通过三维弹塑性有限元模型的建立，探讨软土地区盾构隧道开挖对地表沉降及上部桩基工作性状的影响规律。结果表明：地表沉降随盾构隧道开挖深度的增大而减小，而发生地表沉降范围增大；当桩体位于隧道拱顶正上方时，桩端与隧道拱顶间的最小安全距离为0.5d(d为隧道直径)；盾构隧道开挖在其侧上方引起的影响区为距离隧道中心线1d的范围。
Abstract
A 3D elasto plastic finite element model was established, and a detailed discussion was made on the influence caused by tunneling to ground settlement and superpile. The results showed that the ground settlement which occurs in larger scope would reduce with the increasing of shield tunnel excavation depth. If the pile existed just at the upside of shield tunnel crown, the minimum safe distance between pile toe and shield tunnel crown would be half tunnel diameter. The lateral up influenced zone due to tunneling was one tunnel diameter from tunnel centerline.
{{custom_sec.title}}
{{custom_sec.title}}
{{custom_sec.content}}
参考文献
[1]杨晓杰,邓飞皇,聂雯,等. 地铁隧道近距离穿越施工对桩基承载力的影响研究[J]. 岩石力学与工程学报,2006,25(6):1290-1295.
[2]Morton J D, King K H. Effects of tunneling on the bearing capacity and settlement of piled foundations[G]//Proceedings, Tunneling 79. London: IMM, 1979.
[3]Ong C W, Leung C F, Yong K Y, et al. Centrifuge modeling of pile responses due to tunneling in clay[J]. Underground Singapore, 2005, 128(4): 327-336.
[4]杨平,朱逢斌. 城市隧道施工对邻近单桩工作性状影响研究[J]. 现代隧道技术,2006,11(增):234-239.
[5]朱逢斌,杨平,Ong C W. 盾构隧道开挖对邻近桩基影响数值分析[J]. 岩土工程学报,2008,30(2):298-302.
[6]Gordon T K, Ng C W W. Effects of advancing open face tunneling on an existing loaded pile[J]. J Geotech Geoenviron Eng, ASCE, 2005, 131(2):193-201.
[7]Jacobsz S W, Standing J R, Mair R J. Centrifuge modeling of tunneling near driven piles[C]//Geotechnical Aspects of Underground Construction in Soft Ground. France, 2002.
基金
收稿日期：2009-02-17修回日期：2009-04-20基金项目：江苏省 “青蓝工程”中青年学术带头人培养计划(2004)作者简介：朱逢斌(1981—)，讲师，硕士。*杨平(通讯作者)，教授，研究方向为环境岩土与地下工程。Email: yangping@njfu.com.cn。引文格式：朱逢斌,杨平,佘才高. 城市地铁隧道对结构物上部桩基的影响[J]. 南京林业大学学报:自然科学版,2009,33(6):108-112.
