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Evaluation Method for Tunneling Stability of TBM Cutterhead

World Journal of Engineering and Technology 2019年第2期7卷 1-9页

作者： Zhaohui Xu Ye Er-ken∙Zha Mu-ti Lin Xue Fengtao Wang Jing Chen Junzhou Huo School of Mechanical Engineering Dalian University of TechnologyDalianChina Ergis River Basin Development Project Construction Management Bureau UrumchiChina School of Navigation and Shipbuilding Engineering Dalian Ocean UniversityDalianChina

In the process of tunneling of tunnel boring machine (TBM), different geological conditions often correspond to different working conditions, and the randomness of geological conditions also causes the order of occurrence of each working condition to be different. Under the conversion of different working conditions, this makes the vibration of different types of cutterheads different. How to choose the appropriate type of cutterhead according to different geological conditions is very important for saving engineering cost and increasing cutterhead life. In view of the above situation, this paper proposes a stability evaluation method during the TBM tunneling process to select the appropriate cutterhead type. Firstly, the corresponding relationship between geology and working conditions is established according to different geological conditions, and the input loads corresponding to geological conditions are obtained. Then, it is substituted into the dynamic model of the cutterhead system, the vibration response boundaries of each degree of freedom are obtained by solving. And the average value of the maximum boundary amplitude of each degree of freedom is taken to represent the extreme vibration of the cutterhead under the corresponding working conditions. Finally, by comparing the fluctuation of the ultimate vibration amplitude of each type of cutterhead in the process of working condition conversion, the results are as follows: when the transition between homogeneous strata and composite strata is normal and there is no large turning and deviation correction, the vibration response of the two-part cutterhead is the smallest, and the two-part cutterhead is the best choice. Otherwise, the five-part cutterhead is the best choice, while the stability of the integrated cutterhead is the worst.

关键词： Cutterhead working condition conversion Stability Type Selection of Cutterhead

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Pressure control strategies in biosafety level-3 large-scale production facilities for animal vaccines

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Biosafety and Health 2020年第3期2卷 124-129页

作者： Lei Liang Xin Feng Yi Li China Academy of Building Research Beijing 100013China

This paper summarized the pressure control methods used in 16 large-scale production facilities in China for vaccines against foot-and-mouth disease virus and highly pathogenic avian influenza *** presented the pressure control modes,with their characteristics,of the"constant supply"mode-variable exhaust air volume system and the"constant supply"mode-constant exhaust air volume *** paper analyzed the influence of common problems(e.g.,pressure reference zero drift,positive pressure reversal and failure to restore the original normal working conditions after working condition conversion)on system stability during pressure control in BSL-3 large-scale production facilities and their solutions,providing references for the design and implementation of similar construction projects under the new situation.

关键词： BSL-3 facility Large scale production working condition conversion Negative pressure Animal vaccine

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