Based on Zhongtiaoshan tunnel,the paper undertakes the finite element simulation on the differences in the step length and the length of the remained core rock in the excavation by adopting the remained core rock step method in the road tunnels,analyzes the influence of the step length and the length of the core rock on the longitudinal displacement of the tunnel face and the longitudinal depth of plastic zones,maximum and minimum principal stresses of tunnel face,and concludes the reasonable step length and the designed the length of the core rock.%依托中条山公路隧道,对公路隧道在黄土段采用预留核心土台阶法开挖时,对台阶长度、预留核心土长度的不同进行了有限元模拟,分析了台阶长度和核心土长度对隧道掌子面的纵向位移、塑性区的纵向深度的影响以及掌子面最大最小主应力,得出了合理的台阶长度及留设核心土的长度。
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