| 特大断面隧道原位扩建中的扩挖方案比选研究 |
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| 引用本文： | 林嗣雄.特大断面隧道原位扩建中的扩挖方案比选研究[J].路基工程,2017,0(5):183-187. |
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| 作者姓名： | 林嗣雄 |
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| 作者单位： | 福州市规划设计研究院, 福州 350108 |
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| 摘 要： | 以金鸡山特大断面隧道原位扩建工程为背景，分别对传统中隔壁法扩挖方案和核心五步法扩挖方案进行精细化数值模拟，重点关注围岩压力、支护弯矩和洞身收敛随施工过程的动态变化。从施工效率上看，核心五步法扩挖方案由于简化了开挖分区，其施工步由传统中隔壁法的144步减少到124步。从围岩压力和初支弯矩上看，核心五步法扩挖方案中围岩压力的偏压状况得到明显缓解，初支弯矩分布更加均匀，且正负弯矩绝对值较小。从洞身收敛上看，两种扩挖方案相差不大。建议金鸡山隧道原位扩建工程采用核心五步法扩挖方案，能加快施工进度、减小围岩扰动、提高施工安全性。
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| 关 键 词： | 特大断面隧道 原位扩建 扩挖方案 传统中隔壁法 核心五步法 |
| 收稿时间： | 2019-11-10 |
Comparison of Expanding Excavation Schemes for In-situ Reconstruction of Super-large Section Tunnel |
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| Abstract: | Taking the in-situ reconstruction of super-large section tunnel at Jinji Mountain as the background, for the expanding excavation schemes based on traditional center diaphragm method or core five-step method respectively, elaborate numerical simulation was carried out, with the emphasis laid on how the pressure of surrounding rock, the bending moment of support, and the convergence of tunnel trunk change with the construction. The scheme based on core five-step method, from the viewpoint of construction efficiency, due to its simplified excavation zone, has the reduced 124 steps for construction from 144 steps in traditional center diaphragm method; from the pressure of surrounding rock and the bending moment of initial support, the unsymmetrical pressure of the rock in this scheme was relieved significantly, and the distribution of initial support’s bending moment was more even with small absolute value of positive and negative bending moment; from the convergence of tunnel trunk, the both schemes has little difference. Above all, it is advised to use the scheme based on core five-step method for the reconstruction of super-large section tunnel at Jinji Mountain. |
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