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Analysis of influences of thermal force and freeze-thaw weathering on tunnel

A weathering and tunneling technology, used in tunnels, tunnel linings, analysis materials, etc., can solve the problems of water leakage, freeze-thaw damage, and high tunnel maintenance costs

Inactive Publication Date: 2011-04-27
CHINA RAILWAY 16TH BUREAU GRP CO LTD
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AI Technical Summary

Problems solved by technology

[0002] At an average altitude of 3850m, due to the post-sealing effect of permafrost and thermal weathering, whether it is an operating tunnel or a tunnel under construction, water leakage and freeze-thaw damage often occur in multiple places, and the secondary lining is rebuilt and Tunnel maintenance costs are high

Method used

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Embodiment Construction

[0008] 1. Temperature measurement

[0009] Air temperature causes changes in water temperature and ground temperature. During construction or operation, construction factors such as machinery, personnel, concrete hydration reaction, and tunnel insulation have caused the temperature in the middle section of the tunnel to change repeatedly, which is generally higher than the temperature outside the tunnel, higher than the temperature of seepage water in the surrounding rock, and higher than the temperature of the rock mass. Heat exchange occurs, and the ground temperature undergoes high-frequency and high-amplitude changes above and below the freezing point, creating conditions for thermal weathering and freeze-thaw weathering of surrounding rocks and secondary linings

[0010] The annual change of water temperature in the cave is small, the water temperature is generally between 0 and 5°C, and the difference is generally less than 4°C; the highest water outlet point is generall...

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Abstract

The invention relates to analysis of influences of thermal force and freeze-thaw weathering on a tunnel. The analysis comprises plateau temperature analysis, concrete intensity monitoring, stress section monitoring and frozen-heave force analysis and is characterized in that: during the analysis of the influences of thermal force and freeze-thaw weathering on the tunnel, an external heating and heat preserving measure and an external heating, temperature raising, covering and moisture preserving measure are taken so as to analyze weathering caused by frozen-heave force. Major factors which cause frost heave damage to the tunnel can be determined, frozen earth is protected, water content of a new frozen earth layer is lowered, freezing of leakage water is avoided, tunnel design and construction technology for the Qilian Mountain is promoted effectively, curing cost is lowered and the service life of the tunnel is prolonged.

Description

technical field [0001] The invention belongs to the field of civil engineering, and in particular relates to the analysis of the influence of heat and freeze-thaw weathering on tunnels under construction and in operation. Background technique [0002] At an average altitude of 3850m, due to the post-sealing effect of permafrost and thermal weathering, whether it is an operating tunnel or a tunnel under construction, water leakage and freeze-thaw damage often occur in multiple places, and the secondary lining is rebuilt and Tunnel maintenance costs are high. In order to overcome the effects of freeze-thaw weathering and thermal weathering, avoid the phenomenon of high pressure in the surrounding rock and concrete containing water, and reduce the cost of tunnel maintenance and repair. The analysis and research on the influence of heat and freeze-thaw weathering on tunnels under construction and in operation have been carried out. Contents of the invention [0003] 1. Durin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D9/00E21D11/10G01N17/00
Inventor 刘国玉张军徐存良郭秀琴陈丽敏
Owner CHINA RAILWAY 16TH BUREAU GRP CO LTD
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