平衡、施工顺序的模拟、材料的本构模型以及接触关系的模拟等主要问题；通过建立港珠澳沉管隧道模型验证上述方法的可行性,并分析了初始地应力平衡的效果、隧道沉降变形以及接头相对变形,得到如下结论：①进行地应力平衡后的土体应力场与土层埋深近似成正比,位移场基本为0；②20 m回淤土荷载引起港珠澳沉管隧道最大沉降增量约为9.6 cm,航道处清淤会产生明显的回弹变形,对沉降变形的影响范围约超出清淤范围一个管节左右。Abstract: The 3D finite element modeling based on the stratum-structure method is highlighted to analyze the settlement of immersed tunnels and the opening displacement and shear deformation of joints. Several problems are discussed, such as the balance of the initial geostress, the simulation of the construction sequence, the constitutive model of the materials and the simulation of the contact relation. The feasibility of this method is verified through the project of Hong Kong-Zhuhai-Macao immersed tunnel. The balance effect of the initial geostress, the settlement of the whole tunnel and the relative displacements of the joints are studied. The following conclusions are drawn: (1) The soil stress is approximate in proportion to the burial depth, and the displacement is almost 0 after the balance of the initial geostress. (2) The maximum increment of the settlemnt of Hong Kong-Zhuhai-Macao immersed tunnel is about 9.6 cm when the back silting soil is 20 m in depth. The dredging under the ship lanes displays obvious resilience, and the sphere of influence is about 1 tube far.
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Keywords:
- immersed tunnel /
- stratum-structure method /
- FEM /
- initial geostress /
- settlement
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