摘要
拟建的上海市轨道交通11号线区间盾构隧道近距离下穿交大海洋重点工程实验室群桩基础。通过采用莫尔-库仑弹塑性屈服准则,建立有限元数值模型。依据数值模拟结果,先施工左侧隧道与先施工右侧隧道对于桩基础的沉降影响不大;在右侧隧道施工后,隧道埋深处桩体的竖直应力变化最大,最大值为367 kPa,桩体水平应力在与隧道同一深度处变化较大,最大值为9.6 kPa;单桩的最大差异沉降为6.8 mm,按照桩基设计规范,不需要采取加固措施减便可确保建筑物基础的安全可靠;地表的最大沉降值为18.6 mm;由于双线隧道的运营导致的地面附加沉降为1.5 mm。
The interval shield tunnel of Urban transit line 11 in Shanghai is situated closely under the group piles of the National Key Laboratory for Ocean Engineering of Shanghai Jiaotong University. By using Mohr-Coulomb yield criterion the numerical model is established, in this paper the following results are obtained： constructing the left tunnel or the right tunnel first has not much difference on settlement of piles ; After the construction of right tunnel, vertical stress difference of piles at the depth, where tunnel lays, gets the maximum value of 367kPa, and the horizontal stress difference of piles at the depth reaches the maximum value 9.6kPa, the maximal differential settlements of poles is 6.8mm, according to the standard of piles design, it is not necessary to take consolidation measures to assure the safety of the buildings;the maximal settlement value of ground surface is 18.6mm; the additional settlement caused by running of the tunnels is 1 .5mm.
出处
《地下空间与工程学报》
CSCD
2006年第4期561-565,共5页
Chinese Journal of Underground Space and Engineering
基金
中国博士后科学基金资助项目(2005037150)
关键词
盾构隧道
桩基础
数值分析
差异沉降
shield tunnels
piles
numerical analysis
differential settlement
