|Table of Contents|

Law of thermal thaw of highway tunnel portal in Permafrost Region(PDF)

长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2020年6期
Page:
86-96
Research Field:
桥梁与隧道工程
Publishing date:

Info

Title:
Law of thermal thaw of highway tunnel portal in Permafrost Region
Author(s):
FU Zhipeng;  LI Borong;  HAN Changling;  DONG Changsong
（Shaanxi Key Laboratory of Road Disaster Prevention， CCCC First Highway ConsultantsCo., Ltd., Xian 710065, Shaanxi, China）
Keywords:
tunnel engineering;  frozen soil area;  numerical analysis;  law of heat melting;  heat of hydration;  thermal parameter
PACS:
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DOI:
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Abstract:
In order to clarify the law of thermal melting in the portal section under the joint influence of geological, environmental, climate and construction excavation, and further improve the prevention and control technology of thermal melting stability in the front slope of the portal section of highway tunnels in cold regions, based on the Jiangluling Tunnel of Gongyu (Gonghe to Yushu) Expressway in Qinghai Province, through onsite monitoring, numerical simulation and theoretical analysis, the temperature response process in the tunnel portal section was analyzed. Based on the simulation results of the temperature field, the main factors affecting the slope and the range of the thermal fusion in the tunnel were analyzed, and the method of controlling the temperature field was determined. The results show that the temperature change in the shallow soil layer on the slope has a certain lag, compared with the surface, which is proportional to the depth, the solar radiation has a huge impact on the thermal melting of the slope at the entrance of the supporting project, even on the shady slope, it is necessary to take some sunshade measures to reduce the thermal melting of the frozen soil, the growth and development of the melting circle of the surrounding rock in the tunnel before the secondary lining speed is fast. Before the construction of the first lining, the surrounding rock thermal melting circle has formed a large scale, and very unfavorable to the stability of the tunnel which has not been strongly supported, so we should pay attention to the thermal insulation measures in the tunnel before the construction of the second lining. During the construction and excavation stage, the influence of the slope thermal melting on the surrounding rock thermal melting in the tunnel decreases rapidly with the increase of the tunnel buried depth, and pay attention to the burial influence of the thermal melting range of the surrounding rock of the deep and extra shallow section vault, especially the prevention of the largescale thermal melting through phenomenon. 11 tabs, 8 figs, 28 refs.

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Last Update: 2020-12-17