冻融循环条件下寒区隧道围岩冻胀力分析  

Frost Heaving Force Analysis of Surrounding Rocks of Tunnels in Cold Regions under Freeze-thaw Cycles

作　　者：崔晋春 CUI Jinchun(Shanxi Lihuo Expressway Co.,Ltd.,Changzhi,Shanxi 042100,China)

机构地区：[1]山西黎霍高速公路有限公司,山西长治046000

出　　处：《山西交通科技》2024年第4期72-78,共7页Shanxi Science & Technology of Transportation

摘　　要：围岩冻胀力是寒区隧道冻害的外力根源,现有冻胀力计算方法忽略了冻融循环作用对岩石力学参数的劣化影响,难以分析冻融循环条件下寒区隧道围岩冻胀力的变化趋势。基于此,构建冻结状态下围岩冻胀力理论模型,提出考虑岩石裂隙内部水分迁移的微裂纹扩展长度计算表达,修正岩石弹性模量和冻胀率与冻融循环次数之间的关系式,建立考虑冻融循环条件的寒区隧道围岩冻胀力理论解。结果表明:随着冻融循环次数增加,寒区隧道围岩冻胀力不断增大且逐渐趋于稳定值,相比已有理论解,围岩冻胀力分析方法更合理。研究成果对寒区隧道工程的建设与安全运营具有重要的理论价值。Frost heaving force of the surrounding rock is the root of the external force of tunnels'frost damage in cold regions,and the existing calculation method neglects the deterioration effect of freeze-thaw cycles on the mechanical parameters of the rock and is difficult to analyze the variation trend of the frost heaving force under the freeze-thaw cycles.On this basis,this paper built the theoretical model of the frost heaving force of surrounding rock at the frost state,proposed calculation formulas for the micro-crack expansion length considering the water migration inside the rock cracking,modified the correlations between the rock elastic modulus,frost heaving rate and number of freeze-thaw cycles,and established the theoretical solution of frost heaving force of surrounding rock of tunnels in cold regions considering freeze-thaw cycles.The results showed that with the increasing number of freeze-thaw cycles,the frost heaving force continuously increased and tended to be stable,and the analysis method in this paper is more reasonable than the existing theoretical solutions.The study results can provide vital theoretical references for the construction and safety operation of tunnel engineering in cold regions.

关 键 词：冻融循环 寒区隧道 冻胀力 弹性模量 冻胀率 

分 类 号：U451.2[建筑科学—桥梁与隧道工程]