广州地铁西村站近接高架桥桩基影响分区及应用研究.doc

广州地铁西村站近接高架桥桩基影响分区及应用研究 王明年1，崔光耀1，喻 波2 (1. 西南交通大学土木工程学院，四川 成都 610031；2. 中国中铁二院工程集团有限责任公司，四川 成都 610031) 摘要：广州地铁西村站为暗挖法施工的隧道群，近接9组高架桥桩基，其中隧道与桩基XJ33最小净距仅2.30 m。为保证高架桥的使用安全性，采用有限差分法和最小二乘法原理，对近接高架桥桩基进行近接影响分区研究，并根据分区结果对桩基进行分类，确定各类桩基沉降集中区，并对其提出可靠的加固方案；同时建立西村站近接桩基监控等级等级中图分类号： 文献标识码：A 文章编号：INFLUENTIAL PARTITION AND APPLICATION OF ADJACENT VIADUCT PILE FOUNDATIONS IN XICUN STATION OF Guangzhou Metro WANG Mingnian1，CUI Guangyao1，YU Bo2 (1. School of Civil Engineering，Southwest Jiaotong University，Chengdu，Sichuan 610031，China；2. China Railway No.2 Engineering Group Co.，Ltd.，Chengdu，Sichuan 610031，China) Abstract： groups of viaduct pile foundations are located in the vicinity of Xicun station of Guangzhou metro which is constructed by subsurface excavation method. The minimum clear distance is 2.30 m between the tunnel of Xicun station and pile foundation XJ33. To ensure the use safety of the viaduct，the least squares principle and finite difference method are used study the influential partition of the pile foundations. The outcome of the influential partition is used for classification of pile foundations. And the concentrated areas of pile foundation settlement of the various types of pile foundations are determined. These results are applied to present the program of reinforcement and the management level of monitoring and measurement of the various types of pile foundations. The results show that the influential partition of the viaduct pile foundation is divided into four regions because of the tunnel excavation of Xicun station. Accordingly，the pile foundationdivided into four categories. The concentrated area of pile foundation settlement of pile type A is 2.0D(D is the diameter of tunnel) section before tunnel face and 3.0D section after tunnel face，1.0D section before tunnel face and 3.0D section after tunnel face for pile type B，and 0.5D section before tunnel face and 2.0D section after tunnel face for pile type C. Nine groups of viaduct pile foundations