Temperature field research on thawing process of Freeze-Sealing Pipe Roof Method in Gongbei Tunnel by in-situ prototype test
HU Xiang-dong
FANG Tao
GUO Xiao-dong
REN Hui
Abstract：Authors carried out an in-situ prototype test and focused on the thawing process and temperature field variations both by naturally thawing and "naturally+enforced" thawing.The results showed that the time of both modes was shorter than that of other conventional freezing applications since the volume of the frozen soil was small.Hence,the enforced thawing by brine at ordinary temperature achieved some good results.What is more,after releasing the thermal insulation curtain in the holly pipe,the thawing rate was high enough so that the enhancing tubes could be turn off.As an important part of the research on the freezing effect of FSPR,this test is the first time to study the thawing rules,which is essential for the subsequent construction.
Keywords：Freezing-Sealing Pipe Roof Method (FSPR)Hong Kong-Zhuhai-Macao Bridge (HZMB)Gongbei Tunnelin-situ prototype testthawing processtemperature field
Publication Date：2017-01-01
Pages：6( 1700-1705 )