广州地铁西村站近接桩基沉降现场监测方法及其应用

以广州地铁西村站近接9组桩基施工为例,运用三维数值模拟技术,研究了近接桩基沉降现场监测方法,建立了西村站近接桩基沉降控制标准、监控量测管理等级和监控量测频率。对西村站9组近接桩基沉降现场监测值及计算值分析的结果表明:9组近接分区桩基沉降现场实测值与采取加固措施后的近接分区桩基沉降计算值基本一致,仅桩基X J27和X J31略有不同,现场实测值略大一些,桩基X J27由C区变为B区,桩基X J31由D区变为C区;桩基X J34沉降过大的原因主要是,加固措施的施工质量未达标以及开挖到桩基X J34相应位置时对围岩扰动过大;提出的广州地铁西村站近接桩基沉降现场监测方法是正确的。

Research on Field Monitoring Method and Application of Adjacent Pile Foundation Settlement in Xicun Station of Guangzhou Metro

Taking the nine groups of pile foundations located in the vicinity of Xicun Station of Guangzhou metro as an example,the field monitoring method of adjacent pile foundation settlement was studied by three-dimensional numerical analog analysis technique.And the settlement control standard,monitoring and measurement management level and frequencies of adjacent pile foundation in Xicun Station were established.The settlement field monitoring value and calculation value of nine groups of adjacent pile foundations in Xicun Station were analyzed.The results show that: the nine adjacent pile foundations settlement partition result from field monitoring va-lue is in substantial agreement with that from calculation value in the case of adopting reinforcement measures,only XJ27 and XJ31 pile foundations are somewhat different.XJ27 and XJ31 pile foundations field monitoring value slightly larger than calculation value in the case of adopting reinforcement measures.XJ27 pile foundation settlement partition result changes from C area to B area,and XJ31 pile foundation settlement partition result changes from D area to C area.The cause of XJ34 pile foundation settlement being too large mainly includes: the inferior quality of reinforcement measures,the excessive disturbance of surrounding rock by tunnel excavation and so on.The proposed field monitoring method for adjacent pile foundation settlement in Xicun Station of Guangzhou metro is right.