CAJ | 학술논문

为研究黄土隧道基底区域围岩压力的分布规律，采用数值方法建立三维有限元模型，用围岩应力等效围岩压力，分别考虑隧道不同施工方法、不同埋深的影响，从而得出隧道基底区域围岩压力在上述影响因素下的变化规律。分析可得台阶法基底围岩竖向应力值比其他施工方法小， CD法和CRD法在基底中线区域竖向应力值较大；在所研究的埋深范围内随隧道埋深的增加，其基底竖向应力值随之增大且埋深每增加10 m竖向应力增大系数在1.2~1.4等结论，为基底处理方案提供参考。
위연구황토수도기저구역위암압력적분포규률，채용수치방법건립삼유유한원모형，용위암응력등효위암압력，분별고필수도불동시공방법、불동매심적영향，종이득출수도기저구역위암압력재상술영향인소하적변화규률。분석가득태계법기저위암수향응력치비기타시공방법소， CD법화CRD법재기저중선구역수향응력치교대；재소연구적매심범위내수수도매심적증가，기기저수향응력치수지증대차매심매증가10 m수향응력증대계수재1.2~1.4등결론，위기저처리방안제공삼고。
To ascertain the distribution pattern of surrounding rock pressure in foundation base zone of loess tunnel, a three-dimensional finite element model was built with numerical method in this paper. Afterwards, the surrounding rock stress was regarded as the equivalent of surrounding rock pressure, and different tunnel construction methods and different buried depths were taken into account respectively. Therefore the distribution pattern of the surrounding rock pressure in the foundation base zone of the loess tunnel was able to be acquired. Finally, some conclusions were drawn as below: ( a ) the vertical surrounding rock stress obtained by bench cut method is smaller than other construction methods in the foundation base zone of the tunnel, while the vertical stresses obtained by CD method and CRD method are larger along the centerline of the foundation base;( b) within the range of buried depths studied, the vertical stress in the foundation base zone will increase with the increase of the buried depth of the tunnel, and every increase of 10m in buried depth is associated with a magnification coefficient of about 1.2 to 1.4. These useful conclusions can serve as reference for treatment scheme of foundation base.