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Articles

by Xin-Rong Wang
44 Views, 0 PDF Downloads
During the construction and service of high-speed railway slab ballastless track, the structural material parameters may change, which is quite different from its engineering design values. At present, there is still a lack of in-depth research on the impact of this change on the damage of the interface between the track slab and the mortar layer. In this paper, the finite element model of CRTS II slab ballastless track is established. Cohesive force model is used to simulate the damage behavior of the interface. The influence of the elastic modulus of the track slab, the elastic modulus of the mortar layer and the interfacial bonding strength on the damage of the interface between the track slab and the mortar layer under the extreme temperature gradient load of 90 C/m is analyzed. The results show that the influence of elastic modulus of track slab and mortar layer on the interface damage is basically the same. High elastic modulus deteriorates the interface stress and will increase the interface damage degree and damage area. The interfacial bonding strength has a significant effect on the interfacial damage. When the bonding strength is less than its design value, the interfacial damage rapidly deteriorates with the decrease of the bonding strength.
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Articles

by Ming-Liang Li
29 Views, 0 PDF Downloads

This paper introduces the seismic response mechanism of subway stations and the different responses of semi-ground side platform stations under earthquake action, compares different seismic calculation methods, and combines the actual engineering to carry out the reaction displacement and response spectrum of a semi-ground subway station in the 8 degree earthquake-resistant area. Seismic analysis of the method is used to study the seismic response law of the semi-ground side platform subway station, in order to provide a basis for the seismic design of the semi-ground side platform station.

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Articles

by Wenfu Xu
37 Views, 0 PDF Downloads

Review the development background of saturated diving emergency high pressure evacuation technology, and review the main methods and equipment for evacuation under diver pressure. Analyze the current state of high-pressure evacuation technology regulations in the world, and look forward to the application and trend of saturated high-pressure evacuation equipment and standard regulations.

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Articles

by Caiying Liu
32 Views, 0 PDF Downloads

The urban rail transit network command center is a comprehensive operation command and coordination organization based on each line control center, which manages the entire urban rail transit network by exercising the functions of monitoring and dispatching, emergency disposal, operation evaluation, information release, etc. This paper analyzes the key technologies of constructing the information platform of the network command center system, and discusses how to apply these technologies to various scenarios of network command management in order to promote the development of intelligent management and control of urban rail transit.

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Articles

by Yuan Tang
29 Views, 0 PDF Downloads

Discrete speed is an important characteristic index that affects the efficiency and safety of urban expressway. In this paper, the individual vehicle speed data collected by Shanghai license plate recognition system is used, and the vehicle speed variance is used as the characteristic index. The discrete characteristics of vehicle speed and its influencing factors are analyzed under the framework of random basic graph. Through analysis, it is found that the individual vehicle speed variance is larger than the aggregate speed variance, and the overall stability is 5~15km/h. As the density increases, it decreases slightly, and can be divided into stable, decreasing, parabolic, and clustered. The main influencing factors of vehicle speed dispersion are identified by establishing multiple linear regression models, including the number of lanes and the type of ramp. This paper expands the basic graph theory of traffic flow and has reference significance for improving the safety and efficiency of urban expressway.

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