1.西南交通大学土木工程学院,四川 成都 610031
2.西南交通大学高速铁路线路工程教育部重点实验室, 四川 成都 610031
3.中铁二院工程集团有限责任公司,四川 成都 610031
张瀚文(1998—),男,硕士研究生。主要从事路基支挡结构抗震研究。E-mail:1016171974@qq.com
蒋良潍(1974—),男,副教授,博士。主要从事支挡结构工程方面的研究。E-mail:jiangliangwei@home.swjtu.edu.cn
收稿:2022-11-15,
修回:2023-01-13,
纸质出版:2024-04-25
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张瀚文,蒋良潍,杜美玲等.重力式挡土墙抗震稳定性检算最不利状态选取探讨[J].防灾减灾工程学报,2024,44(02):372-380.
ZHANG Hanwen,JIANG Liangwei,DU Meiling,et al.Exploration on Selection of the Most Unfavorable State for Seismic Stability Calculation of Gravity Retaining Walls[J].Journal of Disaster Prevention and Mitigation Engineering,2024,44(02):372-380.
张瀚文,蒋良潍,杜美玲等.重力式挡土墙抗震稳定性检算最不利状态选取探讨[J].防灾减灾工程学报,2024,44(02):372-380. DOI: 10.13409/j.cnki.jdpme.20221115003.
ZHANG Hanwen,JIANG Liangwei,DU Meiling,et al.Exploration on Selection of the Most Unfavorable State for Seismic Stability Calculation of Gravity Retaining Walls[J].Journal of Disaster Prevention and Mitigation Engineering,2024,44(02):372-380. DOI: 10.13409/j.cnki.jdpme.20221115003.
重力式挡土墙整体稳定性检算最不利状态选取对抗震设计有重要影响。针对加速度峰值、墙身外倾峰值、墙顶位移峰值三种典型挡墙抗震危险时刻以及常用“土压力峰值时刻包络”取值方法,以振动台模型试验揭示地震土压力取值结果差异性,基于重力式挡土墙ABAQUS有限元模型地震响应计算,分析各危险时刻墙背土压力取值及整体稳定性检算结果差异,提出抗震稳定性检算最不利状态建议。结果表明:(1)随地面峰值加速度和墙高增加,三种危险时刻地震土压力均呈现从非线性分布向近似正三角图式转化,合力及作用点高度整体上较现行抗震规范分别大49%和18%;(2)峰值包络法因不能反映墙⁃土运动主/被动状态和地震动传导时延特征,致使墙顶附近土压力取值结果过大,地震土压力合力较危险时刻大一倍且作用点偏高约25%;(3)墙身外倾峰值危险时刻的抗滑移稳定系数较其余两种危险时刻偏小14%~33%,且随地面峰值加速度增大反映出更明显的衰减敏感性,以此作为抗震稳定性检算最不利状态有利于结构安全与经济性协调。
The selection of the most unfavorable state in the overall stability calculation of gravity retaining walls has an important influence on seismic design. Shaking table model tests were used to reveal the differences in seismic earth pressure values at three critical seismic moments for retaining walls
namely
peak acceleration
peak outward rotation of the wall
and peak displacement at the top of the wall. Also
an evaluation of the envelope method
commonly used to select values at the peak earth pressure moment
was conducted. Based on the seismic response calculations of gravity retaining walls by the ABAQUS finite element model
the differences in earth pressure values at the back of the wall and the overall stability calculation results at each critical moment were analyzed
and the most unfavorable state in seismic stability calculation was proposed. Research showed that: (1) With the increase of peak ground acceleration and wall height
the seismic earth pressure at the three critical moments all showed a transition from a non-linear distribution to an approximately equilateral triangular pattern. The combined earth pressure and the height of its action point were
on average
49% and 18% greater
respectively
than those in the current seismic design codes.(2) Due to the inability of peak envelope method to reflect the active/passive state of wall-soil motion and the seismic wave propagation delay
the earth pressure values near the top of the wall were overly high
and the combined seismic earth pressure was twice as large as that at the critical moments
with the action point about 25% higher. (3) The anti-slide stability coefficient at the moment of peak wall outward rotation was 14%~33% smaller than the other two
and the sensitivity to attenuation was more obvious with the increase of peak ground acceleration. Therefore
selecting the critical moment of peak wall outward rotation as the most unfavorable state in seismic stability calculation is deemed to achieve a balance between structural safety and cost-effectiveness.
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