tunnel roof
4.Application of high dip tunnel for drawing out gas in fully mechanized roof-caving face in No.5 coal mine in Yangquan
7.With the development of transportation rapidly, more and more large section and shallow buried tunnel will be constructed in city. Pipe roof-box jacking method is a kind of trenchless knowledge which has the advantage of little affect on ground activity and environment, especially for the case passing through road with heavy traffic and important zone.
9.In the matter of wind tunnel experiments, the rigid and aeroelastic model for double-slop membrane structures with seal and opening on all sides, or opening a hole suddenly, are designed. The question that the tubes, connected to pressure taps, which measure the wind pressure on both upper and under surface of rigid models, do not influence wind field around building, especially under roof, is solved commendably.
10.The mode number and the frequencies range, which were considered during calculating the wind-induced responses of large cantilevered roof by using the method of frequency domain, were analysed and discussed, according to the results of wind tunnel tests of Bahamas and Guinea stadium grandstand cantilevered roofs, and the rules that RMS displacement and RMS internal force responses under strong wind force changing with participant modes number and frequencies range were obtained, and which could be explained from the point of wind pressure power spectrum densities of the measured points on surface of the roof.
