Most downloaded articles

1 Review of Snow and Ice Melting Techniques for Road and Bridge in Cold Regions

TANG Liyun , SHAO Haitao , TANG Huaming , QIU Peiyong , DU Xiaoqi , ZHANG Lei , PENG Hui

2024, 44(5):25-38. DOI: 10.14048/j.issn.1671-2579.2024.05.003

[Abstract](1566) [HTML](4203) [PDF 1.95 M](9194)

Abstract:
Snow and ice melting of road and bridge surfaces is crucial for traffic safety，but current research on snow and ice melting techniques mainly focuses on engineering effects and technical evaluation，without the analysis and elaboration from the perspective of their mechanisms.To this end，based on the different mechanisms，this study divided snow and ice melting techniques into three types and summarized them：passive deicing，active deicing，and energy utilization deicing.This study systematically evaluated the advantages and disadvantages of traditional deicing methods such as deicing agents and mechanical deicing，analyzed two active deicing techniques，namely inhibitive freezing pavement and phase change material pavement，discussed the environmental-friendly method for road deicing by using phase change materials，and introduced the mechanisms of different energy utilization deicing techniques.This study analyzed the existing road deicing techniques，their actual application effects，and existing problems，to provide foundational support for the research of snow and ice melting on roads and bridges in cold regions.

2 Comparison of Chinese ， Ame rican， and Bangladeshi Criteria for Liquefaction Judgment o f Fine‑Grained Soil

WU Zi

2024, 44(4):263-268. DOI: 10.14048/j.issn.1671-2579.2024.04.031

[Abstract](1051) [HTML](2061) [PDF 1.30 M](9172)

Abstract:
The criteria for liquefaction judgment of fi ne-grained soil in current seismic design codes of China，the United States，and Bangladesh are quite different.In order to propose the judgment criteria for engineering application and Chinese code revision，this paper compared the judgment processes and criteria of the three countries.After analyzing the formation process，based on the application of the criteria for liquefaction judgment of 168 fine-grained soil samples collected in Dhaka，Bangladesh and surrounding cities，the rationality of each judgment process and criteria was evaluated comprehensively.Finally，a set of judgment processes and result criteria for fine-grained soil liquefaction integrating all criteria were put forward.

3 Progress and Prospects of Road Engineering Disease Treatment Technology in Permafrost Regions

GAO Feng , ZENG Xianzhang , ZHONG Wenhua , HUANG Shengyong , ZHANG Junhui

2024, 44(5):1-16. DOI: 10.14048/j.issn.1671-2579.2024.05.001

[Abstract](1807) [HTML](6525) [PDF 2.09 M](9163)

Abstract:
Freeze-thaw disasters are key issues affecting the service performance and operational safety of road projects in permafrost regions.Under the combined influence of warming and humidification of the permafrost environment and engineering thermal effects，the degradation of permafrost is accelerating，exacerbating the risk of road freeze-thaw diseases.Roads in these regions are more frequently maintained and repaired to ensure service performance，with a service life lower than designed.Therefore，deepening the understanding of the disaster mechanism of road geotechnical structures and strengthening the study on engineering disease treatment technology are of great significance in promoting the construction and maintenance of high-quality and high-grade highways in frozen regions.This paper first expounded on typical types of diseases of roads in frozen regions and explored the formation mechanism and evolution mechanism of the diseases based on internal and external factors，such as frozen soil properties，climate and topography，road materials，and structures.Then the current situations and development of disease treatment technology for roads in frozen regions were discussed according to the different treatment principles.Studies have shown that freeze-thaw subsidence，cracking and pitting，and mud pumping are the main diseases on these roads.The causes include frozen soil properties，climate and topography，road materials and structures，and other factors，with subsidence and deformation induced by soaked and softened foundations due to freeze-thaw water particularly significant.Therefore，the line selection should be fully optimized in road planning.According to the different principles of treatment of in-service road diseases，the existing treatment technologies can be divided into three categories：measures of passively cooling subgrade，measures of actively cooling subgrade，and measures of enhancing frozen soil foundation.Among them，the study and application of the former two categories are relatively systematic and comprehensive，and the subsequent focus should be on improving temperature control performance and the combined use of multiple treatment measures.The frozen soil foundation enhancement technology，with good application prospects and promotion value，is currently under exploration and tests，requiring further study in the design method and construction technology.Moreover，as for the disease treatment technology，the performance of in-service roads should be emphasized and the evaluation of the treatment effects should be strengthened.To reduce the risk of road diseases in frozen regions and ensure the safety of plateau transportation，this study points out that the research direction and focus should be an integrated disease treatment technology centered on a comprehensive chain of “foundation enhancement-subgrade temperature control-integrated drainage ”.

4 Fume Emission and Environmental Impact Assessment in Fresh Asphalt Tunnel Construction Site

DENG Wenti , ZOU Guilian , ZHANG Yuan , YU Liang , XIE Huiduan

2024, 44(4):210-216. DOI: 10.14048/j.issn.1671-2579.2024.04.025

[Abstract](1105) [HTML](1649) [PDF 1.50 M](9053)

Abstract:
In view of the random monitori ng of fum e emission in asphalt pavement construction sites，combined with the engineering application of fresh asphalt in the construction of hot-mixed and hot-spread asphalt pavement in large and long tunnels for fume emission reduction，the fume collection and evaluation method of asphalt pavement construction sites were studied，and the emission reduction effect of fresh asphalt was evaluated.The Summa tanks were used to collect the asphalt fume at different positions of the paver，and the asphalt fume was quantitatively analyzed by gas chromatograph-mass spectrometer （GC-MS）.The results show that compared with the non-fresh asphalt from the same source，the fresh asphalt reduces the total mass concentration of volatile organic compounds （VOCs） in the asphalt fume at the edge of the paver，the middle of the paver flank，and the upper position of the paver by 57.0%，22.6%，and 27.4% during pavement construction，respectively.The fresh asphalt mixture reduces the total mass concentration of class 1 and 2 carcinogens by 62.3% at the edge of the paver during construction，and the odor intensity is only about 1/3 of the non-fresh asphalt mixture.The study suggests that the total mass concentration of VOCs，the total mass concentration of carcinogens exceeding class 2，and the odor intensity at the edge of the paver should be used as the key environmental impact assessment indexes for fume emission monitoring in the asphalt pavement construction site.

5 Construction of Carbon Emission Monitoring and Management System for Commercial Vehicles

CHANG Zheng , SONG Yan , JI Meichen , LIU Yuqing , WANG Jing

2024, 44(4):255-262. DOI: 10.14048/j.issn.1671-2579.2024.04.030

[Abstract](588) [HTML](1019) [PDF 1.12 M](9035)

Abstract:
To construct a comprehensive carbon emission monitoring and management system for commercial vehicles，firstly，this article described the background and significance of carbon emission monitoring and management of commercial vehicles and summarized the research in relevant fields in China and abroad.Then，this article expounded on the carbon emission monitoring system for commercial vehicles，which covered three major levels：monitoring target layer，monitoring implementation layer，and monitoring summary layer，so as to achieve comprehensive and accurate carbon emission monitoring.Finally，combined with the carbon emission monitoring data of commercial vehicles，this article put forward a carbon emission management system for commercial vehicles based on data information，including carbon emission data sharing and opening，data management and analysis，management strategies and measures，as well as evaluation and optimization，so as to enhance the effective carbon emission management of commercial vehicles.

6 Review on LCCA and LCA Methods for Pavement Based on BIM

YOU Shengjie , HU Yonggang , LIU Xinsuo , ZHENG Xiaoyan

2024, 44(3):85-94,103. DOI: 10.14048/j.issn.1671-2579.2024.03.010

[Abstract](1409) [HTML](1831) [PDF 1.21 M](9009)

Abstract:
Currently,life cycle cost analysis (LCCA ) and life cycle assessment (LCA ) methods are commonly used to assess the economic and environmental impacts of pavement during the whole life cycle.However,there are drawbacks in the application of LCCA and LCA methods,such as a large amount of data and multiple data categories,which lead to a tedious evaluation process.In view of this,some scholars have tried to combine building information modeling (BIM ) with LCCA and LCA methods to optimize the evaluation process.In the pavement field,the combination of LCCA and LCA with BIM is still in its infancy,lacking a summary of relevant research results.Therefore,this paper summarized the research on LCCA,LCA,and LCCA-LCA methods for pavement,as well as their combination with BIM to explore the existing problems and challenges.It is found that the application of BIM can optimize the LCCA and LCA processes and realize the dynamic coordination of design and evaluation.However,the low integration degree and the lack of unified data format standards between modeling software and evaluation software hinder the application and development of BIM.

7 Deformation and Damage Characteristics of a Newly Operated Tunnel Caused by above Foundation Pit Construction

LIU Jiqiang , ZHU Min , HAO Kun , CHEN Dengwei , CHEN Xiangsheng

2024, 44(3):202-210. DOI: 10.14048/j.issn.1671-2579.2024.03.023

[Abstract](1031) [HTML](921) [PDF 1.97 M](8862)

Abstract:
The construction of foundation pits in granite residual soil layers is prone to causing upheaval deformation and structural damage in shield tunnels below.Based on the engineering case of a newly operated metro tunnel collinear with the above long-distance deep foundation pit in Shenzhen,a three-dimensional finite element model was established to investigate the variation law of the heave and horizontal convergence of the shield tunnel caused by the deep foundation pit excavation.The correlation between the longitudinal stress of the lining structure and the damage was analyzed.The results indicate that the tunnel deformation caused by foundation pit unloading is primarily vertical heave,accompanied by slight section deformation.After adopting the jump excavation method and the stripped soil reinforcement above the tunnel crown,the average tunnel heave is reduced by 14.4%,and the lateral displacement of the envelop enclosure is reduced by 49.1%.The shield tunnel damage caused by the above unloading is mainly the spalling at the circumferential joints of the tunnel crown.The reason is that the compressive shear cracks occur and expand on the intrados of the circumferential joints of the tunnel crown under the combined action of bending moment and shear.

8 Experimental Study on Road Performance of Resin Elastomer for Seamless Expansion Joints of Bridges

ZHOU Wei , SHENG Liang , GAO Qin , ZHANG Hui , ZHAO Menglong

2024, 44(3):123-128. DOI: 10.14048/j.issn.1671-2579.2024.03.014

[Abstract](841) [HTML](1473) [PDF 1.24 M](8721)

Abstract:
Seamless expansion joint is a new type of bridge expansion joint.In order to study the road performance of resin elastomer for seamless expansion joints,the feasibility of applying resin elastomer to small and medium displacement expansion joints of bridges was explored.Through the rutting test at 60 ℃, low-temperature beam bending test at ?10 ℃,dynamic modulus test,Poisson's ratio test,and overlay test (OT),the high and low temperature stability,deformation performance,and fatigue crack resistance of the resin elastomer were compared.The test results show that the dynamic stability of the resin elastomer at 60 ℃ is more than 31 000 times/mm,and the bending strain at low temperature of ?10 ℃ exceeds 43 000 × 10?6.Under different temperatures and load conditions,the dynamic modulus is 10?12 MPa,and the Poisson's ratio of tension/compression is 0.03?0.05.The fracture energy of OT is 59% higher than that of the TST elastoplastic body.The resin elastomer for seamless expansion joints of bridges has excellent high and low temperature performance,and it is insensitive to temperature and load frequency.Therefore,it is a material with a low Poisson ’s ratio and strong fatigue crack resistance and can better meet the driving and deformation requirements of small and medium displacement expansion joints of bridges.

9 Lessons Learned from 60 Years of Pavement Trials in Continental Climate Regions of Canada and Future Perspective

WANG Di , LI Jingxiao , REN Xueyuan , ZHANG Fan , YUAN Dongdong

2024, 44(5):284-300. DOI: 10.14048/j.issn.1671-2579.2024.05.032

[Abstract](1516) [HTML](2854) [PDF 1.53 M](8041)

Abstract:
During the early 1960 s，Canadian road authorities began using stiffer asphalt to address the issue of early rutting in the wheel track zone of asphalt pavements，which was caused by the growing traffic volumes.Pavements constructed with stiffer asphalt commonly exhibit evenly spaced transverse cracks due to the significant internal stresses caused by low temperatures and the inadequate resistance of the asphalt to cracking under such conditions.Research conducted on asphalt pavements with cracks caused by low temperatures has verified the significant impact of asphalt ’s consistency，temperature sensitivity，phase uniformity，and durability.In order to tackle the difficulties presented by the utilization of modified asphalt in the current asphalt performance evaluation system，the Canadian asphalt pavement test section during the 1990 s was used to examine and assess the dependability of the U.S.Superpave ? specification.The results reveal that blown asphalt exhibits inadequate durability，while polymer modifiers only improve the durability of soft asphalt.In the early 21st century，the Ontario municipality commissioned studies on asphalt pavement test sections to enhance the current asphalt performance test specifications.These studies mainly considered the occurrences of phase separation，phase transformation，and thermally reversible aging （gelation） of asphalt，as well as the impact of polymers and fibers on the durability of asphalt.The results find that using different types of colloids （sol，gel，and sol-gel ） in the same Superpave level can result in asphalt pavements with benefit/cost ratios varying by up to 2?3 times.By assessing and choosing the appropriate type of asphalt，such as Alberta oil sand asphalt （sol），the service life of asphalt pavements can be prolonged.Compared with polymer-modified asphalt with high content，more oxidized recycled asphalt，or asphalt with higher wax content （gel），Alberta oil sand asphalt has lower wax content.The service life of asphalt pavements can be further improved by incorporating small quantities of polymer or fiber modification.Improved test specifications for asphalt cement will help save costs and meet the maintenance needs of 25 million km of asphalt pavements under global climate change.On the basis of summarizing the research of asphalt pavement trials in Canada in the past 60 years，new prospects and suggestions on the future research content and key technical problems of pavements in cold areas are put forward，which can provide a reference for future research.

10 Review of Intelligent Construction Development of Highway Infrastructures and Its Prospects

ZHENG Jianlong , CHEN Mengjie , LIU Chaochao

2025, 45(2):1-20. DOI: 10.14048/j.issn.1671-2579.2025.02.001

[Abstract](1925) [HTML](3598) [PDF 1.98 M](7628)

Abstract:
With the rapid advancement of intelligent construction, intelligent development of highway infrastructures has emerged as a key research focus. This paper focused on the whole life cycle of intelligent construction of highway infrastructures and provided a comprehensive analysis of its current status, challenges, and future directions. The discussion was organized into five key areas: intelligent material design, intelligent structural design, intelligent construction management, intelligent inspection and monitoring, and intelligent maintenance management. In intelligent materials, the paper explored the application and recent advancements of the pavement material genome program. Regarding intelligent structures, the role of computer-aided design (CAD) in pavement structural design was emphasized. For intelligent construction management, the importance and impact of intelligent monitoring systems throughout the pavement construction process were examined. In the area of inspection and monitoring intelligence, the current development and potential of embedded sensing units in pavements were discussed. Finally, in intelligent maintenance management, the paper evaluated the effectiveness and potential of ground-penetrating radar (GPR) non-destructive testing technology in highway quality assessment. The findings reveal that although intelligent construction technologies have made progress in highway infrastructures, challenges remain, including incomplete technical systems, limited data integration, and high technical costs. The future of intelligent highway infrastructure construction should focus on standardization, technological innovation, and cross-domain collaboration, so as to establish an efficient, safe, and sustainable intelligent highway infrastructure system.

11 Emergency Vehicle Dispatching Model Considering Demand Urgency and Delivery Fairness

LONG Kejun , LIU Jia , GAO Zhibo , CHEN Suqian , ZHANG Zhonggen

2024, 44(6):251-258. DOI: 10.14048/j.issn.1671-2579.2024.06.029

[Abstract](888) [HTML](1684) [PDF 1.25 M](7418)

Abstract:
In emergency vehicle dispatching after unexpected events，it is crucial to prioritize critical nodes with high demand urgency while minimizing excessive delivery delays at other nodes to prevent secondary impacts.On this basis，this study developed an emergency vehicle dispatching model that considered demand urgency and delivery delay fairness.Firstly，the entropy weight-TOPSIS method was used to calculate the demand urgency for each node，and a delivery delay balance index was introduced to minimize disparities in delivery delays between nodes.Secondly，a multi-objective optimization model was established with total delivery time，overall cost，and delivery delay balance as objectives，while considering constraints such as inventory levels at distribution centers and route continuity.Finally，the K-Means algorithm and the Clarke-Wright （CW） saving algorithm were employed to partition the sub-networks，and an improved ant colony algorithm incorporating a variable neighborhood local search was applied.The results indicate that compared with the basic model，the proposed model reduces the average and maximum delivery delays at nodes with high demand urgency by 25.26% and 22.98%，respectively，while increasing the delivery delay variance by 34.30%.Compared with a model considering only demand urgency，the proposed model decreases the average delivery delay，maximum delivery delay，and delivery delay variance at nodes with high demand urgency by 10.79%，20.26%，and 40.57%，respectively.These findings demonstrate that the proposed model effectively balances priority for critical nodes with fairness for standard nodes.

12 Mechanism of Mud Pumping on Plateau Highway under Traffic Loads and Its Treatment Strategy

ZHANG Junhui , CHEN Zhide , GAO Feng , NA Qicai , MA Pengfei , XIAO Lin

2025, 45(1):1-10. DOI: 10.14048/j.issn.1671-2579.2025.01.001

[Abstract](916) [HTML](1276) [PDF 1.65 M](7010)

Abstract:
The dynamic hydraulic response and particle migration of subgrade structures under traffic loads are fundamental to reveal the formation and development mechanisms of mud pumping. The driving mechanism of fine particle migration in the mud pumping state was explored by conducting laboratory tests on layered gravel-sandy silt columns under dynamic loads. The results show that the slurry sloshing causes alternating positive and negative pressure gradients within the gravel layer. This oscillating pressure gradient enhances the pore permeability in the underlying sandy silt layer, providing the necessary hydrodynamic conditions for fine particle migration. Fine particle migration increases the slurry turbidity to a stable value. Upon the removal of dynamic slurry loading, the fine particles quickly settle and fill the gravel pores, forming a muddy interlayer, which significantly reduces the vertical permeability of the gravel-sandy slit column. Based on the engineering practice of treating mud pumping on the G0615 Dema Expressway (Huashixia to Jiuzhi Section) in Qinghai Province, it was found that an important driver for mud pumping formation is the infiltration of rainfall and snowmelt water through the asphalt surface layer, and this water can even form “water pockets” within the subbase. When vehicles pass, the deformation of the pavement structural layers causes the slurry in the pores of the water-stable base layer to be squeezed upward through cracks, leading to continuous erosion and damage to the gravel materials. By considering construction difficulty, economic costs, and the ecological environmental protection requirements of the Qinghai?Xizang Plateau, different treatment methods such as grouting repair and sealing, as well as milling and sealing were adopted, respectively based on the severity and level of the hazard. These methods have played a positive role in sealing and reinforcing the water-stable base layer and reducing pavement permeability. The research provides valuable insights for understanding the development patterns of mud pumping, effectively enhancing the treatment capabilities and promoting high-quality maintenance of plateau highways.

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