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Improvement of mechanical behavior of buried pipelines subjected to strike-slip faulting using textured

Mahdi IZADI, Khosrow BARGI

《结构与土木工程前沿（英文）》 2019年第13卷第5期页码 1105-1119 doi: 10.1007/s11709-019-0539-1

摘要： The present study investigates the mechanical behavior of a new generation of buried pipelines, dubbed the textured pipeline, which is subjected to strike-slip faulting. In conventional cylindrical pipelines, the axial and bending stresses brought about in their walls as a result of fault movement, lead to local buckling, which is construed as one of the major reasons contributing to pipeline failure. The present study has assessed 3-D numerical models of two kinds of buried textured pipelines, with 6 and 12 peripheral triangular facets, subjected to a strike-slip faulting normal to the axis of the pipelines, with and without internal pressure, with the two kinds of X65 and X80 steel, and with different diameter-to-thickness ratios. The results indicate that, because of specific geometry of this pipeline shell which is characterized by having lower axial stiffness and higher bending stiffness, compared to conventional cylindrical pipeline, they are considerably resistant to local buckling. The results of this study can be conceived of as a first step toward comprehensive seismic studies on this generation of pipelines which aim at replacing the conventional cylindrical pipelines with textured ones in areas subjected to fault movement.

关键词： buried pipeline textured pipeline local buckling

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Investigating peak stresses in fitting and repair patches of buried polyethylene gas pipes

Reza KHADEMI ZAHEDI, Pouyan ALIMOURI, Hooman KHADEMI ZAHEDI, Mohammad SHISHESAZ

《结构与土木工程前沿（英文）》 2020年第14卷第1期页码 147-168 doi: 10.1007/s11709-019-0587-6

摘要： Nowadays, polyethylene composes a large number of natural gas distribution pipelines installed under the ground. The focus of the present contribution is two fold. One of the objectives is to investigate the applicability of polyethylene fittings in joining polyethylene gas pipes which are electrofused onto the pipe ends and buried under the ground, by estimating stress distribution using finite element method. The second objective is to study the effectiveness of polyethylene repair patches which are used to mend the defected pipelines by performing a finite element analysis to calculate peak stress values. Buried polyethylene pipelines in the natural gas industry, can be imposed by sever loadings including the soil-structure interaction, traffic load, soil’s column weight, internal pressure, and thermal loads resulting from daily and/or seasonal temperature changes. Additionally, due to the application of pipe joints, and repair patches local stresses superimposed on the aforementioned loading effects. The pipe is assumed to be made of PE80 resin and its jointing socket, and the repair patch is PE100 material. The computational analysis of stresses and the computer simulations are performed using ANSYS commercial software. According to the results, the peak stress values take place in the middle of the fitting and at its internal surface. The maximum stress values in fitting and pipe are below the allowable stresses which shows the proper use of introduced fitting is applicable even in hot climate areas of Ahvaz, Iran. Although the buried pipe is imposed to the maximum values of stresses, the PE100 socket is more sensitive to a temperature drop. Furthermore, all four studied patch arrangements show significant reinforcing effects on the defected section of the buried PE gas pipe to transfer applied loads. Meanwhile, the defected buried medium density polyethylene gas pipe and its saddle fused patch can resist the imposed mechanical and thermal loads of 22°C temperature increase. Moreover, increasing the saddle fusion patch length to 12 inches reduces the maximum stress values in the pipe, significantly.

关键词： Ansys software polyethylene buried pipelines polyethylene joints polyethylene patches peak von Mises stress soil-pipe interaction temperature variation

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埋地热含蜡原油管道的非稳态传热问题

崔秀国,张劲军

《中国工程科学》 2003年第5卷第7期页码 77-83

摘要：

我国生产的原油大多为含蜡原油，加热输送是含蜡原油的主要输送方式。埋地热含蜡原油管道的运行中涉及若干复杂的非稳态传热问题。从管内原油传热（内部传热）和管道与外部环境的传热（外部传热）两方面，分析和总结了含蜡原油管道非稳态传热问题的研究现状，介绍了管道在土壤中传热的影响因素，比较了其各种解析和数值解法，阐述了管道停输状态下管内含蜡原油相变传热的规律及研究方法，讨论了非稳定流动状态下管内油流的水力—热力耦合问题及求解方法，指出了埋地热含蜡原油管道的非稳态传热方面需进一步研究的问题。

关键词：石蜡基原油管道输送非稳态传热

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Safety assessment for buried drainage box culvert under influence of underground connected aisle blasting

《结构与土木工程前沿（英文）》 2023年第17卷第2期页码 191-204 doi: 10.1007/s11709-022-0906-1

摘要： Blasting engineering in complex urban environments is considered to influence the safety and stability of the overlying drainage box culvert structure owing to vibration. Therefore, field blasting and vibration tests were performed on the blasting engineering of the Wuhan Metro Line 8 connected aisle, and the LS-DYNA software was used to analyze the dynamic response characteristics of an underground drainage box culvert during the blasting test. The vibration response evolution law of the buried drainage box culvert under blasting vibration was investigated, and a safe surface control standard for the blast vibration of a drainage box culvert is proposed. The results reveal that the maximum tensile stress of the box culvert structure was 0.33 MPa. The peak particle velocity (PPV) and peak tensile stress (PTS) of the drainage box culvert decreased as the water level in the box culvert increased. Based on the relationship between the tensile stress of the box culvert, PPV of the box culvert, and PPV of the surface, it is proposed that the surface control velocity of the buried drainage box culvert is 1.36 cm/s.

关键词： drainage box culvert underpass blasting dynamic response numerical simulation safety assessment

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超小间距非对称浅埋隧道施工监控量测及分析

王云龙,谭忠盛,陈鹰

《中国工程科学》 2012年第14卷第11期页码 24-28

摘要：

以青岛胶州湾海底隧道团岛段小间距隧道为例，通过现场监测结果分析了小间距非对称浅埋隧道的围岩压力特征及支护受力，结果表明该隧道后行洞围岩压力及支护受力都较大，这种结果有别于大部分小间距对称隧道的理论预测及实测结果。为有效缓解这些问题，对支护参数进行及时调整，增强后行洞的径向支护能力并对中间岩柱采取加固措施。继后施工中的监测结果显示，后行洞的稳定性得到了有效的控制，为类似小间距隧道的设计和施工提供了借鉴和参考。

关键词：隧道超小间距非对称浅埋监测

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Piezoelectric inertial robot for operating in small pipelines based on stick-slip mechanism: modeling

《机械工程前沿（英文）》 2022年第17卷第3期 doi: 10.1007/s11465-022-0697-z

摘要： Small pipes exist in industrial and biomedical fields, and require microrobots with high operational precision and large load capacity to inspect or perform functional tasks. A piezoelectric inertial pipeline robot using a “stick-slip” mechanism was proposed to address this requirement. In this study, the driving principle of the proposed robot was analyzed, and the strategy of the design scheme was presented. A dynamics model of the stick-slip system was established by combining the dynamics model of the driving foot system and the LuGre friction model, and the simulation analysis of the effect of system parameters on the operating trajectory was performed. An experimental system was established to examine the output characteristics of the proposed robot. Experimental results show that the proposed pipeline robot with inertial stick-slip mechanism has a great load capacity of carrying 4.6 times (70 g) its own mass and high positioning accuracy. The speed of the pipeline robot can reach up to 3.5 mm/s (3 mm/s) in the forward (backward) direction, with a minimum step distance of 4 μm. Its potential application for fine operation in the pipe is exhibited by a demonstration of contactless transport.

关键词： pipeline robot piezoelectric inertial drive stick-slip large load capacity dynamics model small pipeline

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我国石油天然气管材再制造发展战略研究

“我国石油天然气管道再制造发展战略研究”课题组

《中国工程科学》 2017年第19卷第3期页码 66-71 doi: 10.15302/J-SSCAE-2017.03.010

摘要：

管材作为石油天然气勘探、开采、运输的重要材料，由于腐蚀、磨损、结垢造成的管材失效，而被大量废弃，在油田堆积如山，造成了巨大的资源浪费和环境污染。本文分析石油天然气废旧管材的处理现状及存在的问题，利用先进的再制造技术对管材再制造的经济效益、社会效益和环境效益进行了论证，提出自主创新的石油天然气管材再制造产业模式及发展建议，为我国石油天然气行业降本增效和节能减排目标的实现提供新理念、新技术，为促进石油天然气行业循环经济的建设提供决策建议。

关键词：石油天然气管材再制造

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Modal analysis of acoustic leak signal in pipelines using time-frequency analysis

JIAO Jing-pin, FEI Ren-yuan, HE Cun-fu, WU Bin

《机械工程前沿（英文）》 2006年第1卷第2期页码 146-150 doi: 10.1007/s11465-006-0013-3

摘要： It is important to analyze the propagation characteristics of guided waves in acoustic leak location in pipelines. In this paper, the acoustic leak signal is analyzed in the time-frequency domain. Based on the relation of time-frequency distribution of the acoustic leak signal and the dispersion curves of guided waves, the mode components of acoustic leak signals were obtained. The research can provide a guideline for the mode selection in pipeline leak location, and help improve the accuracy of leak location.

关键词： dispersion selection guided research time-frequency

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Determining the optimum economic insulation thickness of double pipes buried in the soil for district

Fating LI, Pengfei JIE, Zhou FANG, Zhimei WEN

《能源前沿（英文）》 2021年第15卷第1期页码 170-185 doi: 10.1007/s11708-020-0680-5

摘要： The insulation thickness (IT) of double pipes buried in the soil (DPBIS) for district heating (DH) systems was optimized to minimize the annual total cost of DPBIS for DH systems. An optimization model to obtain the optimum insulation thickness (OIT) and minimum annual total cost (MATC) of DPBIS for DH systems was established. The zero point theorem and fsolve function were used to solve the optimization model. Three types of heat sources, four operating strategies, three kinds of insulation materials, three buried depth (BD) values, and seven nominal pipe size (NPS) values were considered in the calculation of the OIT and MATC of DPBIS for DH systems, respectively. The optimization results for the above factors were compared. The results show that the OIT and MATC of DPBIS for DH systems can be obtained by using the optimization model. Sensitivity analysis was conducted to investigate the impact of some economic parameters, i.e., unit heating cost, insulation material price, interest rate, and insulation material lifetime, on optimization results. It is found out that the impact of sensitivity factors on the OIT and MATC of DPBIS for DH systems is different.

关键词： double pipes optimization model optimum insulation thickness minimum annual total cost

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原油成品油管道同沟敷设新技术中的热力分析

凌霄,王艺,宇波,张劲军,达鑫,张争伟

《中国工程科学》 2008年第10卷第11期页码 30-36

摘要：

采用非结构化有限容积法，对原油成品油双管同沟敷设新技术进行数值模拟，详细研究了不同管间距下成品油管道对加热输送原油管道的热力影响，尤其是对热油油温的影响。

关键词：输油管道双管同沟敷设热力分析数值模拟管间距

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钻地武器的毁伤效应及深地下防护工程关键科学问题

范鹏贤,钱七虎,王明洋

《中国工程科学》 2013年第15卷第5期页码 47-58

摘要：

防护工程是国防威慑力量的重要组成部分，具有重要的战略地位。美俄等军事大国大力发展的深钻地（核）武器已经对我国重要防护工程的生存造成了严重的威胁。本文总结了外军现役钻地（核）武器的性能指标与发展前景，对钻地武器的毁伤效应进行了评估和分析，综述了侵彻效应、爆炸成坑效应、爆炸地冲击效应等方面的研究成果。针对新时期的主要威胁，简述了提高防护工程防护能力的主要措施和技术途径，提出了主被动结合的综合防护体系、深部非线性岩体力学、摆型波与超低摩擦现象、多弹聚集打击效应等目前亟需开展研究的关键科学问题。

关键词：钻地武器毁伤效应深地下防护工程

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浅埋富水软弱围岩隧道支护受力特征及方案研究

万飞,谭忠盛,杨森森,马栋

《中国工程科学》 2014年第16卷第8期页码 45-53

摘要：

依托关角隧道河谷浅埋段，展开富水软弱围岩隧道支护受力特征及方案的研究。对试验段的初支围岩压力、钢架应力、锚杆轴力、衬砌水压力进行现场监测，结果表明：初支应力不能得到有效控制、突水突泥塌方现象时有发生，现有的支护方案无法满足浅埋段安全施工要求。在监测数据基础上，经过综合分析，对支护方案作出调整。在Ⅴ级围岩区段，拱部120°范围设超前管棚和小导管，宽大节理掌子面超前小导管注浆加固，初期支护取消系统锚杆，采用I20 型钢钢架和拱墙设双层钢筋网；在Ⅵ级围岩区段，超前支护采用管棚工作室施作拱部180°及以下1 m范围的0°角长管棚，全断面超前水平钻孔注浆，初期支护取消系统锚杆，采用I20 型钢钢架、三台阶型钢临时横撑和双层防水板。研究成果可为河谷浅埋隧道支护方案的确定提供理论依据和基础数据，为同类工程的设计与施工决策提供借鉴。

关键词：隧道工程河谷浅埋软弱围岩支护方案现场监测

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我国天然气掺氢产业发展研究

仲冰,张学秀,张博,彭苏萍

《中国工程科学》 2022年第24卷第3期页码 100-107 doi: 10.15302/J-SSCAE-2022.03.011

摘要：

氢能产业是实现终端用能绿色低碳转型的重要依托，而氢能输送效率是现阶段制约氢能产业发展的瓶颈环节；天然气管道掺氢输送可在短期内提升氢能的时空调配规模与效率，为扩大氢能应用规模提供解决方案。本文在界定天然气掺氢产业链范畴的基础上，探讨了发展天然气掺氢产业在推动氢能产业发展、解决可再生能源消纳、保障能源供应安全、实现终端用能深度减碳、推动能源科技创新等方面的重要价值；梳理了天然气掺氢产业的国际进展、国内现状，据此凝练了掺氢比例、管材及终端设备适应性、安全性、经济性等关键问题。研究建议，加强天然气掺氢产业顶层设计，构建适合我国国情的天然气掺氢产业安全监管、技术与运营管理标准体系；以政府引导、企业主导、多方参与、利益共享为原则，积极布局掺氢天然气示范项目；探索形成掺氢天然气多元化应用场景与商业模式，培育健康可持续的天然气掺氢产业生态圈，从而稳步推动掺氢天然气产业规模化发展。

关键词：天然气掺氢氢能运输天然气管网可再生能源消纳产业规模化