Sponsor(s): China Highway & Transportation Society
12 issues per year
China Journal of Highway and Transport , the 1st in the field of road transport, is supervised by China Science and Technology Association and sponsored by Highway and Transportation Society of China. It is the most authoritative academic journal of the highway transportation industry. Launched in 1988, it has been walking in the forefront of road traffic technology development. Its scope covers the achievements in road construction and transportation, including road engineering, bridge and tunnel engineering, traffic engineering, road building and machinery engineering. The journal is included by CA, JST, Pж(AJ), EI, CSCD.
Editor-in-chief: Ma Jian
Research on Evaluation Method of Lining Safety Based on Ultimate Bearing Capacity Curve of Lining Section
China Journal of Highway and Transport,2020,Vol 33,No. 03
Composite lining, which consists of initial support, a waterproof layer, and lining, is the main structural form of mountain tunnels in China. In these tunnels, lining is the key to ensuring long-termsafety in operation. At present, the safety evaluations of lining structures are generally carried out according to the relevant tunnel codes, in which the checking formulas of linings of plain concrete and reinforced concrete are provided, respectively. The lining safety cannot be compared directly through safety factor under certain conditions of sectional internal force. In this study, the current safety evaluation method of lining structure was simplified, and then the concept of the safety envelope of a lining section was proposed. Rhe safety of a lining section could be judged according to whether the internal forces of the lining section were located inside the safety envelope. Furthermore, based on the relationship between safety envelope and ultimate bearing capacity curve, an evaluation method of lining safety by the ultimate bearing capacity curve was proposed. The results show that the safety envelope of lining section can be used to judge the safety simply and intuitively. The state of section internal forces ( M, N) is located at the geometrically similar curve of the ultimate bearing capacity curve around the coordinate origin. The safety factors can be calculated by the geometric relationship of the relevant line segments. The ultimate bearing capacity curve considering the material nonlinearity can avoid some limitations in the comparison of safety factors of linings of both plain concrete and reinforced concretein current codes. These research results are useful for the safety evaluation and lining design theory.
Unconventional Prevention Strategies for Urban Public Transport in the COVID-19 Epidemic: Taking Ningbo City as a Case Study
China Journal of Highway and Transport,2020,No. 03
Confronting the major national epidemic, urban public transport (UPT) system has the dual responsibility of ensuring basic trip and blocking the spread of the epidemic. Facing to the epidemic caused by novel coronavirus pneumonia (COVID-19), UPT system should not only organize effective transport, but also reduce the risk of the spread of the epidemic. Metros and conventional buses are indispensable parts of UPT system, and they also play a very important role in it. Under the urgent outbreaking epidemic, the epidemic prevention strategy of UPT system needs to activate the emergency response mechanism and follow the basic principles of the regional classification prevention and control strategy. It should not only guarantee people’s rigid travel demand, but also it must block the spread of the epidemic, and reduce cross-infection caused by UPT. Finally, the COVID-19 is prevented and controlled by the prevention strategy. In addition to epidemic prevention measures such as body temperature detection, wearing masks, and hand washing and disinfection in the early stages of the epidemic, unconventional and targeted combined epidemic prevention strategies should be adopted for UPT system in combination with local actual conditions and risk assessment levels. On the one hand, (1) for the conventional buses system, the epidemic prevention strategies with recommendations were addressed, namely, a gridding operating strategy, a demand-response operating strategy, and an emergency bus bridging strategy. On the other hand, (2) for the urban rail transit system, the three-level combined epidemic prevention strategies with recommendations were also addressed, namely, a suspension of subway operations strategy, an epidemic prevention strategy of compartment isolation, and a demand-response epidemic prevention strategy. The above-mentioned multiple combined epidemic prevention strategies of conventional buses and urban rail transit need to be dynamically adjusted according to the development of the epidemic situation, and the corresponding level of public transport emergency plan should be activated in time. In practice, the passive defense and active prevention and control need to be combined, and finally, UPT system plays an important role in transportation and emergency-response during the epidemic period.