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现代隧道技术 2017, Vol. 54 Issue (3) :82-89    DOI:
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“土-岩” 复合地层盾构始发井横通道开挖支护力学行为研究
(北京工业大学城市与工程安全减灾教育部重点实验室, 北京 100124)
Analysis of Mechanical Behaviors during Shield Launching Shaft Cross Passage Construction in Soil/Rock Mixed Ground
(Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education, Beijing University of Technology, Beijing 100124)
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摘要 结合长春地区特殊的 “土-岩” 复合地质情况, 文章首先通过对横通道施工阶段地表及洞内沉降监测进行数据分析, 总结出 CRD工法施工过程中土层的沉降变形规律; 然后采用有限元软件 MIDAS/GTS分析横通道施工引起支护结构和上覆埋地管线的变形及受力情况, 并与实测数据进行对比分析。结果表明:(1) 1~4号导洞开挖对地表沉降贡献较大, 占总沉降的74%;(2) 掌子面开挖的影响范围约为其前后15 m;(3) 初期支护中拱顶及底部仰拱Mises应力较大, 且初期支护交接处均出现应力集中;(4) 管线中部Mises应力最大, 在距离中轴线约10 m的位置出现应力最低点。
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Abstract: Facing the special "soil/rock" mixed ground condition in the Changchun area, the monitoring data of ground surface settlement and the convergence deformation during cross-passage construction were analyzed, and the settlement and deformation laws were obtained during the construction process using the CRD method. Then, a numerical simulation was conducted using MIDAS/GTS finite-element software to study the settlement, deformation and mechanical behaviors of the support structure and buried pipelines during cross-passage excavation. After a comparison with the measured data, some results were determined: 1) ground surface subsidence induced by the excavation of pilot tunnels 1~4 accounts for 74% of the total settlement; 2) the influence scope caused by tunnel face excavation is around 15 m ahead of and behind the face; 3) the Mises stress in the vault and invert of the primary support structure is high, and the stress concentration emerges at the junction of the primary support structure; and 4) the maximum Mises stress is in the middle of the pipelines with the lowest stress point being about 10 m away from the axis of the pipeline.
KeywordsCross-passage,   CRD method,   Ground surface settlement,   Underground pipeline     
基金资助:

基金项目: 国家自然科学基金资助项目( 51278017); 北京市属高等学校人才强教项目国外访学项目(067135300100).

作者简介: 作者简介: 王兆辉(1986-), 男, 硕士研究生, 主要从事地下工程施工方面的研究工作, E-mail: wangzhaohui_5333@126.com. 通讯作者: 李立云(1973-), 男, 副教授, 主要从事岩土及地下工程防灾减灾方面的研究工作,E-mail: llyun5921@163.com
引用本文:   
.“土-岩” 复合地层盾构始发井横通道开挖支护力学行为研究[J]  现代隧道技术, 2017,V54(3): 82-89
.Analysis of Mechanical Behaviors during Shield Launching Shaft Cross Passage Construction in Soil/Rock Mixed Ground[J]  , 2017,V54(3): 82-89
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