水利水电技术（中英文）2022，Vol.53Issue(3)：176-184,9.DOI:10.13928/j.cnki.wrahe.2022.03.017
寒区隧道孔隙围岩冻胀起裂破坏判据
Fracture criterion of tunnel surrounding rock with pores in cold regions
摘要
Abstract
In order to study the failure criterion of porous surrounding rock of tunnel in cold regions under the action of low tem-perature frost heave,the frost heave force and stress intensity factor of surrounding rock are solved based on frozen rock mechan-ics,fracture mechanics and meso-damage mechanics.The stress corrosion limit of rock instead of fracture toughness is taken as the crack initiation criterion.Under the action of single frost heave,the frost heave failure criterion of surrounding rock is estab-lished for the"main-side branch"pore structure which is prone to frost heave failure;Under the action of continuous frost heave,it is regarded as freeze-thaw cycle,the effect of rock debris loss during the cycle is considered,and the frost heave failure criteri-on of surrounding rock is established.Relying on the verification of the reliability of the instability criterion of a tunnel in a cold region of Tibet,it is found that the stress intensity factor of surrounding rock calculated by traditional fracture mechanics may be quite different from the real value.The above engineering examples are used to analyze the effect of different parameters on the stress intensity factor of surrounding rock.The results show that the stress intensity factor of surrounding rock is proportional to the axis diameter of main hole and water pressure.The growth rate of the stress intensity factor of the former in the initial stage is significantly higher than that in the late stage,while the latter increases almost linearly;It is inversely proportional to the ambient temperature and toughness ratio of surrounding rock,and the effect of temperature on surrounding rock instability is more obvi-ous.The research results can improve the understanding of the frost heave failure characteristics of surrounding rock and improve the theoretical basis for the long-term stability of tunnel engineering in cold regions.关键词
冻胀破坏/毛细冻结/细观损伤力学/"主干-旁枝型"结构/应力腐蚀极限/地下水/寒区隧道多孔围岩/影响因素Key words
frost-heave fracture damage/capillary freezing/meso damage mechanics/main-side branch pore structure/stress corrosion limit of rock/groundwater/porous surrounding rock of tunnel in cold region/influence factor分类
建筑与水利引用本文复制引用
舒佳军,邓正定,伍冰妮..寒区隧道孔隙围岩冻胀起裂破坏判据[J].水利水电技术（中英文）,2022,53(3):176-184,9.基金项目
江西省教育厅科学技术研究项目(GJJ170562) （GJJ170562）
