Open AccessStudy on temperature field of entrance section at high altitude tunnel considering water supply from snowmelt
Author(s) -
Guodong Niu,
Zhiqiang Liu,
Ning Li,
Haiyan Zhou,
Gang Yang
Publication year - 2021
Publication title -
thermal science/thermal science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.339
H-Index - 43
eISSN - 2334-7163
pISSN - 0354-9836
DOI - 10.2298/tsci2106597n
Subject(s) - snowmelt , arch , environmental science , altitude (triangle) , geotechnical engineering , water tunnel , water supply , meteorology , geology , snow , geomorphology , structural engineering , engineering , physics , environmental engineering , mathematics , geometry , vortex
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.