不同掘进工法下软岩中深埋小净距隧道变形规律研究

贾锋; 杜永强; 杨文波; 聂金诚; 寇昊; 肖龙鸽

doi:10.13204/j.gyjzG22091803

不同掘进工法下软岩中深埋小净距隧道变形规律研究

doi: 10.13204/j.gyjzG22091803

1. 中国建设基础设施有限公司, 北京 100044;
2. 中建隧道建设有限公司, 重庆 401320;
3. 西南交通大学交通隧道工程教育部重点实验室, 成都 610031;
4. 中国建筑股份有限公司, 北京 100037

基金项目:

中建股份科技研发计划资助项目(CSCEC-2021-Z-26)。

详细信息

作者简介:
贾锋,男,1979年出生,博士,教授级高级工程师,1152834287@qq.com。

通讯作者:
杨文波,男,1985年出生,博士,教授,yangwenbo1179@hotmail.com。

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出版历程
- 收稿日期: 2022-09-18

Research on Deformation Laws of Deeply Buried Tunnels with Small Clearance in Soft Rock by Different Tunnelling Methods

1. China Construction Infrastructure Co., Ltd., Beijing 100044, China;
2. China Construction Tunnel Co., Ltd., Chongqing 401320, China;
3. Key Laboratory of Transportation Tunnel Engineering of Ministry of Education, Southwest Jiaotong University, Chengdu 610031, China;
4. China State Construction Engineering Corporation, Beijing 100037, China

摘要

摘要: 为探究软岩中深埋条件下小净距隧道左、右隧道掘进的相互扰动影响,依托华丽高速东马场1号隧道工程,通过对现场实测数据的分析及数值模拟,对软岩中深埋小净距隧道左、右隧道采用不同掘进工法和掌子面间距掘进时隧道的变形规律展开研究。结果表明:掘进时,左、右隧道存在相互扰动现象,先行隧道水平收敛变形明显大于后行隧道;掘进工法对隧道变形影响较大,双隧道均采用三台阶掘进,相较采用两台阶掘进的变形量最大减小13%;先行隧道采用三台阶掘进,后行隧道采用两台阶掘进的变形量相较双隧道均采用两台阶掘进最大减小12%,与双隧道均采用三台阶掘进的变形结果相近;左、右隧道掌子面间距对拱顶沉降影响较小,而对隧道水平收敛变形影响较大,随着掌子面间距的增大,变形稳定时间延长,水平位移逐渐减小,且在间距达到50 m后变形减小趋势变缓。综合考虑隧道施工工期、建设成本及隧道变形控制效果,建议软岩中深埋小净距隧道采用先行隧道三台阶掘进、后行隧道采用两台阶掘进的施工方案,将掌子面间距控制在50 m以上,以减小两隧道的相互扰动。
- 公路隧道 /
- 变形规律 /
- 数值模拟 /
- 小净距 /
- 深埋隧道 /
- 软岩
Abstract: To explore the mutual disturbance effect due to tunnelling of deeply buried the left and right tunnels with small clearance in soft rock, based on tunnel 1 of Dongmachang in Huali High-Speed Project, through field measured data analysis and numerical simulations, the deformation laws of tunnels with small clearance by dififerenent tunnelling methods for the and left and right tunnels in different clearances between working faces in deeply soft rock were studied. The results indicated that there was mutual disturbance between the left and right tunnels during tunnelling and the horizontal convergent deformation of the tunnel first was obviously larger than that of the tunnel later. The tunnelling method had a great influence on the deformation of tunnels, and the deformation by the three-step tunnelling for both double tunnels was 13% less than that by the two-step tunnelling. The deformation by the three-step tunnelling for the tunnel first and the two-step tunnelling for the tunnel later decreased by 12% than that by the three-step tunnelling for both tunnels, which was similar to that by the three-step tunnelling for both tunnels. The clearance between the left and right tunnels had a little influence on the settlement of the vault, but had a great influence on the horizontal convergence deformation of tunnels. With the increase of the clearance between working faces of the left and right tunnels, the time for deformation stability prolonged, the horizontal displacement gradually decreased, and the deformation decreased slowly when the clearance was up to 50 m. Comprehensively considering the construction period, construction cost and tunnel deformation control effect, the scheme for the tunnel first by the three-step tunnelling and the tunnel later by two-step tunnelling was suggested to tunnels with small clearance in deeply soft rock.If the clearance between working faces could be controlled beyond 50 m,the mutual disturbance between the both tunnels would be reduced.
- highway tunnel /
- deformation law /
- numerical simulation /
- small clearance /
- deeply buried tunnel /
- soft rock

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参考文献(18)

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