两车道公路黄土隧道变形规律

陈建勋; 王梦恕; 轩俊杰; 乔雄

doi:10.19818/j.cnki.1671-1637.2012.03.002

两车道公路黄土隧道变形规律

doi: 10.19818/j.cnki.1671-1637.2012.03.002

陈建勋^1,,
王梦恕²,
轩俊杰³,
乔雄^{1, 4}

1.
长安大学公路学院, 陕西西安 710064
2.
北京交通大学土木建筑工程学院, 北京 100044
3.
西北民族大学土木工程学院, 甘肃兰州 730030
4.
兰州理工大学土木工程学院, 甘肃兰州 730050

基金项目:

陕西省交通科技项目 08-06K

交通运输部科技项目 2010 353 361 310

详细信息

作者简介:
陈建勋(1969-), 男, 陕西韩城人, 长安大学教授, 工学博士, 从事隧道及地下工程研究

中图分类号: U451.2
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出版历程
- 收稿日期: 2012-01-12
- 刊出日期: 2012-06-25

Deformation rule of loess highway tunnel with two lanes

1.
School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China
2.
School of Civil Engineering and Architecture, Beijing Jiaotong University, Beijing 100044, China
3.
School of Civil Engineering, Northwest University for Nationalities, Lanzhou 730030, Gansu, China
4.
School of Civil Engineering, Lanzhou University of Technology, Lanzhou 730050, Gansu, China

More Information

Author Bio:
CHEN Jian-xun (1969-), male, professor, PhD, +86-29-82334887, chenjx1969@63.com

Article Text (Baidu Translation)

摘要

摘要: 依托国道主干线GZ35青岛至银川高速公路陕西境内吴堡至子洲沿线上7座单洞两车道分离式黄土隧道, 现场测试了隧道施工变形, 并对测试结果进行了回归分析。分析结果表明: 台阶法施工过程中黄土隧道拱部沉降远大于净空收敛; 黄土隧道变形大致经历了急剧变形阶段(开挖初期)、持续增长阶段与缓慢增长阶段; 黄土隧道的变形规律符合对数函数规律, 由于对数函数具有发散性, 故无法由此预估围岩的最终位移, 围岩变形将长期处于缓慢增长状态; 按照规范规定的最终速率值预估二次衬砌施作时机不符合工程实际要求, 不能保证隧道围岩和支护结构的稳定和施工安全, 因此, 在黄土隧道的施工中, 需要以控制拱部的沉降来控制隧道的变形。施工中必须秉承“快挖、快支、快封闭”的原则, 采取加强初期支护, 增设锁脚锚杆, 仰拱和二次衬砌边墙基础紧跟, 二次衬砌适时施作的措施, 避免拱部围岩发生过大的沉降, 确保隧道结构稳定。
- 隧道工程 /
- 黄土隧道 /
- 变形规律 /
- 监控量测 /
- 回归分析
Abstract: Relying on seven single-tunnel double-lane loess tunnels at Wubu to Zizhou section in Shaanxi Province on national main trunk line GZ35 from Qingdao to Yinchuan, the constructing deformations were messured by in-situ test method, and the regression analysis of test results was carried out.Analysis result shows that in the constructing process by using bench method, the arch settlements are far bigger than the clearance convergences.The tunnel deformation of surrounding rock experiences three stages: rapid deformation stage at the initial stage of excavation, sustainable growth stage and slow increasing stage.The deformation rule of loess tunnel accords with logarithmic distribution, but the logarithmic function is divergent, so the final displacement is not predicted.The deformation of surrounding rock is slowly increasing for a long time.It is not in accordance with the actual requirements and can not guarantee the stabilities of tunnel surrounding rock and supporting structure, and construction safety when the constructing time of secondary lining is estimated by using norms.So the deformation of tunnel should be controlled by using arch settlement in the constructing process of tunnel.The constructing principle of rapid excavating, rapid supporting and rapid closing is put forward for loess tunnel.Strengthening initial supporting, adding crus-locking anchors, quick constructing side walls and timely constructing secondary lining are carried out to avoid large settlement of arch surrounding rock and to ensure the stability of tunnel structure.
- tunnel engineering /
- loess tunnel /
- deformation rule /
- monitoring measurement /
- regression analysis

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图 1 分部开挖法施工步骤

1-拱部环形开挖; 2-拱部支护; 3-核心土及中槽开挖; 4-左边墙开挖; 5-左边墙支护; 6-右边墙开挖; 7-右边墙支护; 8-仰拱左幅开挖; 9-仰拱左幅支护; 10-仰拱左幅二衬施作; 11-仰拱右幅开挖; 12-仰拱右幅支护; 13-仰拱右幅二衬施作; 14-二衬施作

Figure 1. Construction steps of partial excavation method

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图 2 拱顶下沉量测方法

Figure 2. Test method of vault settlement

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图 3 监测项目横断面布置

Figure 3. Cross-section arrangement of the monitoring items

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图 4 张家沟隧道K41+065.5拱部沉降时态曲线

Figure 4. Arch settlement time curves of section K41+065.5 in Zhangjiagou Tunnel

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图 5 张家沟隧道K41+165净空收敛时态曲线

Figure 5. Clearance convergence time curves of section K41+165 in Zhangjiagou Tunnel

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图 6 刘家坪1号隧道YK49+315拱部沉降时态曲线

Figure 6. Arch settlement time curves of section YK49+315 in Liujiaping No.l Tunnel

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图 7 刘家坪1号隧道YK49+325净空收敛时态曲线

Figure 7. Clearance convergence time curves of section YK49+325 in Liujiaping No.l Tunnel

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图 8 刘家坪2号隧道YK49+670拱部沉降时态曲线

Figure 8. Arch settlement time curves of section YK49+670 in Liujiaping No.2Tunnel

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图 9 刘家坪2号隧道YK49+677净空收敛时态曲线

Figure 9. Clearance convergence time curves of section YK49+677 in Liujiaping No.2Tunnel

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表 1 隧道概况

Table 1. Tunnel situations

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表 2 隧道工程地质条件

Table 2. Engineering geological conditions of tunnels

表 3 隧道围岩变形结果

Table 3. Results of tunnel surrounding rock deformations mm

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表 4 隧道变形最终位移速率汇总

Table 4. Final displacement rate summary of tunnel deformation

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表 5 回归分析结果

Table 5. Regression analysis results

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表 6 二次衬砌预估施作时机

Table 6. Predictive construction time of secondary lining

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