TY - JOUR
TI - Study on temperature field of entrance section at high altitude tunnel considering water supply from snowmelt
AU - Niu Guo-Dong
AU - Liu Zhi-Qiang
AU - Li Ning
AU - Zhou Hao-Xuan
AU - Yang Gang
JN - Thermal Science
PY - 2021
VL - 25
IS - 6
SP - 4597
EP - 4604
PT - Article
AB - To explore the influence of snowmelt supply at the entrance section at high  altitude tunnel on tunnel engineering, several indoor model tests were  carried out by setting a water-supply system above the model device for  simulating the actual snowmelt supply environment. The model tests were  based on a project at high altitude tunnel in Qinghai. The varied  characteristics of temperature field in typical cross-sections of tunnel  entrances with and without water-supply condition under freeze-thaw cycles  were analyzed accurately by the model. This study shows that the external  water supply has a great influence on the tunnel entrance. When the  surrounding rock freezes at the tunnel entrance, it first freezes from the  arch, then develops to the side wall, and then spreads to the inverted arch  to form a freezing circle. The faster the freezing development rate is, the  greater the thickness of the freezing ring is under the water-supply  condition. The development of temperature field under water-supply condition  is obviously faster than that under normal condition. The distribution  characteristics of freezing depth in both conditions are the arch is the  largest, the side wall is the second, and the inverted arch is the smallest.  This study can provide a reference for analyzing the process of freezing  injury caused by high altitude snowmelt water supply into tunnel entrances  in western Sichuan.