|Table of Contents|

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

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

Issue:
2025年06期
Page:
124-139
Research Field:
桥隧工程
Publishing date:

Info

Title:
Study on bearing characteristics of composite semi-curved wall of shallow buried double-arch tunnel in sand stratum
Author(s):
WEI Jin1;  WANG Weixiao1;  BIAN Haiding1;  ZHANG Wei2;  WANG Penglu2;  FENG Chang2;  WEN Han1; 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)
Keywords:
tunnel engineering;  double-arch tunnel;  middle partition wall;  semi-curved form;  bearing characteristic;  filed monitoring;  numerical simulation
PACS:
U455
DOI:
10.19815/j.jace.2024.07096
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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Last Update: 2025-11-25