上软下硬地层浅埋大跨度车站拆撑安全性分析

发布时间：2018-05-09 04:19

本文选题：拆撑 + 现场实测　；参考：《岩土力学》2014年S1期

【摘要】：对于复合式衬砌隧道,初支受力最危险的时期就是为保证二次衬砌的完整性而分段拆除临时支撑的阶段。依托青岛地铁某暗挖车站,采用现场实测数据分析和数值模拟相结合的方法,对比拆撑前后围岩与初支变形情况,进而对6 m范围内交替拆撑,并以6 m为工作单元间隔拆撑的拆撑方案安全性进行分析。实测数据表明,地表沉降、拱顶沉降及净空收敛在拆撑前后增长量及影响均较小,数值计算结果与实测数据吻合较好,可知初支的安全性受支撑拆除的影响较小。研究结论为实现信息化施工提供了依据,也为今后类似工程积累了相关经验。
[Abstract]:For composite lining tunnel, the most dangerous period of initial support force is the stage of sublevel removal of temporary support in order to ensure the integrity of secondary lining. Based on a underground excavation station of Qingdao Metro, the deformation of surrounding rock and initial support before and after bracing is compared by using the method of field measured data analysis and numerical simulation, and then the bracing is removed alternately within 6 m range. The security of the support removal scheme with 6 m work unit interval is analyzed. The measured data show that the increase and influence of surface settlement, vault settlement and clearance convergence before and after bracing are small, and the numerical results are in good agreement with the measured data. It can be seen that the security of the initial support is less affected by the removal of braces. The conclusion provides the basis for information construction and accumulates relevant experience for similar projects in the future.
【作者单位】：中国海洋大学环境科学与工程学院;青岛地铁集团有限公司;
【基金】：国家自然科学基金资助(No.41202204) 同济大学岩土及地下工程教育部重点实验室开放研究基金资助(No.KLE-TJGE-B1107) 青岛市地铁公司科研课题资助(No.SDSITC-0198710)
【分类号】：U455;U231.3

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