CAJ | 학술논문

以南昌地铁1号线八一广场段为工程背景，对轨道-隧道-大地的三维有限元模型进行动力学分析。分别建立三种道床模型：整体道床、弹性支承块道床和钢弹簧浮置板道床。以振动加速度、1/3倍频程振动加速度级和Z振级作为评价指标，比较不同轨道结构下隧道壁及地面的振动响应。随之减振道床支承刚度的变化，分析道床的自振频率对减振效果的影响。计算表明：列车引起的地面振动主频在40 Hz附近；减振道床的自振频率对减振效果有较大影响；钢弹簧浮置板道床减振效果明显优于弹性支承块道床。
이남창지철1호선팔일엄장단위공정배경，대궤도-수도-대지적삼유유한원모형진행동역학분석。분별건립삼충도상모형：정체도상、탄성지승괴도상화강탄황부치판도상。이진동가속도、1/3배빈정진동가속도급화Z진급작위평개지표，비교불동궤도결구하수도벽급지면적진동향응。수지감진도상지승강도적변화，분석도상적자진빈솔대감진효과적영향。계산표명：열차인기적지면진동주빈재40 Hz부근；감진도상적자진빈솔대감진효과유교대영향；강탄황부치판도상감진효과명현우우탄성지승괴도상。
Taking the part of subway line 1 in Nanchang Bayi square area as the engineering object, the three-dimensional finite element model of a rail-tunnel-ground system is constructed and its dynamic responses are calculated. Three kinds of track bed models, monolithic track bed, elastically supported block track bed and steel-spring floating-slab track bed, are constructed. Taking vibration acceleration, one-third octave vibration acceleration level and Z vibration level as evaluation indexes, the vibration responses of the tunnel wall and ground surface with different track structures are compared. Considering the support stiffness change of the vibration-reduction track bed, the influence of natural frequency on the vibration reduction effect is analyzed. The study shows that the main frequency of ground surface vibration induced by train is near 40Hz. The natural frequency of vibration for the vibration-reduction track bed has a great influence on the vibration reduction effect. The vibration reduction effect of the steel-spring floating-slab track bed is much better than that of the elastically supported block track bed.