研究目的: 为研究考虑劣化效应时,列车荷载作用下隧道仰拱结构的振动响应问题,本文以贵南某高速铁路隧道为工程背景,建立带仰拱结构的高速铁路隧道动力响应模型,分析隧道衬砌经时劣化与围岩经时劣化对仰拱结构动力响应的影响。
研究结论: (1)衬砌经年劣化时,仰拱竖向变形几乎不变,服役后期测点加速度有一定程度的变化,测点最大主应力和最小主应力随劣化时间增加而减小,减小幅度较小;(2)围岩经年劣化时,仰拱竖向变形增幅明显,服役时间0~100 a仰拱中心测点竖向变形增幅为75%,加速度变化规律与衬砌劣化时相似,服役后期有一定的变化,仰拱动应力随围岩劣化呈两阶段变化,服役前期(0~75 a)动应力随劣化时间增加而增大,且增幅明显,服役后期(75~100 a)动应力随劣化时间增大而减小;(3)与衬砌劣化相比,围岩劣化对仰拱结构变形及受力影响更为显著,服役后期(75~100 a)仰拱结构受力发生改变,需加强隧道服役后期仰拱结构及周围岩体的检查及加固;(4)本研究结果可为服役期间隧道结构维护及风险评价提供一定的理论参考。
Abstract
Research purposes: In order to study the vibration response of tunnel inverted arch structure under train load when considering deterioration effect, a dynamic response model of high-speed railway tunnel with inverted arch structure is established based on the engineering background of a high-speed railway tunnel structure in Guinan. The influence of tunnel lining deterioration and surrounding rock deterioration on the dynamic response of inverted arch structure was analyzed.
Research conclusions: (1) During the annual deterioration of the lining, the vertical deformation of the inverted arch is almost unchanged, and the acceleration of the measuring point changes to a certain extent in the later stage of service. The maximum principal stress and the minimum principal stress decrease with the increase of deterioration time. (2) During the annual deterioration of surrounding rock, the vertical deformation of inverted arch increases obviously, and the vertical deformation of the central measuring point of inverted arch increases by 75% during 0~100 years of service. The change law of acceleration is similar to that of lining deterioration, and there is a certain change in the later stage of service. The dynamic stress of inverted arch changes in two stages with the deterioration of surrounding rock, and the dynamic stress increases obviously with the increase of deterioration time in the early stage of service. In the later stage of service (75~100 a), the dynamic stress decreases with the increase of deterioration time. (3) Compared with the deterioration of lining, the influence of surrounding rock deterioration on the deformation and stress of inverted arch structure is more significant. In the later period of service (75~100 a), the stress of inverted arch structure changes, so it is necessary to strengthen the inspection and reinforcement of inverted arch structure and surrounding rock mass in the later stage of tunnel service. (4) The research results can provide some theoretical reference for tunnel structure maintenance and risk assessment during service.
关键词
仰拱结构 /
衬砌劣化 /
围岩劣化 /
振动响应
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Key words
inverted arch structure /
lining deterioration /
surrounding rock deterioration /
vibration response
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中图分类号：
U25
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基金
河北省重点研发计划项目(19275410D);国家自然科学基金应急管理项目(71941014);河北省创新基金(CXZZSS2022104)
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