Numerical analysis of moisture, thermal and mechanical states for subway double-line tunnel constructed by artificial freezing method
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摘要: 为了准确分析地铁隧道人工冻结施工过程中的热力学状况, 考虑水分迁移和冰水相变耦合影响以及水泥水化热的生成, 采用热蠕变本构建立了地铁隧道人工冻结施工的水热力耦合分析模型。对广州地铁某双线隧道施工过程中的热力状况进行了数值模拟, 同时应用人工冻土的长期强度对冻结壁安全性进行了评估。分析结果表明: 在地铁冻结法施工时, 最大主应力沿着冻结管呈环形分布, 并且管周围的应力明显偏高; 开挖对环形应力场的影响不大, 而且与其他施工方法不同, 人工冻结法施工引起的地表沉降并不随开挖断面的逐渐扩大而增大, 整个施工过程中的最大地表沉量仅为9.1mm, 因而人工冻结法施工能有效地控制地表沉降量。Abstract: In order to accurately analyze the thermal and mechanical states of subway tunnel constructed by artificial freezing method, the coupled effects of moisture transfer and phase change of ice and water, the generation of cement hydration heat and thermal creep constitutive relationship were taken into account, and a moisture, thermal and mechanical coupled model was established. The thermal and mechanical states of Guangzhou subway double-line tunnel constructed by artificial freezing method were simulated, and the safety of frozen wall was evaluated by using the long-term strength of frozen soil. Analysis result shows that the maximum principal stress distributes circularly along freezing pipes when the subway tunnel is constructed by artificial freezing method, and the stress around freezing pipes is obviously high. Excavation has little influence on circular stress field, the surface settlement caused by artificial freezing construction doesn't increase with excavation expansion, which is different from other construction methods. The maximum settlement is only 9.1 mm during the whole construction, so the surface settlement can be effectively controlled by artificial freezing method.
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Key words:
- tunnel engineering /
- double-line tunnel /
- artificial freezing method /
- numerical analysis
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图 5 冻土融化后衬砌的最大主应力
Figure 5. Maximum principal stresses of linings after frozen wall thaw
表 1 热力学参数
Table 1. Thermal and mechanical parameters
物理量 ρ/(kg·m-3) λf/λu/(J·h-1·m-1·℃-1) Cf/Cu/(J·kg-1·℃-1) Ef/Eu/MPa vf/vu φf/φu cf/cu/kPa αT/℃-1 a1/% b1 D/(m2·s-1) 人工填土 1 850 3 738/3 323 1 860/2 280 /10 /0.42 /18 /20 1.32×10-5 2.043 0.349 3.4×10-9 粉质粘土 1 910 7 632/5 112 1 130/1 390 /12 /0.40 30/20 300/20 9.50×10-6 10.217 0.242 6.6×10-9 砂质粘土 1 900 9 406/6 300 1 160/1 430 /20 /0.30 /28 /19 2.08×10-5 2.513 0.581 8.7×10-9 
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表 2 水泥的水化热
Table 2. Hydration heat of cement
龄期/d 3 7 28 qv/(kJ·m-3) 3.625×105 3.930×105 4.843×105
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