Shanghai-Kunming High-speed Railway Research Articles

Evaluation of Sustainable Development Potential of High-Speed Railway Station Areas Based on “Node-Place-Industry” Model

The development of the HSR station area is the result of the combined effect of the three elements of transport, place, and industry. This study introduces the industrial dimension and constructs the node-place-industry model to empirically analyze the development potential of station areas along the Hunan section of the Beijing–Guangzhou and the Shanghai–Kunming high-speed railway lines. The results show that (1) the development of the three spatial elements of the station area is mostly out of sync, and the node value has the highest fit with the integrated potential value of the station area; (2) there is a significant correlation between the magnitude of the combined potential of the station area and the site location, station class and time of development; (3) according to the results of the cluster analysis, it was found that most of the stations were in a state of disequilibrium, and the main reason was that the functional value of the place did not match with the value of industrial aggregation. In particular, the introduction of the industry dimension extends the NP model and establishes a tessellated analytical framework for station type classification, providing an interesting assessment tool for the sustainable development of transport hub areas.

Performance evaluation of a short-distance transition subgrade with pile-plank structures in high-speed railway

ABSTRACT The transition subgrade is widely applied between the general subgrade and rigid structures (such as abutments, culverts, and tunnels) to reduce the degradation rate of track structures in high-speed railways. To address the problem that the common-type transition subgrade cannot be applied in mountainous areas due to the short distance between the tunnel and the subgrade (or abutment), a new type of pile-plank structure (PPS) transition subgrade for short-distance transition was proposed, and the PPS subgrade was successfully applied to a bridge-tunnel transition zone in the Shanghai-Kunming high-speed railway, China. A series of field tests, including vibration acceleration and velocity tests, were carried out in the bridge-tunnel transition zone to evaluate the transition performance of the PPS subgrade using the effective value and power spectral density method. In addition, an FE model that considers the coupled vehicle-track-subgrade-foundation interaction was established to fully reveal the dynamic performance of the PPS subgrade by characterizing the change rate of rail deflection, the dynamic response distribution of the track structure along the transition zone, and the running quality of the train comfort. The results show that the proposed PPS transition subgrade has a good transition performance and meets the requirements for excellent train comfort.

Impact of high-speed railway construction on spatial patterns of regional economic development along the route: A case study of the Shanghai–Kunming high-speed railway

The Shanghai–Kunming high-speed railway spans the eastern, central, and western regions of China and is an important "horizontal" in the "eight vertical and eight horizontal" railway network of China. This paper estimates the direct impact of opening a high-speed railway on the spatial patterns of regional economic development along the route by integrating GIS technology, spatial panel data models, and the entropy method. The results show that the high-speed railway can significantly increase the economic aggregate and urbanization rates along the route and promote the upgrading of industrial structures, but it has a limited effect on the economic growth rate, showing a weak trend. In terms of spatial patterns, the high-speed railway significantly improves regional accessibility, the strength of economic ties, and economic potential along the route. The regional economy is characterized by weak spatial agglomeration and presents a trend of balanced development. In general, although the economic effect of HSR for the economically lagged regions is smaller in the short term than that in the economically and less economically developed regions, the high-speed railway has the greatest impact on regional economic development and spatial patterns in economically backward areas, thus the economically backward regions have a greater posterior advantage, which is conducive to balancing regional economies and narrowing regional differences.

Seismic response of CRTS II ballastless track-bridge system considering the damage of track structure.

Based on the 16-32 m simply-supported beam bridge on Shanghai-Kunming high-speed railway, a collision model of CRTS II track system was established. The model considered the longitudinal, horizontal as well as vertical nonlinear constraints among structural layers, and the Kelvin element was used to simulate the pounding effect of the gaps. The seismic response of the CRTS II track system was firstly analyzed and then the influences of different cases of damaged track plate, base plate, and mortar layer were discussed. The study revealed that: (1) The rail, track plate, and base plate all bear large longitudinal force and their stress envelope curves are all anti-symmetric. (2) The broken track plates result in a sharp decrease in track plate stress and an extreme increase in rail stress and base plate stress near the gap. The broken base plates result in a sharp decrease in base plate stress and an extreme increase in rail stress and track plate stress near the gap. (3) Both the pounding frequency and pounding force between broken slabs are relatively large and will decrease after some time. (4) The broken slabs near ends of the first bridge span greatly increase the pounding force of stoppers close to the abutment. (5) The gap width has a huge influence on the pounding force and times of stoppers and gaps. (6) The debonding of mortar layer has a great influence on the vertical displacement of rail, track plate, and the base plate.

중국 후쿤 고속철도 개통에 따른 사회경제적 영향분석 연구; 구이양시를 중심으로

본 연구는 중국 서남부 지역으로 후쿤(逅昆) 고속철도가 개통되면서 고속철도역이 소재한 도시의 사회경제적 영향을 분석한 논문이다. 중국의 도시 경제성장 속도 1위를 유지하고 있는 구이양(貴陽)시를 연구의 공간적 범위로 하여 고속철도 개통이 구이양(貴陽)시 경제성장에 어느 정도 기여하고 있는 지를 살펴보았다. 본 연구는 구이양(貴陽)시에 고속철도 개통 전 4년, 개통 후 4년과, 그리고 구이양(貴陽)시와 주변에 두 도시인 류판수(六盤水)시와 비제(畢節)시에 대한 데이터 비교 연구를 통해 고속철도 개통이 도시의 사회경제에 미치는 영향을 분석하였다. 후쿤 고속철도가 도시의 인구, 경제, 아파트 가격, 관광산업 등 4가지 측면에 미치는 영향을 분석하였고, 결과적으로 후쿤 고속철도 개통은 구이양(貴陽)시의 경제 발전에 도움이 되었으며, 특히 관광산업에 가장 큰 영향을 미쳤음을 알 수 있다.

Dynamic Response and Stability Analysis of High-Speed Railway Subgrade in Karst Areas

The increase in railway coverage significantly increased the railway mileage in karst areas. However, the fragile ecosystem in karst areas and weak mechanical performance in cavities cause hidden railway safety hazards. Even with the crucial stability and safety of railways in karst areas, there is only limited research conducted on the dynamic response of railway subgrade and the influence of hidden soil holes on the stability under different conditions. In this study, the Guizhou section of the Shanghai–Kunming high-speed railway was chosen as the research area. On-site monitoring and simulations using ABAQUS were performed to study the dynamic response of the subgrade under the dynamic load of a train. The influence of the soil hole, axle load, and vehicle speed on the dynamic response law and stability of the subgrade were considered based on the model rationality verification. Previous studies have demonstrated the considerable impact of soil holes on the dynamic response characteristics and stability of roadbeds. The ambient vibration frequency of the train was concentrated at 10–60 Hz. Under train load, the amplitude of the dynamic response parameters of each subgrade structural layer increased with the axle load; however, the increase in speed exhibited a greater impact on the vertical dynamic displacement and dynamic stress than on the dynamic acceleration, which affected the stability of the soil hole and roadbed. This study summarized the dynamic response characteristics of subgrade in karst areas under different conditions, thereby providing a design reference for high-speed railways in karst areas.

Design and Rapid Construction Technique for Bibanpo High-speed Railway Bifurcation Tunnel

In China, the construction of high-speed railway infrastructure plays a more and more important role in promoting economic growth. However, because of its large turning radius and incapability in bypassing and avoiding, the length of development line cannot meet the needs of separating tunnel, which has driven high-speed railway tunnel bifurcation structure become a necessity in regions with steep high mountains, gorges, ridges and valleys. In the big excavation area of bifurcation transition section, long construction period and collapse of the surrounding rock often happen. To solve those problems, we proposed a new method with rapid holing through procedure and pre-stressed anchor cable support. The methods go as follows. We put forward an optimized process of excavating and breaking through one side of the tunnel first and drilling back through the other side in consideration of the large excavation area and long construction period. We presented reinforced support system of pre-stressed anchor cable in view of problems including surrounding rocks with no secondary lining, unstable structure and unbalanced load releasing. The system has been applied to Bibanpo tunnel, a project in Shanghai-Kunming high-speed railway. By using this method, all difficulties during construction have been broken through, The study could be used as a valuable example for bifurcation structure construction in urban arterial roads and high-speed railway tunnel with the similar geological conditions such as Chengdu-Kunming high-speed railway, Chongqing-Kunming high-speed railway, and Chongqing-Changsha high-speed railway which are going to be constructed.

Design of Magnetic Resonance Sounding Antenna and Matching Circuit for the Risk Detection of Tunnel Water-Induced Disasters

The magnetic resonance sounding (MRS) method can noninvasively, directly, and quantitatively detect groundwater and forecast the potential for a water-induced disaster during tunnel construction. However, due to the spatial limitations of underground engineering, the signal-to-noise ratio (SNR) of the receiving signal is low (<; 1), which severely limits the reliability of the disaster warning. Thus, the question of how to design the meter-scale antenna and improve the SNR has become the bottleneck that restricts the successful application of the underground MRS method. To address this problem, we comprehensively consider the factors of detection depth, signal amplitude, and antenna size and weight using theoretical calculations and model simulations in this paper. We determine that an 8-turn transmitting antenna and a 30-turn receiving antenna with both side lengths of 6 m constitute an effective combination for achieving reliable detection of large water-bearing structures. Meanwhile, we propose a front-end matching circuit for a high-inductance antenna to solve the problem of attenuation of the signal amplitude due to high impedance and successfully increase the SNR from 1.12 to 5.13. Finally, in the tunnel of the Shanghai-Kunming high-speed railway of China, we perform the field measurement of an underground river and validate the practicability of the proposed antenna and matching circuit.

Research on the Influence of Shanghai-Kunming High-speed Railway on the Economics of Cities along the Line Based on Optimized Gravity Model

With the continuous growth of the demand for inter-regional personnel exchanges between modern social and economic development, high-speed railways, as a modern means of transportation that combines various high-tech, play an important role in meeting the high demand for mobility among regions and promoting social development. Among them, Shanghai-Kunming high-speed railway, as an important part of China’s high-speed railway network, deserves in-depth study. In this paper, the city quality is obtained by comprehensive evaluation of cities along the line by entropy method. The time distance is used to replace the spatial distance. The gravitational model of the city is optimized, and the gravitational change between cities along the line before and after the opening of the Shanghai-Kunming high-speed railway is more scientifically described. Finally, the paper proposes that the opening of the Shanghai-Kunming high-speed railway can effectively promote the economic development of cities along the line, especially the rapid rise of western cities.

Case Study of Twin Cable-Stayed Bridges for High-Speed Railway in China: Design, Analysis and Construction

The construction of twin cable-stayed railway bridges was undertaken near Changsha station of the Shanghai–Kunming high-speed railway (HSR) in China. Because of the inevitability of crossing the existing Wuhan–Guangzhou HSR line, the swing method was chosen so that the construction process does not interrupt the operation of the existing line. The objective of this study is to highlight the features of two cable-stayed bridges. Key structural components along with structural dimensions are discussed. Key issues associated with the structural design are analyzed, including the pylon–girder joint behavior, solar radiation temperature mode of through girder, track–bridge behavior, and the aerodynamic effects induced by high-speed trains. Finally, a brief account of the construction is given. The use of the swing method proved to be an effective solution to span existing HSR lines.

Comprehensive Prediction of Rockburst in High-Speed Railway Tunnel

Dayanwan tunnel in Shanghai-Kunming high-speed railway is deeply buried and its rock lithology is brittle and hard. The typical tunnel cross section was selected to do hydraulic fracturing field geostress test. The stress in the measured depth was obtained. In order to forecast the rock burst in the whole tunnel, the finite element inversion method has been used based on field geostress test. Lastly, the stress conditions, lithology, structure characteristics and groundwater conditions of surrounding rock were made as the general conditions to predict the rock burst comprehensively in Dayanwan tunnel. The results show this comprehensive prediction method is more accurate than the single rock burst prediction method used before. And it has a certain guiding significance in practice.

Application Analysis of Comprehensive Advanced Geological Prediction in Karst Tunnel

Based on the DaDu mountain tunnel of new construction ShangHai-KunMing high-speed railway, combine with field geology investigation of the tunnel address area comparative analysis TRT advanced geological prediction, infrared probe water, ground penetrating radar advance geological forecasting and tunnel design data, aimed at fault fracture zone, high-pressure water-rich belt, the karst fissures developmental situation may have in construction period of DaDu mountain tunnel, carried out the comprehensive advanced geological prediction and then combined with the actual excavation situation contrast and verify the feasibility and practicality of the comprehensive geological advanced prediction technology, and it will have important significance of reference for the similar tunnel project in design and construction period.