考虑围岩不均匀冻胀的寒区隧道冻胀力解析解

doi:10.13722/j.cnki.jrme.2014.0830

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摘要

为防止冻害，寒区隧道的设计需考虑冻胀力荷载。阐明寒区隧道围岩的不均匀冻胀性，推导考虑围岩不均匀冻胀性的寒区圆形隧道冻胀力解析解。围岩不均匀冻胀系数k = 1时，本文解退化为赖远明围岩均匀冻胀时的弹性解。理论分析和计算分析表明，围岩均匀冻胀情况下，圆形隧道衬砌不会受到冻胀力作用。赖远明算例中计算得到冻胀力，是由于其采用的冻结围岩弹性模量小于未冻结围岩弹性模量，这与工程实际情况相反。其他冻胀力解析解采取了特殊的假定，而这些假定与工程实际情况相差较大，造成了计算所得冻胀力偏大。围岩不均匀冻胀性是引起寒区隧道围岩中冻胀力的重要原因，在合理的围岩弹性模量和不均匀冻胀系数取值范围内，解析解的计算结果和实际情况吻合较好。随着围岩不均匀冻胀系数k的增大，衬砌受到冻胀力作用，冻胀力的量值随k值增大而增大。当k值一定，冻胀力与冻结围岩弹性模量与未冻结围岩弹性模量的比值E_II/E_III呈反比线性关系。

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	黄继辉1
	夏才初1
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	韩常领3
	黄曼2

关键词 ：岩石力学, 寒区隧道, 不均匀冻胀, 冻胀力, 解析解

Abstract：

Frost heave force should be considered when designing a cold-region tunnel，so as to prevent frost damage. The anisotropic frost heave of surrounding rock of cold region tunnel is described. The analytical solution for the frost heave force of a cold-region tunnel is derived using the non-uniform frost heave coefficient k，in which the anisotropic frost heave expansion is considered. When k = 1，the frost heave expansion is isotropic，and the analytical solution derived in this paper is equivalent to LAI Yuanming¢s solution. Theoretical analyses and calculation analyses show that，there is no frost heave force on the circular tunnel liner if the frost heave expansion is isotropic. The example given by LAI Yuanming¢s paper presents a frost heave force，in which the elastic modulus of the frozen surrounding rock in the example is smaller than the modulus of unfrozen surrounding rock，which contradicts with the actual situation. The assumptions of the frost heave behavior in other analytical solutions are not in accordance with the actual situation，causing the overestimation of the frost heave force. The anisotropic frost heave of surrounding rock is an important reason causing the frost heave force on cold region tunnel. When the values of the surrounding rock modulus and the non-uniform frost heave coefficient are within their reasonable value ranges，the results of present solution agrees well with the actual situation. As k gets bigger，the liner would be pressed by the frost heave force，and the value of the force increases simultaneously with k. When the value of k is determined，the frost heave force is in inverse linear relationship with the elastic modulus ratio of the frozen and non-frozen surrounding rock E_II/E_III.

Key words： rock mechanics cold region tunnel anisotropy frost heave frost heave force analytical solution

引用本文:

黄继辉1，夏才初1，2，韩常领3，黄曼2. 考虑围岩不均匀冻胀的寒区隧道冻胀力解析解[J]. 岩石力学与工程学报, 2015, 34(S2): 3766-3774.
HUANG Jihui1，XIA Caichu1，2，HAN Changling3，HUANG Man2. ANALYTICAL SOLUTION OF FROST HEAVE FORCE ACTING ON COLD-REGION TUNNEL LINER CONSIDERING ANISOTROPY FROST HEAVE OF SURROUNDING ROCK. , 2015, 34(S2): 3766-3774.

链接本文:

https://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2014.0830 或 https://rockmech.whrsm.ac.cn/CN/Y2015/V34/IS2/3766

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