大直径盾构隧道施工对高层建筑及桩基影响数值分析

发布时间：2018-01-08 09:03

本文关键词：大直径盾构隧道施工对高层建筑及桩基影响数值分析　出处：《太原理工大学学报》2017年05期 　论文类型：期刊论文

【摘要】：根据某在建大直径盾构在软弱地层邻接桩基高层建筑的施工工况,建立三维数值模型进行分析,通过与现场实测数据进行对比,验证了模型的合理性;并讨论了盾构侧穿和下穿不同桩长的桩基时建筑沉降及桩体变形差异。研究表明,盾构下穿桩基施工时,建筑沉降是否大于相同工况下的自由地表沉降,主要取决于盾构施工上部塌落拱与桩群的相交范围,相交范围较大时,建筑沉降大于相同工况下的自由地表沉降;盾构"邻接"侧穿桩基施工时,建筑及桩体的响应与桩长有密切关系。当桩端位于隧道水平轴线以上时,受隧道施工影响较小;当桩端位于隧道水平轴线所在位置时,桩体水平位移和弯矩较大;当桩端位于隧道水平轴线以下时,上部建筑表现为较为明显的水平位移和倾斜。
[Abstract]:According to some in the construction of large diameter shield in soft stratum adjacent pile foundation construction conditions of high-rise building, the establishment of three-dimensional numerical model analysis, by comparing with the measured data, verify the rationality of the model; and discusses the shield side wear and wear under different pile length of pile construction settlement and pile deformation. The results show that the difference the pile foundation construction of shield, wear, building settlement is greater than the same condition of free surface subsidence, mainly depends on the shield construction of upper arch collapse and intersection of pile group, the intersection range is very large, the building settlement is greater than the same condition of free surface subsidence; shield "adjacent" side in pile foundation construction, building and pile the response is closely related with the pile length. When the pile is located above the tunnel horizontal axis, affected by the tunnel construction; when the pile in the tunnel horizontal axis position, the pile body horizontal position When the end of the pile is below the horizontal axis of the tunnel, the upper building shows a more obvious horizontal displacement and inclination when the end of the pile is below the horizontal axis of the tunnel.

【作者单位】：山西省交通科学研究院;
【基金】：山西省交通科技基金资助项目(2015-1-18)
【分类号】：U455.43
【正文快照】： 盾构工法因具有施工安全、掘进快速等诸多优势,广泛应用于国内外大直径隧道工程的建设。如东京湾海底隧道、狮子洋隧道、南京纬三路过江通道、上海长江隧道等均采用大直径盾构进行修建[1-4]。由于城市建筑密集,地下空间开发力度正在逐步加大,大直径盾构隧道近距离穿越桩基高层

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