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  • 1
    Publication Date: 2018-08-04
    Description: In order to improve the accessibility of urban agglomerations traffic network, the accessibility of urban agglomeration compound traffic network was empirically studied from a new view. A quantitative description of the accessibility of urban agglomeration was put forward by weighted travel time, weighted economic potential, and interaction force. Firstly, four single mode of transport sub-networks was built, including highway sub-network, rail sub-network, aviation sub-network and waterway sub-network so that urban agglomeration compound traffic network was formed by the superposition based on complex network theory. Secondly, the effective average travel time, city economic coefficient was chosen as quantitative measure index of accessibility. Finally, the model of Hohhot-Baotou-Ordos urban agglomeration compound traffic network was built to be empirically studied. The results show that it formed a structure of concentric circle with the center of Baotou and the accessibility ...
    Print ISSN: 1757-8981
    Electronic ISSN: 1757-899X
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 2
    Publication Date: 2018-08-04
    Description: Aiming at the interaction intensity problem of cities in urban agglomeration, the gravity model of interaction among cities in urban agglomeration is set up to find the influence factors of the interaction and put forward the efficient method to promoting the interaction among cities in urban agglomeration. Firstly, analyzing the manifestation of the interaction and introducing traditional gravity model. Then, improving the city quality and distance measurement method and determine model. In the end, the interaction among cities in HuBaoOr urban agglomeration is obtained based on related data. The result indicated that with the repaid development of society, economic, transportation and communication, the contact of cities has been strengthened and the space interaction also increasing. The interaction is the requirement of cities’ normal operation and it also is the foundation of cities to achieve mutual benefit and seek further professional development. In this way, the resear...
    Print ISSN: 1757-8981
    Electronic ISSN: 1757-899X
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 3
    Publication Date: 2020-09-10
    Description: To overcome the problems of poor cutting effects in hard rock roadways, a cut blasting technique with large diameter charges was developed; that is, the cut holes employ 50 mm diameter blast holes and 45 mm diameter explosive sticks, while the other holes adopt 42 mm diameter blast holes and 35 mm diameter explosive sticks. First, the effect of charge diameter on damage range and cut cavity formation was analyzed. Next, simulation of wedge cut for different charge diameters was conducted to reveal the stress wave developments and compare the stress field intensities. Finally, field tests were conducted to verify the viability of this technique. The results indicate that large diameter charges can increase the damage range around cut holes to improve the fragmentation degree of the rock mass in the cut cavity and significantly enhance the cavity formation power to better expel the rock mass fragments. The stress wave evolution of wedge cut was visualized using numerical simulations, which confirmed that the use of large diameter charges in cut holes increases the stress field intensity in the cut cavity and hence increases the damage degree of the rock mass. In this study, the use of a large diameter charge for cut blasting increased the average footage by 0.30 m, and the average utilization rate of blast holes increased by 12.5%. Therefore, the cutting effects in hard rock roadways can be improved by using large diameter charges, which increase the blasting footage and the utilization rate of blast holes.
    Print ISSN: 1687-8086
    Electronic ISSN: 1687-8094
    Topics: Architecture, Civil Engineering, Surveying
    Published by Hindawi
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