摘要
针对寒区隧道围岩冻胀变形这一工程难题,通过系统的室内试验研究和理论分析,探究了围岩冻胀变形机理及其影响因素。研究采用高精度低温三轴试验系统,在不同温度、应力和水分条件下,对典型寒区围岩进行了冻胀变形特性测试。研究发现,初始含水率、温度条件、应力状态和水分补给条件是影响冻胀变形的关键因素:当初始含水率从5%增至15%时,最大冻胀变形量可从0.5 mm激增至3.0 mm以上;在开放水分补给系统中,冻胀变形量可达封闭系统的3~5倍;围压从0 MPa增至2.0 MPa时,轴向冻胀变形量可减少60%以上。此外,研究揭示了冻融循环导致围岩强度劣化的规律,25次冻融循环可使岩石单轴抗压强度降低近37%。这些研究成果为寒区隧道的设计、施工和维护提供了重要的理论依据。
This study addresses the engineering problem of frost heave deformation in cold-region tunnel surrounding rock,and through systematic indoor experimental research and theoretical analysis it explores the mechanism of frost heave deformation and its influencing factors.The study uses a highprecision low-temperature triaxial testing system to test the frost heave deformation of typical cold-region surrounding rock under different temperatures,stresses,and moisture conditions.The study finds that the initial water content,temperature conditions,stress state,moisture supply conditions are key factors affecting frost heave deformation,when the initial water content increases from 5%to 15%,the maximum frost heave deformation increase sharply from 0.5 mm to more than 3.0 mm;in an open moisture supply system,the frost heave deformation can reach 3 to 5 times that of a closed system;when the confining pressure increases from 0 MPa to 2.0 MPa,the axial frost heave deformation can reduced by more than 60%.In addition,the study reveals the rules of frost-thaw cycles leading to the degradation of surrounding rock strength,and 2 frost-thaw cycles can reduce the rock’s uniaxial compressive strength by nearly 37%.These research results provide important theoretical basis for the design construction,and maintenance of coldregion tunnels.
作者
郑卜豪
夏才初
曹善鹏
赵京
徐晨
李干
ZHENG Bu-hao;XIA Cai-chu;CAO Shan-peng;ZHao Jing;Xu Chen;LI Gan(Ningbo University Institute of Rock Mechanics,315211,Ningbo,Zhejiang,China;Ningbo Municipal Key Laboratory of Energy Underground Structure,315211,Ningbo,Zhejiang,China;Tongji University School of Civil Engineering,200092,Shanghai,China;Jilin Zhongtie High-speed Highway Co.,Ltd.,130051,Changchun,China)
出处
《建筑技术》
2026年第3期344-347,共4页
Architecture Technology
基金
浙江省自然科学基金重点项目(LZ22E080008)
中国中铁股份有限公司科技研究开发计划项目(2021–重大–19)。
关键词
寒区隧道
围岩冻胀
变形机理
冻融损伤
cold region tunnel
surrounding rock frost heave
deformation mechanism
frost-thaw damage
