摘要
在城市地铁隧道施工中常会遇到新建隧道下方穿越已建隧道的情况,提前预测已建隧道沉降是工程实施的关键。本文提出了刚度修正简易计算方法,利用隧道与土体纵向相对刚度,以土体自由变形为基础,建立了已建隧道沉降曲线的沉降槽宽度修正系数和地层损失率修正系数,借此预测已建隧道的沉降发展;并利用数值模拟方法建立了相对刚度与各修正系数的定量关系,实现了刚度修正法的工程应用。然后将刚度修正法计算结果与基于弹性地基梁的解析方法进行了对比,验证了本文方法的可行性和有效性。最后,给出了刚度修正法在工程实例中的应用案例。
In urban subway tunnel construction,situations often arise where a newly constructed tunnel in-tersects with an existing tunnel.Accurate prediction of the settlement of the existing tunnel is crucial for suc-cessful project implementation.In this paper,a simplified stiffness correction method is proposed.Based on the longitudinal relative stiffness between the tunnel and the surrounding soil,the settlement trough width correction coefficient and ground loss ratio correction coefficient of the existing tunnel settlement curve are established to predict settlement development.Additionally,numerical simulation method is used to obtain the quantitative re-lationship between relative stiffness and each correction coefficient,facilitating practical engineering applica-tion.Then,the results from the stiffness correction method are compared with those from an analytical method based on an elastic foundation beam to validate the feasibility and effectiveness of the proposed method.At last,an application of the stiffness correction method is presented in a case study.
作者
宗翔
Zong Xiang(Shanghai Municipal Engineering Design Institute(Group)Co,Ltd.,200092,China)
出处
《特种结构》
2024年第3期14-19,35,共7页
Special Structures
关键词
刚度修正法
纵向相对刚度
已建隧道
盾构隧道
Stiffness correction method
Longitudinal relative stiffness
Existing tunnel
Shield tunneling
