| 盾构法隧道施工阶段管片的力学分析 |
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| 引用本文： | 宋克志,袁大军,王梦恕.盾构法隧道施工阶段管片的力学分析[J].岩土力学,2008,29(3):619-623. |
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| 作者姓名： | 宋克志 袁大军 王梦恕 |
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| 作者单位： | 1. 鲁东大学,土木工程学院,烟台,264025
2. 北京交通大学,隧道及地下工程试验研究中心,北京,100044 |
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| 摘 要： | 盾构隧道衬砌管片在施工阶段处于复杂的受力状态,易出现局部破损现象.阐明了盾构施工阶段管片的受力特点,对其常见的局部破损现象及产生原因进行了总结与分析,在此基础上构建了施工阶段的管片力学模型,即一端固定、一端简支的受力构件.以某盾构工程施工参数为例,运用有限元方法实现该力学模型,按不同工况对其进行了数值模拟,并与现场实测结果进行了对比分析.研究表明:盾构施工阶段,衬砌管片会在第5～7环之间产生局部破损,与现场出现的管片破损部位十分接近;千斤顶推力的大小、倾角及偏差是导致施工阶段管片局部破损的主要原因,并给出了盾构施工阶段减轻管片破损的一些建议.
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| 关 键 词： | 盾构隧道 管片破损 施工阶段 力学模型 千斤顶推力 有限元 盾构法隧道 施工阶段 管片破损 力学分析 stage during construction tunnel shield 偏差 倾角 大小 顶推力 衬砌管片 研究 实测结果 数值模拟 工况 有限元方法 运用 施工参数 |
| 文章编号： | 1000-7598-(2008)03-0619-06 |
| 收稿时间： | 2006-04-30 |
| 修稿时间： | 2006年4月30日 |
Segmental mechanical analysis of shield tunnel during construction stage |
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| SONG Ke-zhi,YUAN Da-jun,WANG Meng-shu.Segmental mechanical analysis of shield tunnel during construction stage[J].Rock and Soil Mechanics,2008,29(3):619-623. |
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| Authors: | SONG Ke-zhi YUAN Da-jun WANG Meng-shu |
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| Institution: | 1. College of Civil Engineering, Ludong University, Yantai 264025, China; 2. Research Center of Tunneling and Underground Works, Beijing Jiaotong University, Beijing 100044, China |
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| Abstract: | During shield construction there are many segmental partial ruptures caused by construction factors which is already confirmed by engineering practices. The segmental mechanical characteristics during construction stage are presented firstly; and then common local ruptures of segment concrete are summarized; and leading causes are analyzed. And based on which mechanical model for construction stage is developed. The model can be described as a fixed-simple component which one end is anchored by clotted grout and the other end is supported by shield sealing brushes. In order to study the segment mechanical properties, a shield tunnel as an example is analyzed; and several cases are simulated by FEM; then comparison between FEM results and field measurement values is made. Study has manifested that most segmental ruptures are located at the fifth ring to the seventh ring which is approximately same to in-situ rupture position of segment. In addition, thrust force and its obliquity and partial difference are the main causes leading to segmental rupture. Finally, some items are suggested to lighten local ruptures of segment during shield construction stage. |
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| Keywords: | shield tunnel segment damage construction stage mechanical model cylinder thrust force finite elements |
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