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Technical innovation for Sanyang Road Cross-river Tunnel Project

Yu ZHONG

《工程管理前沿（英文）》 2018年第5卷第3期页码 411-415 doi: 10.15302/J-FEM-2018206

摘要：

关键词： valign= top class= J_zhaiyao

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Connection of the prefabricated updeck of road tunnels by a short lap-spliced joint using ultra-high-performance

《结构与土木工程前沿（英文）》页码 870-883 doi: 10.1007/s11709-023-0977-7

摘要： Prefabricated internal structures of road tunnels, consisting of precast elements and the connections between them, provide advantages in terms of quality control and manufacturing costs. However, the limited construction space in tunnels creates challenges for on-site assembly. To identify feasible connecting joints, flexural tests of precast straight beams connected by welding-spliced or lap-spliced reinforcements embedded in normal concrete or ultra-high-performance fiber-reinforced concrete (UHPFRC) are first performed and analyzed. With an improvement in the strength grade of the closure concrete for the lap-spliced joint, the failure of the beam transforms from a brittle splitting mode to a ductile flexural mode. The beam connected by UHPFRC100 with short lap-spliced reinforcements can achieve almost equivalent mechanical performance in terms of the bearing capacity, ductility, and stiffness as the beam connected by normal concrete with welding-spliced reinforcements. This favorable solution is then applied to the connection of neighboring updeck slabs resting on columns in a double-deck tunnel. The applicability is validated by flexural tests of T-shaped joints, which, fail in a ductile fashion dominated by the ultimate bearing capacity of the precast elements, similar to the corresponding straight beam. The utilization of UHPFRC significantly reduces the required lap-splice length of reinforcements owing to its strong bonding strength.

关键词： UHPFRC prefabricated updeck road tunnel lap-spliced rebars flexural tests

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Impacts of opening baffle of city road tunnels on natural ventilation performance

Weixiao YANG, Jincheng XING, Jianxing LI, Jihong LING, Haixian HAO, Zhiqiang YAN

《结构与土木工程前沿（英文）》 2013年第7卷第1期页码 55-61 doi: 10.1007/s11709-013-0194-x

摘要： Based on the opening baffle mode for natural ventilation of city road tunnels, this paper studies the impacts of opening baffle on natural ventilation performance by verifying numerical simulation through model tests. By analyzing the impacts of installation angle, dimension, location, and quantity of opening baffle on ventilation performance, the paper reached the conclusions as follows: 1) When installation angle is larger than 45° and tunnel ventilation is well operated, the baffle exhaust could increase by at least 30% compared to when there is no baffle. 2) The baffle reaches its optimal performance when the length of the baffle is equal to the width of the city road tunnels. 3) Baffle exhaust could increase by 30% when it is installed in the downstream of openings. 4) The performance of a single baffle is better than that of multiple baffles.

关键词： city road tunnel numerical simulation baffle top opening natural ventilation

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终南山公路隧道非机械式通风效果研究

郑晅,郭佳奇

《中国工程科学》 2010年第12卷第3期页码 39-44

摘要：

秦岭终南山特长公路隧道规模庞大，通风系统复杂，为了合理确定通风配置，节约通风费用，评估自然风和交通活塞风等非机械式通风方式的通风效果就显得非常重要。课题组现场监测了终南山特长公路隧道内的自然风速、交通量及自然风压和交通风压共同作用下的风速，收集了大量数据。通过对监测数据的处理、分析得出，较大自然风速出现在10∶00—14∶00这个时间段，最大自然风速达到2.576 m/s；隧道东、西线交通量出现高峰期的时间段基本恒定；隧道东线内自然风压和交通风压共同作用下的风速较大的时间段基本上与交通量高峰期时间段相吻合，而西线这两个时间段吻合性较差，洞内风速变化相对平缓。考虑洞口外风向频率、风向、洞口实测温度等参数的自然风速计算方法计算值与实测自然风速较接近。隧道内自然风压和交通风压联合作用下的风速计算值虽小于现场实测值，但较接近实测值。

关键词：隧道通风现场监测非机械式通风自然风交通活塞风

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长大公路隧道火灾安全疏散性能化设计与分析

陈长坤,徐志胜

《中国工程科学》 2007年第9卷第9期页码 78-83

摘要：

基于性能化防火设计方法，分析火灾条件下长大公路隧道内人员疏散行为的特点，给出隧道内人员疏散的安全判据，并结合某隧道的结构及车流特征对人员疏散过程进行了数值模拟研究，分析隧道在正常通车和局部行车堵塞时，不同火源位置、横通道间距与横通道宽度对人员疏散时间及安全状态的影响。结果表明,与建筑内人员疏散不同，长大公路隧道内火灾的可用安全疏散时间(ASET)与需要的安全疏散时间(RSET)均为沿隧道长度方向位置的函数。隧道内人员安全疏散的时间曲线在各横通道疏散口出现峰值，这主要是受到横通道通行能力的限制，各疏散口人员集聚等待所致。当隧道发生局部堵塞时，横通道口需要的安全疏散时间显著增加，危险性也急剧增大。隧道内人员疏散的性能化防火设计应综合考虑火源位置对人员载荷及疏散口位置可用安全疏散时间的影响。该研究为公路隧道火灾安全疏散设施的优化设计提供依据。

关键词：疏散火灾隧道横通道性能化防火设计

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Characteristics and application of road absorbing solar energy

Zhihua ZHOU, Shan HU, Xiaoyan ZHANG, Jian ZUO

《能源前沿（英文）》 2013年第7卷第4期页码 525-534 doi: 10.1007/s11708-013-0278-2

摘要： If the heat of road surface can be stored in summer, the road surface temperature will be decreased to prevent permanent deformation of pavement. Besides, if the heat stored is released, it can supply heat for buildings or raise the road surface temperature for snow melting in winter. A road-solar energy system was built in this study, and the heat transfer mechanism and effect of the system were analyzed according to the monitored solar radiant heat, the solar energy absorbed by road and the heat stored by soil. The results showed that the road surface temperature was mainly affected by solar radiation, but the effect is hysteretic in nature. The temperature of the solar road surface was 3°C–6°C lower than that of the ordinary road surface. The temperature of the solar road along the vertical direction was 2°C–5°C lower than that of the ordinary road. The temperature difference increased as the distance to the heat transfer tubes decreased. The average solar collector efficiency of the system was 14.4%, and the average solar absorptivity of road surface was 36%.

关键词： solar energy road-solar energy system road surface temperature solar absorptivity of road surface solar collector efficiency of system

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Development and road performance of clear asphalt with high transparency and adhesion

《结构与土木工程前沿（英文）》 2023年第17卷第2期页码 238-255 doi: 10.1007/s11709-022-0898-x

摘要： Clear asphalt (CA) currently used in light-colored asphalt mixtures (LCAM) exhibits poor transparency and adhesion. Therefore, a highly transparent CA (HCA) modified using a silane coupling agent (KH550) was prepared. Furthermore, LCAM was prepared by mixing CA and limestone aggregates. The properties of the HCA and ordinary CA (OCA) were characterized using conventional asphalt tests, optical tests, pull-off tests, ultraviolet aging tests, dynamic shear rheometry, Fourier-transform infrared spectroscopy, differential scanning calorimetry, and scanning electron microscopy. Whereas Marshall, moisture resistance, wheel tracking, trabecular bending, and British pendulum tests were employed for the LCAM. The transmittance and spectral reflectance of the HCA were 123.30 and 3.74 times greater than those of the OCA, respectively. The complex modulus and viscosity-aging index of the HCA were 48% and 53% less than those of the OCA, respectively. After modification with KH550, the Marshall stability ratio, tensile strength ratio, and flexural strain of the HCA-prepared LCAM increased by 12.92%, 25.06%, and 23.90%, respectively. However, the rutting resistance of the HCA-prepared LCAM was 14.3% less than that of the OCA-prepared LCAM. The comprehensive performances of the HCA and HCA-prepared LCAM were 49.2% and 10.3% greater than those of the OCA and OCA-prepared LCAM, respectively, indicating a high application value in the future.

关键词： light-colored asphalt pavement orthogonal test road performance spectral reflectance silane-coupling agent

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Special issue: Management of road and railway traffic and transportation engineering

Yongfu SUN, Ziyou GAO

《工程管理前沿（英文）》 2017年第4卷第4期页码 385-387 doi: 10.15302/J-FEM-2017110

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Rational Understanding about Renaissance Path of China's Road and Bridge Engineering

Mao-run Feng,Zheng-song Zhao

《工程管理前沿（英文）》 2014年第1卷第1期页码 42-51 doi: 10.15302/J-FEM-2014013

摘要： At the turn of this century, China began the largest road and bridge development in the world, which has virtuously interacted with the social and economic development and has elevated the engineering technology to world-class level. Surveying the development of world transportation, and comparing the road and bridge construction efforts of Europe, U.S.A, Japan and China, general experiences of success can be derived as follows: It is greatly beneficial to give priority to transportation for economic development; it takes national strategy and social action to build up a transportation network; demand and innovation are the driving forces to upgrade road and bridge technology; management innovation and quality assurance can greatly improve development caliber. While rationally acknowledging China's transportation infrastructure achievements, we should reflect on issues with Chinese characteristics that have affected quality and efficiency, expose all construction practices that violate scientific law, overall management defects in road and bridge construction and maintenance, and search for new ways to strengthen social management and the creation of a healthy soft environment.

关键词： road network expressway bridge project technological innovation construction management social management

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Quantification of emission variability for off-road equipment in China based on real-world measurements

《环境科学与工程前沿（英文）》 2022年第16卷第2期 doi: 10.1007/s11783-021-1455-x

摘要：

• Emissions from 53 in-use diesel-fueled off-road equipment were measured.

关键词： Off-road equipment Portable emission measurement system (PEMS) Real-world emissions Diesel engine

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“Heavenly Road”: The Qinghai–Tibet Railway

Yongfu SUN

《工程管理前沿（英文）》 2020年第7卷第2期页码 304-307 doi: 10.1007/s42524-019-0079-3

摘要： Xiaobo WANG. [J]. Front. Eng, 2019, 6(1): 131-137.Peter REDFERN, Hua ZHONG. [J]. Front. Eng, 2017, 4(2): 193-200.Qixiang FAN. [J]. Front. Eng, 2017, 4(2): 231-237.Ming-zhou Liu,Cong-hu Liu,Mao-gen Ge,Yuan Zhang,Qing-hua Zhu. [J]. Front. Eng, 2016, 3(2): 144-146.Yu Zhao,Sheng-quan Wang,Ke-chao Zhu. [J]. Front. Eng, 2015, 2(1): 35-38.Ru-gui Chen,Jia-meng Chen. [J]. Front. Eng, 2014, 1(1): 52-61.An Wang. [J]. Front. Eng, 2014, 1(1): 13-17.

关键词： permafrost protection sustainable development health guarantee system

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无损检测技术评估和检测道路性能

郭成超,许朋飞,钟燕辉

《中国工程科学》 2017年第19卷第6期页码 72-79 doi: 10.15302/J-SSCAE-2017.06.011

摘要：

目前，在我国的基础设施管理方面，存在维修工作安排不当、养护维修不及时、维修预算支出庞大等问题。因此，为了保障道路安全，防止发生灾难性的破坏，需要采取快速、有效的养护管理方法，以提高道路的使用寿命。根据美国材料与试验协会（ASTM）路面状况评价标准，本文介绍了五种道路无损检测技术和设备：落锤式弯沉仪、探地雷达、宏观构造深度、国际平整度指数和面波的频谱分析，并分别介绍了每种检测技术的工作原理和运用方法，以指导相关人员结合实际合理选用。运用这几种检测方法将会在不封闭交通的情况下加快评估速度，并为搭建一个高效、智能的路网监测系统提供技术支持，为道路的可持续发展、资金的高效利用提供切实可行的方法。

关键词：道路检测道路病害无损检测

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Green Road Construction Technologies in Guangzhou

Guan-feng An,Wen-yuan Huang,Jing-feng Zhang

《工程管理前沿（英文）》 2016年第3卷第1期页码 80-86 doi: 10.15302/J-FEM-2016002

摘要： Total road pavement in Guangzhou reaches 77 ×10 m . Its huge maintenance and potential rehabilitation calls for a green road system. This paper presents a discussion, first about green road construction technologies together with their applications and development like reclaimed asphalt pavement, rubberized asphalt pavement, and warm mix asphalt; and then, about the key obstacles for promotion and activities, primarily for green road promotion, in the perspectives of the current technical and application situations in China and separately in Guangzhou. Based on environmental and conditional analysis, as well as a development expectation from an industrial viewpoint, this paper creates a development trend of green road technologies.

关键词： road green construction recycling of waste asphalt rubber asphalt

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Connecting the Belt and Road through sea-rail collaboration

Chenhao ZHOU, Haobin LI, Wencheng WANG, Loo Hay LEE, Ek Peng CHEW

《工程管理前沿（英文）》 2017年第4卷第3期页码 315-324 doi: 10.15302/J-FEM-2017031

摘要： As part of China’s “the Belt and Road” strategy, China Railway Express provides alternative shipping routes and transportation modes from Asia to Europe and creates new opportunities for intermodal transportation in the shipping industry. A time–distance-based cost (time cost) function was proposed to compare China Railway Express with traditional transportation modes. Time cost was related to different types of cargoes, which exhibit distinct sensitivity to time. Using the proposed cost function as basis, we identified the cost indifference area where total costs are equal. Further analysis was performed for selecting the transportation mode and supply area for a specific cargo. This study provides various parties, such as business owners, the government, and the shipping industry, with many valuable insights.

关键词： China Railway Express the Belt and Road shipping industry combined transportation