移动荷载作用下地铁隧道结构和围岩真三维动力分析

发布时间：2018-03-22 14:26

本文选题：地铁　切入点：移动荷载　出处：《铁道学报》2017年06期 　论文类型：期刊论文

【摘要】：构建精细化双线地铁轨道-隧道结构-围岩非线性耦合系统动力分析模型,以三维黏弹性静-动力统一人工边界模拟地基无限域,考虑材料非线性、接触非线性和隧道运营前的静应力状态,研究移动荷载作用下地铁隧道和围岩的动力行为。结果表明:荷载移动过程中,隧道衬砌周向不同位置均经历了多次加、卸载过程;衬砌的动应力水平较低但速率效应明显;受载钢轨附近位置的动应力响应规律性较强,较远位置的动应力响应无明显规律;受载钢轨正下方靠近衬砌处的土单元以受压为主,其动应力水平较低但速率效应较大;同一断面衬砌在不同时刻和同一时刻不同位置处断面受力状态不同,其轴力合力与合弯矩的变化不完全一致。
[Abstract]:The dynamic analysis model of nonlinear coupling system between track tunnel structure and surrounding rock of two-line subway is constructed. The three-dimensional viscoelastic static and dynamic unified artificial boundary is used to simulate the infinite domain of foundation considering material nonlinearity. The dynamic behavior of subway tunnel and surrounding rock under moving load is studied under contact nonlinearity and static stress state before tunnel operation. The results show that the tunnel lining in different circumferential position has undergone many loading and unloading processes in the course of load movement. The dynamic stress level of the lining is lower but the rate effect is obvious, the dynamic stress response near the loaded rail is more regular, but the dynamic stress response in the far position is not obvious, and the soil element near the lining directly below the loaded rail is mainly under compression. The dynamic stress level is lower but the rate effect is larger, and the axial force force and the bending moment of the same section lining are different at different time and at the same time.
【作者单位】：重庆交通大学土木工程学院;清华大学土木水利学院;
【分类号】：U231;U451

【相似文献】