暗挖隧道下穿跨河桥部分桥桩的影响分析及对策——以北京地铁14号线北工大站—平乐园站区间为例

发布时间：2018-01-09 11:08

本文关键词：暗挖隧道下穿跨河桥部分桥桩的影响分析及对策——以北京地铁14号线北工大站—平乐园站区间为例　出处：《隧道建设》2015年07期 　论文类型：期刊论文

【摘要】：为研究在不降水情况下暗挖隧道下穿跨河桥桥桩的影响并确定设计与施工方案,以北京地铁14号线北工大站—平乐园站区间(以下简称北—平区间)为例,根据暗挖隧道下穿桥桩后结构变形特点建立有限元模型,进行计算分析后进一步细化设计方案(暗挖断面架设临时仰拱);采用全断面深孔注浆对土体进行预加固,同时兼做堵水措施。施工过程中对桥桩变形进行全过程监测,并与有限元模型计算结果进行对比。目前该隧道已经通过竣工验收,桥梁结构稳定,最终变形收敛至稳定值。结果表明:暗挖隧道通过架设临时仰拱+注浆堵水下穿桥桩是可行的;有限元模型可预测隧道下穿桥桩的变形,可为今后类似工程提供参考。
[Abstract]:In order to study the influence of the bridge pile through the river bridge in the case of no precipitation, and to determine the design and construction scheme, take the example of Beijing Metro Line 14 between Bei Gong Da Station and Ping Le Yuan Station (hereinafter referred to as Bei-Ping Section). The finite element model is established according to the deformation characteristics of the pile behind the bridge under the excavation tunnel, and the design scheme is further refined after the calculation and analysis (erection of temporary inverted arch in the subsurface excavation section); The full-section deep hole grouting is used to pre-reinforce the soil and the water plugging measures are also used to monitor the deformation of the bridge pile during the construction process. And compared with the results of finite element model, the tunnel has been completed and accepted, and the bridge structure is stable. Finally, the deformation converges to a stable value. The results show that it is feasible to build a tunnel with temporary inverted arch grouting to plug the water. The finite element model can predict the deformation of the bridge pile under the tunnel and provide reference for similar projects in the future.
【作者单位】：广州地铁设计研究院有限公司;北京建工土木工程有限公司;北京城建设计发展集团股份有限公司;
【分类号】：U455.4
【正文快照】： 0引言伴随着国内地铁事业的蓬勃发展,地铁区间的施工环境越来越复杂,各种下穿、侧穿桥桩、房屋等障碍物的工程实例越来越多,设计方案与施工方案也逐渐多样化[1-12]。文献[3-4]分析了盾构法隧道下穿人行天桥、通车桥桥桩的变形及应对措施;文献[5]基于浅埋暗挖隧道施工引起地表

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