沉管隧道砂填充层状态评估及对分段变形的影响

IF 8.2 1区 工程技术 Q1 ENGINEERING, CIVIL
Ziyao Xu , Ailan Che , Chao Su
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引用次数: 0

摘要

沉管隧道被认为是解决跨江、跨海交通问题的有效方法。填砂层作为沉管隧道地基处理的重要组成部分,直接影响到区段姿态的稳定性。由于隐蔽施工质量控制难度大,加之水动力环境复杂,填砂层容易出现压实缺陷,进一步导致地段姿态发生变化。然而,受限于结构隐蔽性和状态复杂性,大多数研究都将填砂层视为地基的一部分,研究其对沉降的影响,而忽略了其对地段姿态的影响。本研究提出了一种基于弹性波测试的填砂层状态评价方法,所选弹性波特征参数来自时域、频域和时频域分析。通过 K-means 聚类法对弹性波特征参数进行分类,建立了充填砂层状态与弹性波特征参数之间的关系。充填砂层的状态分为致密、不致密和空隙。建立了基于广州 BI-UT 沉管隧道不密实和空隙填砂层状态的数值模型,模拟变形和扭转。结果表明,由于存在密度较小的充填砂层,隧道段东部地区沉降较小,西部地区沉降较大,最大差异沉降为 0.04 米。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Evaluation on the state of sand filling layer and the influence on segment deformation of immersed tunnels

The immersed tunnel is considered an effective solution for traffic problems across rivers and seas. The sand filling layer, as an important part of immersed tunnel foundation treatments, directly affects segment attitude stability. Due to difficulties in quality control of concealed construction and the complex hydrodynamic environment, the sand filling layer is prone to compaction defects, further leading to changes in segment attitude. However, limited by structural concealment and state complexity, most studies consider the sand filling layer part of the foundation to study its impact on settlement while neglecting its influence on segment attitude. This research proposes an evaluation method for the sand filling layer state based on elastic wave testing and the elastic wave characteristic parameters selected come from analysis of the time domain, frequency domain and time–frequency domain. By classifying the elastic wave characteristic parameters through the K-means clustering method, the relationship between the state of the sand filling layer and the elastic wave characteristic parameters is established. The state of the sand filling layer is divided into dense, incompact, and void. A numerical model is established based on the Guangzhou BI-UT immersed tunnel with incompact and void sand filling layer states to simulate deformation and torsion. The results indicate that the settlement of the tunnel segment is low in the eastern region and high in the western region due to the presence of a less dense sand filling layer, with a maximum differential settlement of 0.04 m. The evaluation method plays a crucial role in guiding the construction of immersed tube tunnels.

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来源期刊
Underground Space
Underground Space ENGINEERING, CIVIL-
CiteScore
10.20
自引率
14.10%
发文量
71
审稿时长
63 days
期刊介绍: Underground Space is an open access international journal without article processing charges (APC) committed to serving as a scientific forum for researchers and practitioners in the field of underground engineering. The journal welcomes manuscripts that deal with original theories, methods, technologies, and important applications throughout the life-cycle of underground projects, including planning, design, operation and maintenance, disaster prevention, and demolition. The journal is particularly interested in manuscripts related to the latest development of smart underground engineering from the perspectives of resilience, resources saving, environmental friendliness, humanity, and artificial intelligence. The manuscripts are expected to have significant innovation and potential impact in the field of underground engineering, and should have clear association with or application in underground projects.
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