| 渝怀铁路彭水隧道出口大跨段施工方案的数值分析 |
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| 引用本文： | 雷升祥,周晓军.渝怀铁路彭水隧道出口大跨段施工方案的数值分析[J].地下空间与工程学报,2002,22(3):191-196. |
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| 作者姓名： | 雷升祥 周晓军 |
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| 作者单位： | 1. 中铁十八局集团公司,天津,300222
2. 西南交通大学土木工程学院,成都,610031 |
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| 摘 要： | 对渝怀铁路彭水隧道出口段大跨度隧道 ,采用中壁法和下导坑超前台阶法两种不同施工方法开挖过程的二维有限元计算 ,对比分析了两种开挖方式下引起的地层沉降、隧道围岩塑性区、隧道衬砌内力以及拱顶下沉的变化特点 ,结果得出采用下导坑超前台阶法施工要比中壁法安全 ,因此该大垮度隧道宜采用下导坑超前台阶法施工。
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| 关 键 词： | 大跨度隧道 中壁法 下导坑超前台阶法 地层沉降 塑性区 |
| 文章编号： | 1001-831X(2002)03--191-06 |
| 修稿时间： | 2002年5月22日 |
Numerical Analysis of the Construction Scheme for Large-span Exit Section of the Pengshui Tunnel in Chongqing-Huaihua Railway |
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| LEI Sheng,xiang et al..Numerical Analysis of the Construction Scheme for Large-span Exit Section of the Pengshui Tunnel in Chongqing-Huaihua Railway[J].Chinese Journal of Underground Space and Engineering,2002,22(3):191-196. |
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| Authors: | LEI Sheng xiang |
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| Affiliation: | LEI Sheng xiang et al. |
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| Abstract: | Two dimensional finite element computation is performed to simulate the driving process of large span exit section of Pengshui Tunnel in Yuhai Railway by means of Center Diaphragms (CD) and Bottom Drift with Upper Annular Benching (BDUAB) method. The comparison of varying features of ground subsidence, plastic zone in surrounding soil and roof settlement of tunnel lining induced by construction of the large span exit between the two tunneling methods has been carried out. The obtained results show that the adoption of BDUAB method is much more safe and rational than the CD method to excavate the exit section of Pengshui tunnel. Therefore, the BDUAB method is highly recommended to excavate the exit section of the tunnel. |
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| Keywords: | large span tunnel center diaphragm method bottom drift with upper annular benching method ground subsidence plastic zone |
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