上软下硬地层中双侧壁导坑法中隔壁改进研究
摘要：为充分利用青岛地区上软下硬地层中相对较好的地质条件,对双侧壁导坑法进行了改进。改进工法将开挖导坑减少到6个,缩短了工期。同时,实现了“以锚代撑”,减少了支撑用量。改进工法使中隔壁落于下部坚硬岩层上,并打设锁脚锚杆,下部岩体采用放坡开挖,并保留岩肩以保证中隔壁受力稳定。为了验证改进工法的可行性与安全性,对现场实测数据进行了详细分析。结果表明:地表沉降随隧道开挖过程逐渐增大,最大值为-43.49mm;拱顶沉降和净空收敛最大值分别为-18.61mm和-17.76mm。监测数据均未超过施工警戒值,施工过程安全,从而达到减少工序转换、降低支撑费用的目的。
关键词：地铁车站双侧壁导坑法中隔壁上软下硬地层监测数据分析
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[4] 王梦恕.地下工程浅埋暗挖技术通论[M].合肥:安徽教育出版社,2005.
[5] 王梦恕.隧道工程浅埋暗挖法施工要点(续前)[J].隧道建设,2006,26(6):3-6.
[6] 王梦恕.隧道工程浅埋暗挖法施工要点(续完)[J].隧道建设,2007,27(1):1-2.
[7] 李浩,韩立军,孟庆彬,等.V级围岩二车道隧道双侧壁导坑法优化分析[J].现代隧道技术,2015,52(6):118-125.
[8] 田利锋.复杂环境下地铁暗挖车站双侧壁导坑法支撑体系优化[J].铁道标准设计,2016,60(7):130-133.
[9] 刘昆赟,吴永军,杨元洪.大跨度偏压隧道双侧壁导坑法施工方案的优化及效果分析[J].林业建设,2014 (1):45-50.
[10] 吴绍升.大跨度超浅埋隧道特殊地质下双侧壁导坑施工工法的优化与施工[J].铁道建筑技术,2015 (5):84-86.
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[12] 肖营,胡伦炜.大跨径隧道双上侧壁导坑法施工技术[J].施工技术,2011,40(7):61-63.
[13] 杨永波,刘明贵,张国华,等.临近既有隧道的新建大断面隧道施工参数优化分析[J],岩土力学,2010,31(4):1217-1226.
[14] XIE Xiongyao,YANG Yubing,JI Mei.Analysis of ground surface settlement induced by the construction of a large-diameter shield-driven tunnel in Shanghai,China [J].Tunnelling and underground space technology,2016,51:120-132.
Improvement of Center Diaphragm with Double Sidewall Guiding Pit Method in Upper Soft and Lower Hard Strata
Abstract: In order to make full use of the relatively good geological conditions in the upper soft and lower hard strata in Qingdao area, the construction method of double sidewall pilot tunnel is improved. The optimized method decreases the number of pilot tunnels to 6, which simplifies construction steps and shortens the construction period; meanwhile, it replaces support with bolt and reduces the support usage. The improved construction method enables the center diaphragm to fall on the lower hard rock layer, and a locking bolt is installed. The lower rock layer is excavated by slope, and the rock shoulder is retained to stabilize the stress of the center diaphragm. In order to verify the feasibility and safety of the improved construction method, the field monitoring data are analyzed in detail. The results show that the surface settlement gradually increases with the tunnel excavation process, and the maximum value is-43.49 mm. The maximum vault settlement and clearance convergence are-18.61 mm and-17.76 mm respectively. The monitoring data do not exceed the construction alarm value, and the construction process is safe. Therefore, the purpose of reducing process conversion and cost is achieved.
Keywords: subway stations; double sidewall guiding pit method; center diaphragm; upper-soft and lower-hard strata; monitoring; data analysis
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