|
|
|
| INFLUENCE OF HEAT DISSIPATION OF MAIN TUNNEL STRUCTURE ON FREEZING EFFECT IN CROSS PASSAGE CONSTRUCTION |
|
|
|
Abstract Heat dissipation of tunnel segments can seriously weaken the freezing effect of the soil near the segments in cross passage construction by artificial freezing method. Based on the field monitored temperature data，a study is conducted to investigate the influence of segments heat dissipation on the development of temperature field. The result shows that the influence of heat dissipation is significant both on the temperature field and the thickness of frozen soil wall，both of which are seriously weakened，and that causes a large gap at the opening of the cross passage compared with the uninfluenced area. The thickness of the frozen soil wall in the influenced area at worst just is half of that in the uninfluenced area，which is very dangerous for construction. With the continuation of freezing，the temperature field in the influenced area gradually reaches an equilibrium state of heat exchange，and the temperature changes little even if the freezing time is prolonged，which only lowers the temperature and improves the thickness of the frozen soil wall of uninfluenced area. On the basis of analysis above，the process of frozen soil wall development is plotted. At last，some suggests are brought forward to guide construction of similar projects.
|
|
Received: 10 February 2009
|
|
|
|
| [1] |
CHEN Jianbing1, 2, WANG Pan1, 2, 3*, JIN Long1, 2, DONG Yuanhong1, 2, ZHANG Qi1, 2, WANG Xiaochan4, WANG Zhixuan3. Shear and volumetric creep deformation characteristics and constitutive model of frozen clay under temperature effect[J]. , 2026, 45(5): 1538-1553. |
|
|
|
|
