The effect of weathered granites on the highway tunnel lining
[1]Sun Yanjun,Yang Junsheng,Zhang Jian,et al.The effect of weathered granites on the highway tunnel lining[J].Journal of Zhengzhou University (Engineering Science),2017,38(04):78-83.[doi:10.13705/j.issn.1671-6833.2017.01.013]
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Journal of Zhengzhou University (Engineering Science)[ISSN
1671-6833/CN
41-1339/T] Volume:
38
Number of periods:
2017 04
Page number:
78-83
Column:
Public date:
2017-07-18
- Title:
- The effect of weathered granites on the highway tunnel lining
- CLC:
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- Abstract:
- Weathering action will not only change the mineral composition of rocks,but also cause significant reduction of rock material strength.As the surrounding rock pressure acting on the lining increases,lining cracks could be developed gradually,and lining destruction even occurs if the cracks are not disposed in time.It could bring adverse effect to the tunnel operation safety.In this paper a case history of the highway tunnel which located in weathered granite was presented.The stability of surrounding rock for the XJD tunnel was relatively good and the linings were constructed according to Ⅱ-class tunnel lining design during the excavation process.However,the lining cracks appeared after the tunnel had been established.To analyze the reason,some experiments on the physical and mechanical properties of granites with different weathering degrees had been done through core sampling drilling.The mineral compositions of granites were studied using fully automatic X-ray diffractometer,and rock material strengths were also tested.The mechanical properties of lining for the tunnel buried in granites with different weathering degrees were also analyzed by using numerical simulation method.The result comparison between the numerical simulations and experiments showed that the weathering of granite was the main reason to cause the lining cracks.At last,some corresponding treatment measures for the problem were proposed,which could be used as a reference for the similar projects.
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