| 偏压分岔隧道施工过程损伤破坏分析与优化研究 |
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| 引用本文： | 王汉鹏,李术才,郑学芬.偏压分岔隧道施工过程损伤破坏分析与优化研究[J].岩土力学,2009,30(6):1705-1710. |
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| 作者姓名： | 王汉鹏 李术才 郑学芬 |
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| 作者单位： | 1. 山东大学 岩土与结构研究中心，济南 250061；2. 山东城市建设职业学院，济南 250014 |
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| 基金项目： | 国家杰出青年科学基金(A类)，中国博士后科学基金，山东省博士后创新项目 |
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| 摘 要： | 正在施工的沪蓉西高速公路八字岭分岔隧道属于偏压隧道，而且分岔隧道包括连拱段和小净距段，施工过程转换复杂，因此，采用正确的施工方案对于隧道的稳定性非常重要。为更真实地模拟岩体的力学特性，研究施工过程中岩体的损伤破坏，根据不可逆热力学理论建立了弹塑性损伤耦合模型，并编制了三维弹塑性损伤有限元程序D-FEM。建立了分岔隧道大型三维数值模型，采用弹塑性损伤有限元D-FEM模拟了分岔隧道不同的施工过程，通过分析施工过程中隧道围岩的位移、应力和损伤屈服区，最终确定采用左洞超前右洞32 m，左右洞同步开挖的施工方法。
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| 关 键 词： | 偏压 分岔隧道 施工过程优化 弹塑性损伤 有限元 |
| 收稿时间： | 2007-10-08 |
Damage analysis and optimum research on construction process for forked tunnel under bias pressure |
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| WANG Han-peng,LI Shu-cai,ZHENG Xue-fen.Damage analysis and optimum research on construction process for forked tunnel under bias pressure[J].Rock and Soil Mechanics,2009,30(6):1705-1710. |
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| Authors: | WANG Han-peng LI Shu-cai ZHENG Xue-fen |
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| Institution: | 1. Research Center of Geotechnical and Structural Engineering, Shandong University, Ji’nan 250061, China; 2. Shandong Urban Construction Vocational College, Ji’nan 250014 China |
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| Abstract: | Baziling forked tunnel along Shanghai-Chengdu Expressway in construction is an unsymmetrically loaded tunnel. Construction process of forked tunnel is very complex because the forked tunnel includes twin-bore section and small clear spacing section. So, it’s important for forked tunnel to adopt appropriate construction process. In order to simulate rock mass properties veritably and analyze damage failure of rock in construction, the coupling model of elastoplastic damage is presented based on irreversible thermodynamics theory. 3D elastoplastic damage finite element code D-FEM is programmed by FORTRAN language. A large 3D numerical model of forked tunnel is set up and different construction processes are simulated by D-FEM. Through analyzing displacement, stress and damage yield zone of tunnel surrounding, the optimum construction process that left tunnel excavates ahead of right tunnel 32 m is determined, left tunnel and right tunnel excavate synchronously is proposed. |
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| Keywords: | bias pressure forked tunnel construction process optimization elastoplastic damage finite elements |
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