Evaluation of the dynamic additional impact about foundation pit construction on the existing adjacent subway station with the PBA method

IF 0.8 Q4 ENGINEERING, CIVIL Electronic Journal of Structural Engineering Pub Date : 2023-12-13 DOI:10.56748/ejse.23525
Lijun Wang, Yongxing Dai, Zekun Chen, Huijian Zhang, Gongning Liu
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Abstract

In this paper, relying on the Tianhe East Station project of Guangzhou Subway Line 11, the deformation and mechanical evolution rules about the existing adjacent stations with the pile-beam-arch (PBA) method in the all excavation stages about the new foundation pit is evaluated through numerical calculation method. It was revealed that that the largest displacement about the existing station’s side wall and the middle column reaches 2.1mm and 1.5mm respectively during the excavation about the foundation pit. Due to the impact about construction of the foundation pit, the uplifting phenomenon occurs on the side of the foundation pit, and the maximum uplifting value reaches 0.4mm. When the construction about foundation pit is finished, the whole station floor shows a deformation form of “left lower torsion”, and the largest compressive stresses as well as tensile stresses about the side wall and the bottom plate do not reach the standard limiting value, and the whole is being a relative safe status. With the increase about the excavation depths, the axial forces about the middle column gradually increase to 7016kN, and the incremental axial forces about the middle column after the construction is completed accounts for about 11.7% of the axial force of initial construction. Therefore, the disturbance effect about foundation pit construction on the adjacent station with the PBA method can not be ignored. The research result in this paper may offer some important references for the construction and design of similar cases.
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采用 PBA 方法评估基坑施工对邻近现有地铁站的动态额外影响
本文以广州地铁十一号线天河东站工程为依托,通过数值计算方法,对采用桩-梁-拱(PBA)工法的既有邻近车站在新基坑开挖各阶段的变形及力学演变规律进行了评估。结果表明,在基坑开挖过程中,既有车站侧墙和中柱的最大位移分别达到 2.1mm 和 1.5mm。由于基坑施工的影响,基坑侧面出现隆起现象,最大隆起值达到 0.4mm。基坑施工结束后,整个车站底板呈现 "左下扭转 "的变形形式,侧壁和底板的最大压应力和拉应力均未达到标准限值,整体处于相对安全状态。随着开挖深度的增加,中柱轴力逐渐增加到 7016kN,施工完成后中柱轴力增量约占施工初期轴力的 11.7%。因此,PBA 法基坑施工对相邻车站的扰动效应不容忽视。本文的研究成果可为类似工程的施工和设计提供重要参考。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Electronic Journal of Structural Engineering
Electronic Journal of Structural Engineering Engineering-Civil and Structural Engineering
CiteScore
1.10
自引率
16.70%
发文量
0
期刊介绍: The Electronic Journal of Structural Engineering (EJSE) is an international forum for the dissemination and discussion of leading edge research and practical applications in Structural Engineering. It comprises peer-reviewed technical papers, discussions and comments, and also news about conferences, workshops etc. in Structural Engineering. Original papers are invited from individuals involved in the field of structural engineering and construction. The areas of special interests include the following, but are not limited to: Analytical and design methods Bridges and High-rise Buildings Case studies and failure investigation Innovations in design and new technology New Construction Materials Performance of Structures Prefabrication Technology Repairs, Strengthening, and Maintenance Stability and Scaffolding Engineering Soil-structure interaction Standards and Codes of Practice Structural and solid mechanics Structural Safety and Reliability Testing Technologies Vibration, impact and structural dynamics Wind and earthquake engineering. EJSE is seeking original papers (research or state-of the art reviews) of the highest quality for consideration for publication. The papers will be published within 3 to 6 months. The papers are expected to make a significant contribution to the research and development activities of the academic and professional engineering community.
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