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中南大学学报(自然科学版)

Journal of Central South University

第49卷    第7期    总第287期    2018年7月

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文章编号:1672-7207(2018)07-1775-09
地面堆载引起下卧盾构隧道剪切错台变形计算研究
魏纲1,俞国骅2,洪文强3

(1. 浙江大学城市学院 土木工程系,浙江 杭州,310015;
2. 安徽理工大学 土木建筑学院,安徽 淮南,232001;
3. 浙江大学 岩土工程研究所,浙江 杭州,310058
)

摘 要: 采用Boussinesq公式求解得到地面堆载工况下隧道轴线处的土体附加应力;基于剪切错台模型,运用最小势能原理计算得到下卧地铁盾构隧道的纵向位移以及相邻盾构衬砌环之间的错台量和环间剪切力。通过算例分析,研究堆载面荷载q、堆载偏移距离s、隧道上部覆土厚度h以及堆载尺寸B和L对隧道纵向位移的影响。研究结果表明:q越大,盾构隧道的沉降量就越大,但隧道沉降影响范围并没有增大;随着s增大,隧道沉降量越来越小且沉降量减小的速率加快,隧道的水平位移则先增大后减小;随着h增加,隧道最大沉降减小,同时隧道沉降影响范围加大;B的改变对隧道竖向位移影响非常小,L的改变对隧道沉降量及范围的影响较大;隧道的竖向位移要明显大于隧道的水平位移。

 

关键词: 地面堆载;盾构隧道;剪切错台;隧道纵向位移

Study on calculation of shield tunnel shearing dislocation platform deformation due to adjacent ground stacked load
WEI Gang1, YU Guohua2, HONG Wenqiang3

1. Department of Civil Engineering, Zhejiang University City College, Hangzhou 310015, China;
2. Department of Civil Engineering and Architecture, Anhui University of Science and Technology, Huainan 232001, China;
3. Institute of Geotechnical Engineering, Zhejiang University, Hangzhou 310058, China

Abstract:The additional stress on the axis of shield tunnel was calculated by using the Boussinesq formula due to the adjacent ground stacked load. Then with the shearing dislocation platform model the vertical displacement, the dislocation of adjacent segments and the interannular shearing force of the subway shield tunnel in the sub-layer were calculated. In addition, an example analysis was made to study the influence on value of ground stacked load q, the offset distance of the ground stacked load s, the thickness of covering soil upon the shield tunnel h and the shield tunnel and the size of ground stacked load B and L. The results show that the bigger the numerical value of stacked load q is, the bigger the settlement of the shield tunnel is, but the influence range of the shield tunnel’s settlement does not become bigger. The bigger the distance between the shield tunnel and the center of the ground stacked load is, the smaller the settlement of the shield tunnel is, and the shrinking speed of the settlement is bigger. As the offset distance s becomes bigger, the horizontal displacement of shield tunnel increases first and then shrinks. The thicker the covering soil is, the smaller the maximum settlement of the shield tunnel is, but the influence range of settlement of shield tunnel is bigger. The change of length of ground stacked load has a bigger influence on the settlement of the shield tunnel. The settlement of the shield tunnel is bigger than its horizontal displacement.

 

Key words: ground stacked load; shield tunnel; shearing dislocation platform; longitudinal displacement

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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