细粒含量对缺陷管道周围砂-细粒混合物内部侵蚀造成的地面塌陷的影响

IF 4.4 2区 工程技术 Q1 ENGINEERING, MECHANICAL
Jinlan Ren, Yang Liu, Pengqiang Yu, Yulong Zhang, Dongsheng Li
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引用次数: 0

摘要

随着城市化进程的不断推进,管道缺陷导致的地面塌陷已成为一个全球性问题。本研究通过一系列模型试验,考虑了相对较宽的细粒含量范围和三种水力条件,再现了缺陷管道周围砂-细粒混合物的内部侵蚀过程。通过分析侵蚀特征和空洞的演变过程,确定了地面塌陷的诱发机制。结果表明,在水力荷载作用下,空洞的形成和演变主要取决于细粒含量,而在细粒含量较低时,空洞会被地面沉降所取代。此外,地下水的冲刷扩大了内部侵蚀的影响,这意味着在细粒含量较低时,地面沉降明显,或在细粒含量较高时,空洞扩大甚至导致地面塌陷。为防止地面突然塌陷,不建议使用细粒含量超过 10%的砂-细粒混合物作为预埋材料。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
The influence of fines content on ground collapse due to internal erosion of sand-fines mixtures around defective pipes

Ground collapse caused by defective pipelines has become a global issue with the continuous advancement of urbanization. This study reproduced the internal erosion process of sand-fines mixtures around defective pipes through a series of model tests considering a relatively wide range of fines content and three hydraulic conditions. The erosion characteristics and the evolution of the cavity were analyzed to determine the triggering mechanisms of ground collapse. The results indicate that the formation and evolution of the cavity predominantly depend on fines content under hydraulic loading, which is replaced by ground settlement at lower fines content. Moreover, the scouring of groundwater amplifies the impact of internal erosion, which means the marked ground settlement at lower fines content or the expansion of the cavity even to ground collapse at higher fines content. To prevent sudden ground collapse, it is not recommended to use sand-fines mixtures with a fines content of more than 10% as embedment materials.

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来源期刊
Engineering Failure Analysis
Engineering Failure Analysis 工程技术-材料科学:表征与测试
CiteScore
7.70
自引率
20.00%
发文量
956
审稿时长
47 days
期刊介绍: Engineering Failure Analysis publishes research papers describing the analysis of engineering failures and related studies. Papers relating to the structure, properties and behaviour of engineering materials are encouraged, particularly those which also involve the detailed application of materials parameters to problems in engineering structures, components and design. In addition to the area of materials engineering, the interacting fields of mechanical, manufacturing, aeronautical, civil, chemical, corrosion and design engineering are considered relevant. Activity should be directed at analysing engineering failures and carrying out research to help reduce the incidences of failures and to extend the operating horizons of engineering materials. Emphasis is placed on the mechanical properties of materials and their behaviour when influenced by structure, process and environment. Metallic, polymeric, ceramic and natural materials are all included and the application of these materials to real engineering situations should be emphasised. The use of a case-study based approach is also encouraged. Engineering Failure Analysis provides essential reference material and critical feedback into the design process thereby contributing to the prevention of engineering failures in the future. All submissions will be subject to peer review from leading experts in the field.
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