- 摘 要
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(廣東省建筑設計研究院，廣州510010)
［提要］廣州地鐵五號線大坦沙站工程處于石灰?guī)r地區(qū)，巖溶發(fā)育、連通，巖面以上全為軟土層，地下工程施工風險極大。設計采用靈活布置的深層攪拌樁，既加固了基坑被動區(qū)，又降低了坑底突水的風險，同時提高了地基承載力。并提出了防止止水帷幕薄弱處滲流的措施和樁基穿越溶洞的方法，實施效果好。考慮水土壓力的地下結構整體模型的有限元分析，較為真實地反映了實際受力狀態(tài)。屋面采用由三角桁架與弧形剛架組成的鋼結構屋面，輕巧、美觀。
［關鍵詞］基坑支護；地基加固；溶洞處理；整體計算；鋼桁架
Structural Design of Datansha Station of Guangzhou No.5 Metro Line/Zhou Peihuan, Chen Yingrong(The Architectural Design and Research Institute of Gangdong Province, Guangzhou 510010， China)
Abstract:The project is located in limestone area where karst is developed and intercommunicated, and the soil above the rock are all mollisol, so the construction risk is extremely high. The design adopted flexible layout of deep-mixing piles is introduced, which could strengthen the passive zone, reduce the risk of seepage and piping in the pit and increase the bearing capacity of the foundation. The measures to avoid seepage in unsubstantial zone of seepproof screen and the treatment for piles penetrating caves are mentioned. The analysis of integral underground model in which the water and soil pressures are both involved, which can accurately reflect the practical mechanical behaviors, the design of steel roof consisting of triangle truss and arc frame are also introduced.
Keywords: supporting; foundation strengthen; karst cave treatment; integral analysis; steel sunshade
