摘要
在上海等超大城市的暗埋式轨道交通建设过程中,除了需要解决掘进本身所遇到的复杂的岩土工程外,还需要事先调查新建盾构隧道线路与既有建(构)筑设施的空间位置关系以便对既有建(构)筑物等基础设施进行搬迁、预加固或制定有针对性的保护方案。针对上海机场联络线设计盾构路由距离两侧桥梁基桩较近,施工风险大,需查明基桩实际桩侧位置的问题,本文采用测试孔水平位移测量、跨孔透射波法和旁孔弹性波反射法等相结合的技术方法,对盾构隧道邻近基桩水平变位进行试验研究,验证了旁孔弹性波反射法在基桩水平变位探测中具有一定的可行性。本文通过试验研究,基于旁孔弹性波反射法在不损坏桩体及上部结构的情况下,通过桩侧钻孔发射并接收记录桩侧反射波旅行时,进一步反演得到桩体侧壁的准确位置及形态。本次旁孔反射波法探测隧道盾构到1#桩桩侧的距离为0.58~0.60 m,到2#桩桩侧的距离为1.21~1.31 m,可以作为参考资料来保障盾构设计施工及高架道路的安全。实际探测结果表明,运用旁孔弹性波反射法探测基桩桩侧水平变位,在探测误差为10 cm的范围内,可以查明准确的基桩实际地下空间位置情况,为盾构设计施工提供参考资料。
In the construction process of underground rail transit in megacities like Shanghai,in addition to solving the complex geotechnical engineering encountered during tunneling,it is also necessary to investigate the spatial location relationship between the newly built shield tunnel route and existing buildings(structures)in advance in order to relocate,pre reinforce,or formulate targeted protection plans for existing buildings(structures)and other infrastructures.Given that the shield route designed for the connecting line of Shanghai Airport relatively close to the foundation piles of both sides of the bridge,and the construction risk is high,it is necessary to identify the actual pile side position of the foundation piles.In this paper,a combination of technical methods such as testing hole horizontal displacement measurement,cross hole transmission wave method,and side hole elastic wave reflection method are used to conduct experimental research on the horizontal displacement of the adjacent foundation piles of the shield tunnel.It is verified that the elastic wave reflection method through side holes is feasible in detecting horizontal displacement of foundation piles.Through experimental research,based on the elastic wave reflection method of the side hole,the accurate position and shape of the pile sidewall can be further inverted by transmitting and receiving the reflected wave travel time recorded through the pile side borehole without damaging the pile and the superstructure.The distance from the tunnel shield to the side of pile 1#is 0.58~0.60 m,and the distance to the side of pile 2#is 1.21~1.31 m using the side hole reflection wave method.This can be used as a reference material to ensure the safety of shield design,construction and elevated roads.The actual detection results indicate that using the side hole elastic wave reflection method to detect the horizontal displacement of the foundation pile side can accurately identify the actual underground space position of the foundation pile within the dete
作者
卢佳玉
王纲
王睿
毛柏杨
郭宏杰
郑晓雯
张学文
Lu Jiayu;Wang Gang;Wang Rui;Mao Baiyang;Guo Hongjie;Zheng Xiaowen;Zhang Xuewen(Shanghai Key Laboratory of Engineering Structure Safety,SRIBS,Shanghai 201108,China;Shanghai Donghua Local Railway Development Co.,Ltd.,Shanghai 200071,China)
出处
《工程地球物理学报》
2023年第6期762-772,共11页
Chinese Journal of Engineering Geophysics
基金
2020年上海市科委优秀技术带头人计划项目(编号:20XD1432400)
上海建科集团科研创新项目(编号:KY10000038.20210052)。
关键词
旁孔弹性波反射法
跨孔透射波法
土层速度测定
成孔检测
测斜
盾构施工安全
side-hole elastic wave reflection method
transhole transmission wave method
soil velocity measurement
hole forming inspection
inclination survey
shield construction safety
