Study on the distribution law of freezing temperature field at the interface between frozen soil and pipe segment in super large diameter tunnel connecting channel
This study investigates the freezing temperature field at the interface between soil and pipe segment in a super large diameter tunnel connecting channel with the background of frozen construc-tion in the shield segment of the Beijing East 6th Ring Road Tunnel.Through field measurements and numerical simulations,the development of the frozen wall at the interface and the impact of the non-circulating length of the frozen pipe end on the interface freezing are analyzed.The results demonstrate that the temperature changes in numerical simulation at the same location are basically consistent with engineering measurements,effectively reflecting the temperature changes in the soil.During the freez-ing process,the thickness of the frozen wall at the interface is smaller compared to another section farther from the pipe segment,and with the increase of freezing time,the thickness difference of the frozen wall at the two sections gradually increases.By the time of freezing at 56 d,the thickness difference of the freezing wall reaches 1.04 m,and the sidewall difference of the freezing wall reaches 0.91 m.The non-circulating length of the frozen pipe significantly affects the freezing effect at the in-terface;At 56 d of freezing,for a non-circular section,with an average increase of 100 mm in length,the thickness of the freezing wall at the interface will decrease by 80 mm,and the sidewall thickness will decrease by 60 mm.The research findings can serve as a reference for similar large diameter tun-nel connecting channel freezing projects.
freezing methodlarge-diameter tunnelinterface temperature fieldconnecting channelnu-merical simulation
万方数据
维普
