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本文详细地探讨了非粘结性土壤地层中圆形隧道周围的地层性状,包括初始弹性响应、中间屈服和最终坍塌。对各种不同的隧道性状的模式进行了判别,并采用解析法对其出现的条件进行评价,而且将其结果与有限元分析、模型试验和现场量测的结果进行比较。把地层收敛曲线作为一种分析手段用来解释地层对隧道工程的响应,结果表明这种方法可定量地把作用在衬砌上的压力发展同隧道边墙位移联系起来以建立地层性状的全谱。因此,为控制衬砌压力或地层位移提供了一个最佳的设计方法。最后还指出了目前常用的衬砌设计模型的有效性和局限性。
This paper discusses in detail the stratigraphic properties around circular tunnels in non-cohesive soil formations, including initial elastic response, intermediate yielding and final collapse. Different modes of tunnel traits were discriminated, and their conditions were evaluated by analytic method. The results were compared with the results of finite element analysis, model tests and field measurements. The stratigraphic convergence curve is used as an analytical tool to explain the response of the formation to the tunneling project. The results show that this method can quantitatively associate the pressure development acting on the lining with the displacement of the tunnel sidewall to establish the full spectrum of the stratigraphic character. Therefore, it provides an optimal design method for controlling lining pressure or formation displacement. Finally, the validity and limitation of the commonly used lining design model are also pointed out.