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《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

卷:

39卷

期数:

2022年05期

页码:

262-273

栏目:

基础工程

出版日期:

2022-09-30

文章信息/Info

Title:

Development and Technical Research of New Prefabricated Temporary Support Structure for Tunnel

文章编号:

1673-2049(2022)05-0262-12

作者:

骆维斌^1,2,乔 雄³,倪伟淋³,刘文高³,田过勤^1,2,黄锦聪³

(1. 甘肃路桥建设集团有限公司,甘肃 兰州 730030; 2. 甘肃省隧道工程技术研究中心,甘肃 兰州 730030; 3. 兰州理工大学 土木工程学院,甘肃 兰州 730050)

Author(s):

LUO Wei-bin^1,2, QIAO Xiong³, NI Wei-lin³, LIU Wen-gao³, TIAN Guo-qin^1,2, HUANG Jin-cong³

(1. Gansu Road & Bridge Construction Group, Lanzhou 730030, Gansu, China; 2. Gansu Tunnel Engineering Technology Research Center, Lanzhou 730030, Gansu, China; 3. School of Civil Engineering, Lanzhou University of Technology, Lanzhou 730050, Gansu, China)

关键词:

隧道施工;  临时支撑;  装配式结构;  数值模拟

Keywords:

tunnel construction;  temporary support;  prefabricated structure;  numerical simulation

分类号:

TU94

DOI:

10.19815/j.jace.2022.03095

文献标志码:

A

摘要:

针对目前隧道传统临时支撑的不足,自主研发设计了一种全装配式竖直临时支撑结构,该结构采用预制装配式模块+现场拼装的方式进行施工。分别对该支护结构的横向支撑杆件及连接方式、挡土板及连接方式和顶部连接方式做了4种不同方案进行比选,最终分别采用水平板状横向支撑+插销式连接、挡板+T形插销式连接和顶部的螺栓连接。以桑园子隧道为背景,采用MIDAS/GTS数值模拟软件,对比分析了分部开挖施工中采用传统弧形支撑和新型竖直临时支撑的隧道围岩位移及支护结构力学特征,并结合现场实测数据对模拟结果进行验证。结果表明:从最终位移可以看出,两种临时支撑结构下拱顶和左、右边墙处围岩的变形近似相同,竖直临时支撑隧道围岩的拱顶以及左、右拱腰处的沉降相对弧形临时支撑较均匀,对隧道拱底变形的控制效果也更明显,且弧形临时支撑结构总变形量比竖直临时支撑大2.17倍; 对比力学特征可知,竖直临时支撑参与的受力效果较好,其最大压应力为弧形支撑的29.88倍,从而减少了隧道拱顶和拱底的应力; 对临时支撑24步开挖的变形进行分析得到,前20步开挖竖直临时支撑变形略大于弧形临时支撑,21步开始时弧形临时支撑变形迅速增大,导致施工段21～24步弧形临时支撑变形量均大于竖直临时支撑,说明竖直临时支撑结构自稳性更好,装配式临时支撑结构采用竖直形状更优,能满足隧道侧壁导坑法施工要求。

Abstract:

Aiming at the shortcomings of the current traditional temporary support of tunnels, a fully assembled vertical temporary support structure was independently developed and designed, which adopted the method of prefabricated modules + on-site assembly for construction. Four different schemes were compared and selected for the lateral support member and connection method, retaining plate and connection method, and top connection method of the supporting structure. Finally, horizontal plate lateral support + pin connection, baffle + T pin connection and bolt connection at the top were adopted respectively.Taking the Sangyuanzi tunnel as the background, the MIDAS/GTS numerical simulation software was used to compare and analyze the displacement of surrounding rock and the mechanical characteristics of the supporting structure of the tunnel using traditional arc support and new vertical temporary support in the part-step excavation construction. The measured data validated the simulation results. The results show that from the final displacement, it can be seen that the deformation of the vault under the two temporary support structures and the surrounding rock on the left and right walls are approximately the same. Compared with the arc temporary support, the settlement of the tunnel arch and the left and right arch waists with vertical temporary support is more uniform, and the control effect on the deformation of the tunnel arch bottom is also more obvious. The total deformation of the arc temporary support structure is 2.17 times larger than that of the vertical temporary support. Comparing the mechanical characteristics, it can be seen that the force effect of the vertical temporary support is better, and the maximum compressive stress is 29.88 times larger than that of the arc, thereby reducing the stress of the tunnel vault and vault bottom. Analysis of the displacement of the temporary support 24-step excavation shows that the vertical temporary support displacement of the first 20 steps of excavation is slightly larger than that of the arc temporary support. From step 21 to step 24, the displacement of the arc-shaped temporary support is larger than that of the vertical temporary support, indicating that the vertical temporary support structure has better self-stability, and the prefabricated temporary support structure adopts vertical shape is better, which can meet the construction requirements of the tunnel side heading method.

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备注/Memo

备注/Memo:

收稿日期:2022-03-12
基金项目:国家自然科学基金项目(51768041); 交通运输行业重点科技项目(2019-MS2-048)
作者简介:骆维斌(1980-),男,甘肃漳县人,高级工程师,工学硕士,E-mail:1130784037@qq.com。
通信作者:乔 雄(1980-),男,陕西榆林人,副教授,工学博士,E-mail:qiaoxiong@lut.edu.cn。

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更新日期/Last Update: 2022-09-30