考虑管道损坏渗漏和盾构隧道施工综合影响的地面沉降和管道变形规律研究

IF 4.9 2区 工程技术 Q1 ENGINEERING, CIVIL
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引用次数: 0

摘要

在非饱和土体中掘进穿越现有管线的过程中,长期 "暗漏 "的管线会大大降低管线与隧道之间地层的稳定性。当盾构掘进工作面接近管线下方时,周围地层和管线会发生过度沉降,从而引发工程事故。本研究基于自主开发的双线隧道盾构掘进穿越现有管道的模型实验系统。研究了小规模无泄漏盾构施工引起的地面沉降和管道变形。进行了实验研究,并通过与理论解的比较验证了结果的准确性。结果表明,在渗漏水的影响下,地面沉降和管道变形显著增加。研究还确定,双线隧道开挖产生的位移场并不是单线隧道开挖产生的位移场的简单叠加。双线隧道开挖过程中产生的反复扰动会对位移场的重新分布产生重大影响。此外,还建立了考虑管道泄漏影响的盾构施工三维(3D)模型。本研究讨论了垂直和水平泄漏扩散范围变化引起的地面沉降和管道变形模式。计算结果表明,泄漏的扩散深度是控制沉降范围的主要因素。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Study on the Rules of Ground Settlement and Pipeline Deformation Considering the Combined Effects of Pipeline Damage Leakage and Shield Tunneling Construction

A pipeline with long-term “hidden leakage” will greatly reduce the stability of the ground between the pipeline and tunnel in the process of tunneling through existing pipelines in unsaturated soil. Excessive settlement of the surrounding strata and pipelines can occur when the shield excavation face approaches below a pipeline, which can lead to engineering accidents. This study is based on a self-developed model experimental system for tunneling through an existing pipeline with a double-line tunnel shield. The ground settlement and pipeline deformation caused by shield construction with small-scale and no leakages are investigated. An experimental study is conducted and the accuracy of the results is verified through a comparison with theoretical solutions. The results demonstrate that there is a significant increase in ground settlement and pipeline deformation under the influence of leakage water. It is also determined that the displacement field generated by the excavation of a double-line tunnel is not simply a superposition of the displacement field generated by the excavation of a single-line tunnel. The repeated disturbances caused by the excavation of a double-line tunnel significantly influences the redistribution of the displacement field. Additionally, a three-dimensional (3D) model of shield construction considering the influence of pipeline leakage is established. This study discusses the ground settlement and pipeline deformation patterns caused by changes in the vertical and horizontal leakage diffusion ranges. The computational results indicate that the diffusion depth of a leakage is the primary factor controlling the extent of settlement.

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来源期刊
Transportation Geotechnics
Transportation Geotechnics Social Sciences-Transportation
CiteScore
8.10
自引率
11.30%
发文量
194
审稿时长
51 days
期刊介绍: Transportation Geotechnics is a journal dedicated to publishing high-quality, theoretical, and applied papers that cover all facets of geotechnics for transportation infrastructure such as roads, highways, railways, underground railways, airfields, and waterways. The journal places a special emphasis on case studies that present original work relevant to the sustainable construction of transportation infrastructure. The scope of topics it addresses includes the geotechnical properties of geomaterials for sustainable and rational design and construction, the behavior of compacted and stabilized geomaterials, the use of geosynthetics and reinforcement in constructed layers and interlayers, ground improvement and slope stability for transportation infrastructures, compaction technology and management, maintenance technology, the impact of climate, embankments for highways and high-speed trains, transition zones, dredging, underwater geotechnics for infrastructure purposes, and the modeling of multi-layered structures and supporting ground under dynamic and repeated loads.
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