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The effect of seismic action on stability of saline soil subgrade in cold region based on isothermal stratification method

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Earthquake Research Advances 2024年第3期4卷 66-81页

作者： Jie Cheng Yu Zhang Ying Ma Xuerui Chen Ning An School of Traffic and transportation Lanzhou Jiaotong UniversityLanzhou730070China key laboratory of railway Industry of plateau railway transportation intelligent management and control Lanzhou Jiaotong UniversityLanzhou730070China Gansu Institute of Engineering Geology Lanzhou730030China

With the change of seasons, the shear strength of saline soil subgrade filler will change with the change of external temperature, which will aggravate the adverse effects of seismic on the subgrade. To explore the influence of seismic action on the stability of saline soil subgrade under the influence of temperature on the strength of saline soil subgrade filler, this paper first carried out saline soil shear tests at different temperatures to obtain the influence of temperature on the shear strength of saline soil. Then, the temperature field of the saline soil subgrade was simulated, and then based on the subgrade isothermal stratification model and FLAC3D, the displacement and acceleration amplification effects of seismic action on the shady slope, sunny slope and subgrade of saline soil subgrade in different months were analyzed. The following conclusions were finally drawn: under the action of seismic, In the process of the change of subgrade temperature of Qarhan-Golmud Expressway between 7.7°C and 27°C, the change of saline soil cohesion is the main factor affecting the stability of subgrade slope, and the maximum and minimum values of subgrade surface settlement appear in September and June of each year,respectively. In August, the differences of settlement between the shady slope and the sunny slope shoulder of the subgrade were the largest, and the acceleration of the shady slope and the sunny slope and the inside of the subgrade changed most significantly in the vertical direction. Special attention should be paid to the seismic early warning in the above key months;In the range from both sides of the shoulder to the centerline of the roadbed,the acceleration amplification effect starts to increase significantly from about 3m from the centerline of the roadbed to the centerline, so it is necessary to pay attention to the seismic design of this range.

关键词： Subgrade stability Saline soils Acceleration amplification effect Seismic design

Identification and hazard analysis of landslides triggered by earthquakes and rainfall

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Earthquake Research Advances 2024年第3期4卷 42-54页

作者： Lei Li Yu Zhang Yunlong Hou Bingbing Han Ning An Hui Zhang Ying Ma School of Traffic and transportation Lanzhou Jiaotong UniversityLanzhou730070China key laboratory of railway Industry on plateau railway transportation intelligent management and control Lanzhou Jiaotong UniversityLanzhou730070China Gansu Institute of Engineering Geology Lanzhou730030China School of Civil Engineering Lanzhou Jiaotong UniversityLanzhou730070China

This study aims to utilize the Small Baseline Subset Interferometric Synthetic Aperture Radar(SBAS-In SAR)technique and Google Earth optical remote sensing images to analyze the area within 20 km around the epicenter of a M 3.9, earthquake that occurred in Tanchang County, Gansu Province, on December 28, 2020. The objective is to identify potential earthquake-induced landslides, assess their scale, and determine their impact range. The study results reveal the successful identification of two potential landslides in the 20 km radius around the epicenter. Through time-series deformation analysis, it was observed that these potential landslides were significantly influenced by both the earthquake and rainfall. Further estimation of these potential landslides indicates maximum depths of 7.4 m and 14.1 m for the failure surfaces, with volumes of 9.02 × 10~4m~3and 25.5 ×10~4m~3, respectively. Finally, based on the simulation analysis of Massflow software, the maximum thickness of soil accumulation in the final accumulation area after sliding of the potential landslide in Shangyaai is 12 m, the area of the final accumulation area is 1.75 × 10~4m~2, and the farthest movement distance is 1124 m. The maximum thickness of soil accumulation in the final accumulation area after sliding of the potential landslide in Wangshancun is 8 m, the area of the final accumulation area is 7.89 × 10~4m~2, and the farthest movement distance is 742 m.

关键词： SBAS-InSAR technology Earthquake Deformation monitoring Landslide Massflow Hazard analysis

A VNS-NPGA Approach to Multi-Objective Optimization of Hub-and-spoke Logistics Network

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Journal of Traffic and transportation Engineering(English Edition) 2024年

作者： Changxi Ma Chuwei Shi Yun Yang Yongpeng Zhao Zhuye Xu Bo Du School of Traffic and transportation， lanzhou jiaotong university key laboratory of railway lndustry on plateau railway transportation intelligent management and control， lanzhou jiaotong university School of Tourism and management， Yangling Vocational and Technical College School of New Energy and Power Engineering， lanzhou jiaotong university National Engineering Research Center of Highway Maintenance Technology， Changsha university of Science & Technology SMART Infrastructure Facility， university of Wollongong

To realize low-cost freight transport in the logistics network and improve the network operation efficiency， a multi-objective optimization model and the corresponding algorithm for a hub-and-spoke logistics network are proposed based on the multi-level location of hub points and channels layout. By considering the structure of the multi-level hub-and-spoke logistics network and the features of the connectivity between the hub and spoke points， the multi-objective optimization model is constructed with two objectives of minimizing the total network operation costs and the total network service time. By considering the characteristics of decision variables and models， a Variable Neighborhood Search (VNS)-Niched Pareto Genetic Algorithm (NPGA) approach with a three-stage encoding structure chromosome is proposed， where the VNS algorithm nested in NPGA is used for individual variable neighborhood search to optimize individual channel level genes， and NPGA is adopted to solve the multi-objective optimization model. To evaluate the performance of the proposed VNS-NPGA approach， a real-life case study based on a small-scale Australia Post data set was conducted， and 25 nodes of the Australia Post and 14 nodes of the Gansu Province 3-level hub-and-spoke logistics networks were established， respectively. The analysis results indicated that the network structure of multi-level hub points could avoid the detour problem existing in the traditional hub-and-spoke network， and showed better applicability in the narrow geographical structure. Compared to the traditional multi-objective evolutionary algorithms， VNS-NPGA can obtain better solutions through the distributed optimization of channel levels， avoiding the problem that a single algorithm cannot effectively deal with coupling relationships in genes.

关键词：

Complex Dynamical Behaviors in a Dual Channel Supply Chain Model with Retailer's Service Input

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Journal of Systems Science & Complexity 2023年第3期36卷 1144-1168页

作者： ZHANG Yapeng ZHOU Wei School of Mathematics and Physics Lanzhou Jiaotong UniversityLanzhou 730070China School of Traffic and transportation Lanzhou Jiaotong UniversityLanzhou 730070China key laboratory of railway Industry of plateau railway transportation intelligent management and control Lanzhou 730070China

Based on bounded rationality,this paper established a price game model of dual channel supply chain composed of manufacturers and *** to the eigenvalue of Jacobi matrix and Jury criterion,the stability of the equilibrium point is analyzed,and then the dynamic evolution process under the parameters of price adjustment speed and retailer's service input is studied through stability region,bifurcation diagram,maximum Lyapunov exponent diagram and attraction *** results show that the system enters chaos through flip and Neimark-Sacker bifurcation,and increase of price adjustment speed and service input value will make the system produce more dynamic *** addition,it can be found that the impact of service input value on itself is much greater than that on ***,when adjustment speed is selected as bifurcation parameter,the change curve of sales price is inconsistent,in which the change of retailers mainly remains in periodic state,while manufacturers will gradually enter ***,studies the evolution of attraction basin in which three kinds of attractors *** particular,coexistence of boundary attractors and internal attractors increases the complexity of ***,enterprises need to carefully adjust parameters of the game model to control the stability of system and maintain the long-term stability of market competition.

关键词： Bifurcation analysis boundary equilibrium coexistence of attractors flip bifurcation global bifurcation

An overview of Hadoop applications in transportation big data

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Journal of Traffic and transportation Engineering(English Edition) 2023年第5期10卷 900-917页

作者： Changxi Ma Mingxi Zhao Yongpeng Zhao School of Traffic and transportation Lanzhou Jiaotong UniversityLanzhou 730070China key laboratory of railway lndustry on plateau railway transportation intelligent management and control Lanzhou Jiaotong UniversityLanzhou 730070China Gansu Highway Traffic Construction Group Co. Ltd.Lanzhou 730000China

As an open-source cloud computing platform,Hadoop is extensively employed in a variety of sectors because of its high dependability,high scalability,and considerable benefits in processing and analyzing massive amounts of ***,to derive valuable insights from transportation big data,it is essential to leverage the Hadoop big data platform for analysis and *** summarize the latest research progress on the application of Hadoop to transportation big data,we conducted a comprehensive review of 98 relevant articles published from 2012 to the ***,a bibliometric analysis was performed using VOSviewer software to identify the evolution trend of ***,we introduced the core components of ***,we systematically reviewed the98 articles,identified the latest research progress,and classified the main application scenarios of Hadoop and its optimization *** on our analysis,we identified the research gaps and future work in this *** review of the available research highlights that Hadoop has played a significant role in transportation big data research over the past ***,the focus has been on transportation infrastructure monitoring,taxi operation management,travel feature analysis,traffic flow prediction,transportation big data analysis platform,traffic event monitoring and status discrimination,license plate recognition,and the shortest ***,the optimization framework of Hadoop has been studied in two main areas:the optimization of the computational model of Hadoop and the optimization of Hadoop combined with *** research results have been achieved in the field of transportation big ***,there is less systematic research on the core technology of Hadoop,and the breadth and depth of the integration development of Hadoop and transportation big data are not *** the future,it is suggested that Hadoop may be combined with other big data frameworks such a

关键词： Information technology transportation big data Hadoop intelligent transportation Cloud computing

A review of vehicle speed control strategies

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Journal of Intelligent and Connected Vehicles

Journal of intelligent and Connected Vehicles 2023年第4期6卷 190-201页

作者： Changxi Ma Yuanping Li Wei Meng School of Traffic and transportation Lanzhou Jiaotong UniversityLanzhou 730070China key laboratory of railway Industry on plateau railway transportation intelligent management and control Lanzhou 730070China Gansu Longyuan Information Technology Co. Ltd.Lanzhou 730070China

Currently,traffic problems in urban road traffic environments remain severe,traffic pollution and congestion have not been effectively improved,and traffic accidents are still *** traffic signal control methods have little effect on these *** the continuous improvement of communication technology and network connections,vehicle speed guidance provides a new idea for solving the above problems and has gradually become a popular topic in academic ***,its generalization has ***,this paper summarizes the research on vehicle speed control strategies in urban road environments and provides suggestions for future *** this paper,we summarize the existing research in four ***,we categorize existing research based on vehicle ***,the vehicle speed guidance problem is divided according to the problem research ***,we summarize the existing literature regarding vehicle ***,we summarize the methods used for speed *** an analysis of the existing literature,it is concluded that there is a deficiency in the existing research,and suggestions for the future of vehicle speed guidance research are suggested.

关键词： speed guidance vehicle control vehicle trajectory planning intelligent transportation

Stability of loess high-fill slope based on monitored soil moisture changes

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Research in Cold and Arid Regions 2023年第4期15卷 191-201页

作者： XueLing Yong Yu Zhang YunLong Hou BingBing Han Ning An Hui Zhang Ying Ma School of Traffic and transportation Lanzhou Jiaotong UniversityLanzhouGansu 730070China key laboratory of railway Industry of plateau railway transportation intelligent management and control Lanzhou Jiaotong UniversityLanzhouGansu 730070China Gansu Institute of Engineering Geology LanzhouGansu 730030China School of Civil Engineering Lanzhou Jiaotong UniversityLanzhouGansu 730070China

This paper aims to assess the influence of moisture content changes during rainfall on the stability of loess high-fill slopes by taking a loess high-fill slope in lanzhou City as an ***,according to the moisture content monitoring data collected from a slope online monitoring system,direct shear tests were performed on soil samples of different moisture content to determine the relationship between the shear strength parameters and moisture ***,a coupled hydro-mechanical model with soil shear strength related to moisture content was established and used to analyze 16 working conditions with various rainfall intensities and durations for two cases:shear strength parameters from the site exploration report and those from this ***,the results from the two cases were compared regarding the changes in stresses and displacements after rainfall infiltration to analyze the influence of moisture content on the stability of loess high-fill *** conclusions are as follows:(1)Segmental relationship equations of cohesion and angle of internal friction were established for loess with various moisture content.(2)Under the conditions of different rainfall intensities,significant differences were observed in the trends of slope stress and displacement changes.(3)The slope displacement occurred in the shallow soil layer within about 12.5 m from the slope top,and the plastic strain concentrated in the soil layer within about 6 m from the slope top.(4)The results of slope stability analyses based on moisture content monitoring data are more in line with the observed.

关键词： Rainfall infiltration Seepage stress coupling Loess High fill slope Stability