CAJ | 학술논문

为了探讨盾构隧道结构在纵向地震动力作用下盾构管片的振动特性。通过将土-结构相互作用简化为等效刚度弹簧建立了模型，并推导了结构在地震作用下的运动方程。然后利用中心差分法求解所得到的运动方程，求得每段管片在不同时刻的位移。进一步研究了土-结构剪切系数、地震纵波速度和结构连接刚度3个因素对隧道盾构管片位移的影响。计算结果表明，随着土-结构之间剪切系数增大，管片最大位移随之增加，结构之间的相对位移减小。而降低结构之间的连接刚度后，土-结构之间的相对位移减小。波的传播速度越小，结构与地层之间相对位移越大，易导致滑移现象出现。因此，选取具有较快波速的坚硬地层、提高土与结构之间的剪切力以及设置合理的抗震缝距离将有助于增加结构的抗震性能。
위료탐토순구수도결구재종향지진동력작용하순구관편적진동특성。통과장토-결구상호작용간화위등효강도탄황건립료모형，병추도료결구재지진작용하적운동방정。연후이용중심차분법구해소득도적운동방정，구득매단관편재불동시각적위이。진일보연구료토-결구전절계수、지진종파속도화결구련접강도3개인소대수도순구관편위이적영향。계산결과표명，수착토-결구지간전절계수증대，관편최대위이수지증가，결구지간적상대위이감소。이강저결구지간적련접강도후，토-결구지간적상대위이감소。파적전파속도월소，결구여지층지간상대위이월대，역도치활이현상출현。인차，선취구유교쾌파속적견경지층、제고토여결구지간적전절력이급설치합리적항진봉거리장유조우증가결구적항진성능。
The dynamic characteristics of the shield tunnel structure under the longitudinal seismic action was inves-tigated. At first, the soil-structure interaction was modeled by springs with equivalent stiffness, and the motion e-quations of structure under seismic action were derived. Central difference method was used to solve the obtained motion equations,and the displacement of every section at different moment of time obtained. Furthermore, the effects of three parameters, including soil-structure shear coefficient, seismic P-wave velocity and structural con-nection stiffness, on shield tunnel segment displacement were investigated. The numerical results show that as the soil-structure shear coefficient increases, the maximum displacement of tunnel segment increases, and that the rela-tive displacement between the structures reduces. After reducing the stiffness of the structure, the relative displace-ment between the structures and the soil reduces. The lower the wave propagation speed, the larger the relative dis-placement between the structure and formation becomes, which leads to the slip phenomenon. So choosing rigid foundation with larger wave propagation velocity, increasing interacting shear stress between soil and structure, and setting a reasonable seismic joint distance will help to improve the anti-earthquake performance of underground structures.