2021 Vol. 21, No. 4

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Review
Review on cement concrete internally cured by SAP
SHEN Ai-qin, YANG Jing-yu, GUO Yin-chuan, QIN Xiao, LI Peng
Abstract: The material properties of a superabsorbent polymer (SAP) were analyzed. Key parameters of mix ratio designs for SAP internally curing concrete were evaluated. A design method for internally cured concrete was developed. The water transmission mechanism of SAP internally curing concrete was investig...
2021, 21(4): 1-31. doi: 10.19818/j.cnki.1671-1637.2021.04.001
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Review on detection and prediction methods for pavement skid resistance
TAN Yi-qiu, XIAO Shen-qing, XIONG Xue-tang
Abstract: The relevant achievements and progress of skid resistance performance of pavements were systematically reviewed based on three aspects: mechanical mechanism, detection methods, and prediction models. The friction mechanism of pavement skid resistance was introduced based on the traditional Coulomb f...
2021, 21(4): 32-47. doi: 10.19818/j.cnki.1671-1637.2021.04.002
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Review of convolutional neural network and its application in intelligent transportation system
MA Yong-jie, CHENG Shi-sheng, MA Yun-ting, MA Yi-de
Abstract: From the perspectives of feature transmission mode, spatial dimension and feature dimension, the improvement directions of convolution neural network structure in recent years were reviewed. The working principles of the convolution layer, pooling layer, activation function and optimization algorith...
2021, 21(4): 48-71. doi: 10.19818/j.cnki.1671-1637.2021.04.003
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Road and railway engineering
Shaking table test of liquefaction resistance of group piles under strong earthquake
FENG Zhong-ju, ZHANG Cong, HE Jing-bin, LIU Chuang, DONG Yun-xiu, YUAN Feng-bin
Abstract: To study the specific manifestation of the improved basic liquefaction resistance of group pile foundation in comparison with that of single-pile foundation under strong earthquake, considering the Haiwen Bridge Project in Hainan Province as an example, a shaking table model test was adopted to exam...
2021, 21(4): 72-83. doi: 10.19818/j.cnki.1671-1637.2021.04.004
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Bearing characteristics of cast-in-place piles with different hole-forming methods before and after grouting in loess area
ZHOU Zhi-jun, XU Tian-yu, XU Fu, CHEN Chao-ran, BAI Yang
Abstract: Static load tests on manual digging piles (MDPs), rotary drilling piles (RDPs), and impact drilling piles (IDPs) before and after grouting were performed to investigate the effect of hole-forming method on the bearing characteristics of cast-in-place piles under post-grouting. The effect of hole-for...
2021, 21(4): 84-93. doi: 10.19818/j.cnki.1671-1637.2021.04.005
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Computational model of outer-circle and inner-ellipse shield tunnel lining structure
GU Shuan-cheng, SUN Guan-lin, SU Pei-li
Abstract: In order to adapt the metro tunnel to the inhomogeneity of stratum load, referring to the structural form of special-shaped shield tunnel lining and taking into account the factors such as production and construction, the outer-circle and inner-elliptic shield tunnel lining structure was proposed, e...
2021, 21(4): 94-105. doi: 10.19818/j.cnki.1671-1637.2021.04.006
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Lateral foundation reaction coefficient of feet-lock pipe in loess stratum
CHEN Li-jun, CHEN Jian-xun, LUO Yan-bin, WANG Chuan-wu, HU Tao-tao
Abstract: A simulated loading test of a feet-lock pipe in the Malan loess stratum was conducted. The proportional coefficient of lateral foundation reaction coefficient of the feet-lock pipe was obtained through the inverse calculation. The variations in the proportional coefficient of lateral foundation reac...
2021, 21(4): 106-115. doi: 10.19818/j.cnki.1671-1637.2021.04.007
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Calculation method of UHPC local compressive bearing capacity
QIU Ming-hong, SHAO Xu-dong, LIU Qiong-wei, YAN Ban-fu, LI Pan-pan, HUANG Zhong-lin
Abstract: To reasonably calculate the local compressive bearing capacity of UHPC members, the local compression test database of UHPCs with and without indirect reinforcement was developed. Based on the database, the calculation formulae of local compressive bearing capacity in codes of NF P 18-710, CECS 38: ...
2021, 21(4): 116-129. doi: 10.19818/j.cnki.1671-1637.2021.04.008
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Comparison of vertical vortex-induced vibration characteristics between semi-open girder and separated edge-boxes open girder
DUAN Qing-song, MA Cun-ming
Abstract: Wind tunnel tests on sectional models with a scale ratio of 1∶50 were performed to comprehensively investigate the vortex-induced vibration characteristics and associated mechanisms of open girders with different cross sections. The vortex-induced vibration characteristics of semi-open girder and se...
2021, 21(4): 130-138. doi: 10.19818/j.cnki.1671-1637.2021.04.009
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Fire resistance performance and design method of steel-concretecomposite continuous curved box girders
SONG Chao-jie, ZHANG Gang, HE Shuan-hai, KODUR V K, HUANG Qiao, LI Xu-yang
Abstract: As a strategy to improve the fire resistant performance of steel-concrete composite continuous curved box girders, a three-span steel-concrete composite continuous curved box girder was selected as a research object to establish a two-stage three-dimensional nonlinear analytical model under fire by ...
2021, 21(4): 139-149. doi: 10.19818/j.cnki.1671-1637.2021.04.010
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Propagation characteristics of initial compression wave in cave and portal micro-pressure waves characteristics when 600 km·h-1 maglev train entering tunnels
MEI Yuan-gui, LI Mian-hui, HU Xiao, DU Jun-tao
Abstract: Based on a three-dimensional numerical simulation method, a one-dimensional compressible unsteady non-isentropic flow model and an improved generalized Riemann variable characteristic line method were developed. The initial compression wave propagation in the tunnel and the micro-pressure wave chara...
2021, 21(4): 150-162. doi: 10.19818/j.cnki.1671-1637.2021.04.011
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Transportation vehicle engineering
Influence of surface micro shot peening on short fatigue crack behavior of CuNi2Si alloy
YANG Bin, FENG Bo, LI Yi-fan, LIAO Zhen, ZHANG Ji-wang, XIAO Shou-ne, YANG Guang-wu, ZHU Tao
Abstract: Under tension-compression loading, the fatigue short crack replica tests of funnel-shaped round bar specimens of CuNi2Si alloy with/without micro-shot peening were carried out, respectively. Tests were interrupted at a series of predetermined load cycles to replicate the surface of the specimen with...
2021, 21(4): 163-171. doi: 10.19818/j.cnki.1671-1637.2021.04.012
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Dynamics modeling of asymmetrical tension and compression characteristics of gas-hydraulic and ring spring combined draft gear and impact simulation
SUN Shu-lei, LI Fu, WANG Guang-chao, TIAN Guo-ying, DENG Peng-yi, MI Cai-ying
Abstract: A dynamics model of a gas-hydraulic and ring spring combined draft gear was established to simulate the asymmetric dynamic tension and compression characteristics of the gear.Based on the characteristics of different energy-absorbing elements, a vehicle impact dynamics model program was compiled usi...
2021, 21(4): 172-182. doi: 10.19818/j.cnki.1671-1637.2021.04.013
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Transportation planning and management
Speed prediction by online map-based GCN-LSTM neural network
CHEN Hua-wei, SHAO Yi-ming, AO Gu-chang, ZHANG Hui-ling
Abstract: Online map speeds of roads were collected by calling the path-planning application programming interface of the online map to completely extract the spatio-temporal features of the road speed from road network speed and then achieve high-precision road speed prediction. The spatial features were ext...
2021, 21(4): 183-196. doi: 10.19818/j.cnki.1671-1637.2021.04.014
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Characteristics of driving speed at tunnel entrance and exit at high speed
XU Jin, ZENG Yue
Abstract: In order to clarify the operating characteristics and driving behavior at the entrance and exit of mountain tunnels and reveal the mechanism of traffic accidents at tunnel portals, three tunnels on expressways and urban express roads were selected, respectively. The spot speeds of passenger cars and...
2021, 21(4): 197-209. doi: 10.19818/j.cnki.1671-1637.2021.04.015
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Subway passenger flow prediction based on optimized PSO-BP algorithm with coupled spatial-temporal characteristics
HUI Yang, WANG Yong-gang, PENG Hui, HOU Shu-qian
Abstract: To improve the accuracy of subway passenger flow prediction, by considering the Xi'an Metro Line 1 as an example, five main factors affecting subway passenger flow variations, such as festival, non-festival, time period, station, and weather, were extracted to analyze the coupled spatial-temporal ch...
2021, 21(4): 210-222. doi: 10.19818/j.cnki.1671-1637.2021.04.016
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Traffic information engineering and control
Multi-task perception algorithm of autonomous driving based on temporal fusion
LIU Zhan-wen, FAN Song-hua, QI Ming-yuan, DONG Ming, WANG Pin, ZHAO Xiang-mo
Abstract: The sequential image frames were used as input to mine the temporal associated information among the continuous image frames, and a multi-task joint driving environment perception algorithm fusing the temporal information was constructed to rapidly detect the traffic participation targets and drivab...
2021, 21(4): 223-234. doi: 10.19818/j.cnki.1671-1637.2021.04.017
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Optimization method of dynamic trajectory for high-speed train group based on resilience adjustment
SONG Hong-yu, SHANGGUAN Wei, SHENG Zhao, ZHANG Rui-fen
Abstract: The dynamic operation process of high-speed train groups was investigated to enhance the autonomy and intelligence of train control, and a distributed information interaction model of high-speed train groups was constructed based on the multi-agent and graph theoretic approaches. A multiobjective op...
2021, 21(4): 235-250. doi: 10.19818/j.cnki.1671-1637.2021.04.018
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Rapid check method for truck loaded with fresh agricultural products on expressway
YAN Sheng-yu, XIAO Run-mou, FANG Yan-ming, WANG Yi-meng
Abstract: To improve the traffic efficiency of trucks loaded with fresh agricultural products (FAPs) and reduce the workload of inspectors at toll stations, a rapid check model for trucks loaded with FAPs based on a laser ranging system was proposed. The characteristics of main types of trucks loaded with FAP...
2021, 21(4): 251-258. doi: 10.19818/j.cnki.1671-1637.2021.04.019
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Effect of fog weather warning system under cooperative vehicle infrastructure on vehicle operating eco-characteristics
WU Yi-ping, LI Hai-jian, ZHAO Xiao-hua, XING Guan-yang, CHEN Yu-fei, FU Qiang
Abstract: To explore the effectiveness of cooperative vehicle infrastructure (CVI) technology on vehicle operating eco-characteristics, a fog weather warning system under CVI condition was built based on the driving simulation experiment platform. The fuel consumption and emission features of driving vehicles...
2021, 21(4): 259-268. doi: 10.19818/j.cnki.1671-1637.2021.04.020
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