首页|隧道式锚碇的承载机理及夹持效应指标分析

隧道式锚碇的承载机理及夹持效应指标分析

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  • 国家科技期刊平台
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  • NSTL
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为了衡量隧道锚夹持效应发挥作用的大小，本文通过分析隧道锚的承载特性，提出用隧道锚的夹持效应系数和峰值承载力作为夹持效应指标，并利用Mohr-Coulomb准则对二者的表达式进行了推导;对普立特大桥隧道锚进行了有限元分析，通过对其应力、塑性区等指标的分析来计算其夹持效应指标来对其适用性和准确性进行验证;对不同位移状态下的夹持效应系数进行分析，并结合位移、荷载、承载力和夹持效应系数对隧道锚的设计提出建议。研究结果表明:公式计算结果、有限元分析结果及现有研究结果间的误差小于10％，所得公式具有良好的适用性和准确性;在荷载不变的情况下，隧道锚的夹持效应系数随着承载力的减小而呈增大趋势，说明适当降低隧道锚的承载力有助于夹持效应发挥作用，隧道锚也更满足其保护环境、资源节约的特点。研究结果可为隧道锚的设计提供依据。
Analysis of the bearing mechanism and clamping effect index of tunnel-type anchorages
To measure the influence of the clamping effect of tunnel-type anchorage(TTA)by analyzing the bearing characteristics of TTA,the clamping effect coefficient and peak bearing capacity were proposed as the clamping effect index,and their expressions were derived by using the Mohr-Coulomb theory.A finite element analysis of the TTA of the Puli Bridge was conducted,and its applicability and accuracy were verified by calculating the clamping effect index by analyzing its stress,plastic zone,and other indicators.The clamping effect coefficients under differ-ent displacement states were analyzed,and suggestions for the design of TTA were made in terms of displacement,load,bearing capacity,and clamping effect coefficients.Results showed that the error between the formula calcula-tion,finite element analysis,and existing research is＜10％and the obtained formula has good applicability and ac-curacy.Under a constant-load condition,the clamping effect coefficient of TTA increases with decreasing bearing capacity,indicating that the appropriate reduction of the bearing capacity of TTA helps the clamping effect to play a role,and TTA also satisfies its advantages of protecting the environment and saving resources.The research re-sults can provide a basis for the TTA design.

bridge and tunnel engineeringtunnel-type anchorageclamping effectfinite element analysisbearing capacityMohr-Coulomb theory

杨国俊、田骐玮、伏一多、吕明航、唐光武、杜永峰、韩宗建

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兰州理工大学土木工程学院,甘肃兰州 730050

招商局重庆交通科研设计院有限公司桥梁工程结构动力学国家重点实验室,重庆 400067

西南交通大学土木工程学院,四川成都 610031

桥梁与隧道工程 隧道式锚碇 夹持效应 有限元分析 承载能力 Mohr-Coulomb准则

国家自然科学基金国家自然科学基金甘肃省科技计划

518082745216804222JR5RA250

2024

10.11990/jheu.202208037

哈尔滨工程大学学报
哈尔滨工程大学

哈尔滨工程大学学报

CSTPCD北大核心
影响因子：0.655
ISSN：1006-7043
年,卷(期)：2024.45(5)
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