軟土地區(qū)深基坑逆作法施工下立柱的豎向位移分析
王文燦1，仲曉梅1，詹學(xué)智2
- 摘 要
-
（1 天津城建學(xué)院土木工程系，天津 300384； 2 中鐵一局天津公司，天津 300250）［摘要］超深基坑在逆作法開挖過程中立柱的受力和變形異常復(fù)雜，而立柱之間的差異豎向位移過大會對作為永久結(jié)構(gòu)的水平梁板體系產(chǎn)生不利影響。某超深基坑蓋挖逆作盆式開挖過程中，選取具代表性的立柱進行監(jiān)測，對其豎向位移以及相鄰地下連續(xù)墻的豎向位移作對比分析。研究表明，立柱的上浮與土體開挖深度有關(guān)，開挖第三層土體時為立柱豎向位移的最不利狀態(tài)；中間立柱上浮量最大，向兩邊依次減小。［關(guān)鍵詞］軟土；超深基坑；逆作法；豎向位移；工程實測Analysis on-vertical displacement of pillars under top-down construction method in soft-soil areaWang Wencan1, Zhong Xiaomei1, Zhan Xuezhi2（1 Civil Engineering Department, Tianjin Institute of Urban Construction, Tianjin 300384, China；2 Tianjin Branch of China Railway First Group Co.,Ltd., Tianjin 300250,China)Abstract:The bearing capacity and deformation of pillars in super-deep foundation pit under top-down construction method are very complicated. If the differential vertical displacement between pillars is too large, it will exert an adverse impact on horizontal beam-slab structure which is taken as permanent construction. The analysis on monitoring data of vertical displacement of pillars and diaphragm walls was carried out under basin-excavation method in the excavation of super-deep foundation pit,considering the correlative factors which influence the vertical displacement of pillars. The results show that the ascents of pillars are in connection with the depth of excavation, excavation of the third layer is the most hazardous status, and the ascent of intermediary pillar is maximal, less in turns from middle to sideward.Keywords:soft soil; super-deep foundation pit; top-down construction method; vertical displacement; construction monitoring參考文獻［1］毛金萍,徐偉,呂鵬，等.深基坑立柱豎向位移分析［J］.建筑技術(shù),2004,35(5)：342-343.［2］陳立生.超深長條形基坑立柱上浮規(guī)律及其對鋼筋混凝土支撐附加彎矩的影響［J］.城市道橋與防洪，2008（8）：193-198.［3］DBJ08—61—1997基坑工程設(shè)計規(guī)程［S］.上海，1997．
