摘要
采用三维数值模拟结果与现场实测数据相互印证,研究了基于渗流应力耦合的双线盾构掘进过程中桩基变形规律和桩身结构受力特征,并探讨了侧穿桥桩的保护措施及加固效果。结果表明:富水砂卵石地层中研究盾构穿越桩基工程时考虑渗流应力耦合使计算结果精度提高;盾构侧穿诱发桩基变形主要影响范围在距桩前后各10环管片宽度,桩身最大水平位移、最大弯矩和轴力均出现在隧道拱顶同一埋深位置,而桩端竖向位移最大,桩基在竖向上两端受压变形;采用袖阀管地面预注浆和洞内半环注浆加固条件下桩身水平位移、竖向位移、桩身轴力、桩身弯矩分别减小了79.4%,80.5%,70%,67%。
The deformation law of pile foundation and the stress characteristics of pile body structure in the process of double-line shield tunneling based on seepage stress coupling are studied by using threedimensional numerical simulation results and field measured data,and the protection measures and reinforcement effects of side-crossing bridge piles are discussed.The results show that the accuracy of the calculation results is improved by considering the coupling of seepage stress in the study of shield crossing pile foundation engineering in water-rich sandy cobble stratum.The main influence range of pile foundation deformation induced by shield side crossing is the width of 10 ring segments before and after the pile.The maximum horizontal displacement,maximum bending moment and axial force of the pile body appear at the same buried depth of the tunnel vault,while the vertical displacement of the pile end is the largest,and the pile foundation is compressed and deformed at both ends in the vertical direction.The horizontal displacement,vertical displacement,axial force and bending moment of the pile body are reduced by 79.4%,80.5%,70%and 67%respectively under the condition of ground pre-grouting with oil valve pipe and semi-ring grouting in the tunnel.
作者
王富林
杨扬
杨黎明
WANG Fulin;YANG Yang;YANG Liming(Guangxi Liuwu Railway Co.,Ltd.,Nanning,Guangxi 530025,China;China Construction Railway Investment South China Construction Co.,Ltd.,Guangzhou,Guangdong 510670,China;China Construction Third Engineering Group Co.,Ltd.,Wuhan,Huebei 430064,China)
出处
《施工技术(中英文)》
2025年第10期87-94,共8页
Construction Technology
关键词
地铁
盾构
桩基
渗流应力耦合
数值模拟
控制措施
subways
shields
pile foundation
seepage stress coupling
simulation
control measures
