【摘要】 基于有限元分析软件ABAQUS平台,编制材料本构模型子程序UMAT,采用粘弹性人工边界条件模拟能量开放系统的边界,利用二次开发后的ABAQUS软件,模拟了隧道与围岩系统的三维地震反应,对比分析了不同入射角度下隧道结构与围岩土体的地震反应规律。分析结果表明,在地震荷载作用下,土体产生了不可恢复的塑性变形,主要表现为地表沉降;在斜入射条件下,随着入射角的增大,地表沉降显著增大,且沉降最终趋于稳定的时间有延长的趋势;均质地层中的大跨度长距离隧道结构,其横向地震反应受入射角的影响较大,表现为随着入射角的增大,结构的竖向沉降以及Mises应力显著增大;其纵向地震反应受入射角的影响不大。更多还原

【Abstract】 Material constitutive model subroutine UMAT was programmed based on the platform of finite element analysis software ABAQUS.The viscoelastic artificial boundary was applied to simulate the boundary of the energy open system.The software ABAQUS developed secondly was used to simulate the three-dimensional seismic response of tunnel structures and surrounding system.Then the law of seismic response of tunnel structure and surrounding soil mass under different seismic incident angles was analyzed comparatively.Results show that the soil mass produces irrecoverable plastic deformation under the seismic load,which is mainly manifested as surface subsidence.The surface subsidence grows significantly and the subsidence eventually stabilizing time has a tendency to lengthen with the increase of incidence angle in conditions of oblique incidence.And the transverse seismic response of structure is greatly influenced by the incident angle for long span tunnel structures in homogeneous stratum.The larger the incidence angle,the greater the vertical subsidence and Mises stress of structure.Then the longitudinal seismic response is not much affected by the incident angle.更多还原