高速公路隧道施工全过程三维弹塑性数值模拟
3D Elasto-plastic Numerical Simulation of Entire Construction Process for H ighway Tunnel
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摘要: 为了获得开挖过程中隧道结构体应力、应变和位移规律,以渝黔二期笔架山隧道北端洞口段实态建模, 采用有限元程序对施工全过程进行了三维弹塑性数值模拟,并与现场实测数据进行了比较.研究结果表明,开挖 对围岩影响较大的范围在开挖面四周5 m以内,且上台阶开挖的影响大于下台阶开挖;围岩沉降和水平位移在 开挖前已完成1/3;围岩塑性区位于开挖面前1. 5 m范围内,锚杆主要受本施工段上台阶开挖的影响.Abstract: In order to obtain the regularities of stress, strain and displacement of tunnel structures during excavation, the northern end ofBijiashan tunnel in the 2nd stageYu-Qian projectwasmodeled and its construction process was numerically simulated with 3D elasto-plastic finite elementmethod (FEM). Comparison between simulated and in-situ tested results shows that the range with a great influence of tunnel excavating on surrounding rock is5m around an excavation face, excavation of the upperbench has a greater effect than that of the lower bench, and one-third of total settlement and horizontal displacement of surrounding rock has generated before excavating. In addition, the plastic zone in surrounding rock ranges 1. 5 m in the front of an excavating face, and rock bolts are mainly influenced by the excavation of the upperbench in the current construction step.
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Key words:
- tunnel /
- soft rock /
- elasto-plasticity /
- 3D FEM /
- in-situ test
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