Theoretical calculation of frost heaving pressure in tunnel surrounding rock during freeze-thaw cycles

被引：6
|
作者：
Liu H. [1 ,2 ]
Zhao Y. [1 ,2 ]
机构：
[1] College of Engineering & Technology, China University of Geosciences(Beijing), Beijing
[2] Key laboratory of Deep Geodrilling Technology, Ministry of Land and Resources, Beijing
来源：
Liu, Hongyan (lhyan1204@126.com) | 1600年 / Central South University of Technology卷 / 51期
基金：
国家重点研发计划;
关键词：
Circular tunnel; Damage elastic modulus; Freeze-thaw cycles; Frost heaving pressure; Frost heaving ratio;
D O I：
10.11817/j.issn.1672-7207.2020.04.019
中图分类号：
学科分类号：
摘要：
The failure of the tunnel lining in the cold region is often caused by the surrounding rock frost heaving, but nearly none of the existing calculation methods of the frost heaving pressure in the tunnel surrounding rock considers the co-effect of the reduction of elastic modulus and the increase of void ratio. Firstly, the elastic mechanical calculation model for the frost heaving pressure in the tunnel surrounding rock proposed by other researchers was introduced. Then, the relationship between the rock elastic modulus and the number of freeze-thaw cycles was set up based on Griffith fracture theory and mesodamage theory. Finally, the damage mechanics calculation method of the surrounding rock frost heaving pressure by considering the change of the rock elastic modulus and void ratio at the same time was proposed. The results show that the surrounding rock frost heaving pressure gradually increases and tends to be constant with the freeze-thaw cycles. It is assumed that the rock frost heaving pressure is mainly caused by the freezing and expansion of the water in the microcracks. So the intercepting and draining water measures which can control the water infiltration into the surrounding rock should be adopted to reduce the frost heaving failure of the surrounding rock. © 2020, Central South University Press. All right reserved.
引用
收藏
页码：1049 / 1058
页数：9
相关论文
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