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黄土是一种典型的结构性土,其特殊的结构性直接影响着黄土的力学性质,为了满足黄土地区地下工程的需求,黄土结构性强度的局部弱化对隧道衬砌内力的影响应给予合理的评价。文中综述了黄土结构性与黄土隧道的研究现状,通过弹塑性有限元法分析了黄土结构强度在不同局部弱化的条件下地下结构内力变化规律。数值计算研究表明:地下结构内力不仅随着黄土结构强度弱化而改变,而且结构强度的弱化区域对隧道衬砌内力的分布有着重要影响。
Loess is a kind of typical structured soil. Its special structure directly affects the mechanical properties of loess. In order to meet the demand of underground engineering in loess area, the influence of local weakening of structural strength of loess on the internal force of tunnel lining should be appraised . In this paper, the research status of loess structure and loess tunnel is reviewed. The variation of internal force of underground structure under different local weakening conditions is analyzed by elasto-plastic finite element method. The numerical calculation shows that the internal forces of underground structures not only change with the weakening of the loess structural strength, but also the weakening of the structural strength has an important influence on the distribution of the internal forces of the tunnel lining.