PDF全文阅读

朱开宬^1，2，蔡   东³，许白杨³，罗   龙³，王   元³

 

 

（1.西华大学 建筑与土木工程学院，成都 610039；2.四川西星公路工程质量检测有限责任公司，成都611730；3.四川省交通建设集团有限责任公司，成都 610047）

 

 

摘要：为推广铁路隧道全断面装配式明洞结构，基于荷载-结构法分析明洞结构内力，结合装配式分块方法，对受力扰动较小的最小弯矩位置分块法与主动调整结构受力模式的最大弯矩分块法进行比较，建立螺栓-弹簧模型分析结构力学性能。结果表明:最大弯矩分块法的位移和应力高于最小弯矩分块法，安全系数略低于后者；接头数量的增加会导致明洞结构位移和应力增大，安全系数降低。其中，按照明洞结构最小弯矩位置进行分块设计，将边墙分为2块，全环共计6块，该方案位移与内力最小，安全系数最高，富余量达1.18。装配式明洞在减小对原有结构受力扰动的情况下，选择最小弯矩位置进行分块设计，在减少分块数量的同时降低对原结构受力的扰动，从而提高装配式明洞结构的安全性和稳定性。

关键词：铁路隧道；装配式明洞；设计选型；螺栓-弹簧模型；安全系数

中图分类号：U455.4

文献标志码：A

文章编号：1005-8249（2025）06-0109-08

DOI：10.19860/j.cnki.issn1005-8249.2025-06-019

 

 

 

ZHU Kaicheng^1,2,CAI Dong³,XU Baiyang³,LUO Long³,WANG Yuan³

 

 

(1.School of Architecture and Civil Engineering,Xihua University,Chengdu 610039,China；

 

2.Sichuan Xixing Highway Engineering Quality Inspection Co.,Ltd.,Chengdu 611730,China；

 

3.Sichuan Communications Construction Group Co.,Ltd.,Chengdu 610047,China）

 

Abstract：In order to promote the full-section assembled open-cut tunnel structure of railway tunnel,the internal force of the open-cut tunnel structure is analyzed based on the load-structure method.Combined with the assembled block method,the minimum bending moment position block method with less stress disturbance is compared with the maximum bending moment block method of actively adjusting the stress mode of the structure,and the bolt-spring model is established to analyze the mechanical properties of the structure.The results show that the displacement and stress of the maximum bending moment block method are higher than those of the minimum bending moment block method,and the safety factor is slightly lower than the latter.The increase of the number of joints will lead to the increase of the displacement and stress of the open-cut tunnel structure and the decrease of the safety factor.Among them,the third scheme is based on the minimum bending moment position of the open-cut tunnel structure,and the side wall is divided into 2 blocks,with a total of 6 blocks in the whole ring.The displacement and internal force of the scheme are the smallest,the safety factor is the highest,and the surplus amount is 1.18.In the case of reducing the disturbance to the original structure,the minimum bending moment position is selected for block design,which reduces the number of blocks and reduces the disturbance to the original structure,so as to improve the safety and stability of the assembled open-cut tunnel structure.

 

Key words：pipe jacking;soft soil subgrade;numerical simulation;bridge head jumping;gradual replacement method

 

作者简介：朱开宬(1996—)，男，硕士研究生，研究方向:隧道与地下空间。

通信作者：许白杨(1985—)，男，硕士，高级工程师，研究方向:路桥施工及管理。

收稿日期：2025-01-17