| 干缩和徐变对隧道喷射混凝土支护安全的影响 |
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| 引用本文： | 李洪泉,;杨成永,;陆景慧. 干缩和徐变对隧道喷射混凝土支护安全的影响[J]. 北方交通大学学报, 2009, 0(4): 18-22 |
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| 作者姓名： | 李洪泉, 杨成永, 陆景慧 |
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| 作者单位： | [1]北京交通大学隧道与地下工程研究中心,北京100044; [2]北京市煤气热力工程设计院有限公司,北京100032 |
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| 基金项目： | 教育部留学归国人员科研启动基金资助（教外司留[2006]331号） |
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| 摘 要： | 针对以位移为基础的隧道支护结构安全性分析方法，探讨了喷射混凝土的收缩和徐变变形对隧道安全性的影响．根据喷射混凝土的干缩和徐变特性，推导了考虑干缩和徐变时支护内力的计算公式，给出了支护结构截面失效的功能函数，并进行了工程实例分析．结果表明，研究工作提高了施工期隧道喷射混凝土支护安全性评价位移方法的计算精度．
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| 关 键 词： | 干缩 徐变 喷混凝土支护 结构可靠度 位移方法 |
Influence of Shrinkage and Creep of Shotcrete on the Safety of the Primary Support of Tunnels |
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| Affiliation: | LI Hongquan, YANG Chengyong, LU Jinghui (1. Tunnel and Underground Engineering Research Center, Beijing Jiaotong University, Beijing 100044, China; 2. Beijing Gas and Heating Engineering Design Institute Co. Ltd., Beijing 100032, China) |
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| Abstract: | In terms of the displacement-based method previously proposed to evaluate the safety of tunnel support structures, the influence of shrinkage and creep of shotcrete on the stability of tunnels is explored. The properties of shotcrete in shrinkage and creep are discussed, and the formulas to calculate the internal forces of the shotcrete support with shrinkage and creep are derived. Then a performance function for the failure of a cross section is given. Finally, three engineering cases are performed. This research work can improve the accuracy of the displacement-based method. |
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| Keywords: | shrinkage creep shotcrete support structural reliability displacement-based method |
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