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

卷:

42卷

期数:

2025年06期

页码:

124-139

栏目:

桥隧工程

出版日期:

2025-11-25

文章信息/Info

Title:

Study on bearing characteristics of composite semi-curved wall of shallow buried double-arch tunnel in sand stratum

文章编号:

1673-2049(2025)06-0124-16

作者:

魏进¹,王微笑¹,卞海丁¹,张巍²,王朋路²,冯畅²,温涵^1,3

(1. 长安大学 公路学院,陕西 西安 710064; 2. 西安市市政建设(集团)有限公司,陕西 西安 710054; 3. 平顶山发展投资控股集团有限公司,河南 平顶山 467000)

Author(s):

WEI Jin¹, WANG Weixiao¹, BIAN Haiding¹, ZHANG Wei², WANG Penglu², FENG Chang², WEN Han^1,3

(1. School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China; 2. Xi'an Municipal Construction(Group)Co., Ltd., Xi'an 710054, Shaanxi, China; 3. Pingdingshan Development Investment Holding Co., Ltd., Pingdingshan 467000, Henan, China)

关键词:

隧道工程;  连拱隧道;  中隔墙;  半曲形式;  承载特性;  现场监测;  数值模拟

Keywords:

tunnel engineering;  double-arch tunnel;  middle partition wall;  semi-curved form;  bearing characteristic;  filed monitoring;  numerical simulation

分类号:

U455

DOI:

10.19815/j.jace.2024.07096

文献标志码:

A

摘要:

为研究浅埋暗挖连拱隧道复合式半曲中隔墙的承载特性,依托西安市建元路-开元路通道工程,通过现场试验研究了半曲墙在开挖过程中底部与顶部压力、主筋轴力、弯矩、墙身沉降的演化规律,在验证模型有效性的基础上,采用数值模拟的方法进一步研究了两侧不同填料高度与不同开挖工法下中隔墙的位移变化规律。结果表明:中隔墙顶部和底部压力呈现两端大、中间小的现象,基底压力大于顶部压力; 中隔墙左侧主筋轴力大于右侧,将轴力值带入内力计算公式得到中隔墙不同截面处的弯矩,轴力、弯矩分布特征均为中部最大、底部次之、顶部最小,中部横截面为受力最不利位置,且在左洞施工时墙身弯距较大,右洞开挖后,围岩压力的释放起到了一定的纠偏作用; 墙身顶部向左洞偏移,墙底向右洞偏移,呈现出逆时针偏转的趋势,因此在中隔墙施工完成后,主洞开挖前应考虑采取两侧回填或增加横向支撑的防护措施; 对于土质松软的砂土地层,可采用中隔墙两侧不回填及开挖断面较小的三台阶法施工,能够减小中隔墙的竖向位移; 研究成果可为砂土地层浅埋暗挖连拱隧道的设计与施工提供参考。

Abstract:

In order to study the bearing characteristics of the composite semi-curved wall of shallow buried double-arch tunnel, the evolution law of the bottom and top pressure, axial force of the main reinforcement, bending moment and wall body settlement of the semi-curved wall during the excavation process was studied through field test based on the Jianyuan Road-Kaiyuan Road tunnel project in Xi'an City. The displacement variation law of the middle partition wall under different filling height and excavation method on both sides was further studied by numerical simulation. The results show that the pressure at the top and bottom of the middle partition wall is large at both ends and small in the middle, and the base pressure is larger than the top pressure. The axial force of the main reinforcement on the left side of the middle partition wall is greater than that on the right side, and the bending moment at different sections of the middle partition wall can be obtained by inserting the axial force value into the internal force calculation formula. The distribution characteristics of axial force and bending moment are the largest in the middle, the second at the bottom and the smallest at the top. The middle section is the most unfavorable position under stress. The deflection distance of the wall is larger in the construction of the left hole. After the excavation of the right hole, the release of surrounding rock pressure plays a certain role in correcting the deviation. The top of the wall body is offset to the left hole, and the bottom of the wall is offset to the right hole, showing a trend of counter clockwise deflection. Therefore, after the construction of the middle partition wall is completed, the protective measures of backfilling on both sides or increasing the transverse support should be considered before the excavation of the main hole. For the soft sandy soil stratum, the three-step method with not backfilling on both sides of the middle partition wall and small excavation section can be adopted, which can reduce the vertical displacement of the middle partition wall. The research results can provide reference for the design and construction of shallow buried double-arch tunnel in sand stratum.

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备注/Memo

备注/Memo:

收稿日期:2024-07-23
基金项目:陕西省建设科技计划项目(2022-K53)
作者简介:魏 进(1972-),男,工学博士,副教授,E-mail:weijin@chd.edu.cn。

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更新日期/Last Update: 2025-11-25