铁道科学与工程学报2025，Vol.22Issue(1)：161-171,11.DOI:10.19713/j.cnki.43-1423/u.T20240504
基于Newmark法的土钉支护边坡震后位移三维上限分析
Three-dimensional upper-bound analysis of seismic-induced displacements of soil nailed slopes
摘要
Abstract
Based on the upper bound limit analysis,combined with the three-dimensional rotational failure mechanism of slopes and the Newmark method,the three-dimensional stability and seismic-induced permanent displacement of soil nailed slopes were investigated by using the horizontal seismic acceleration time curve to characterize the seismic effect.Compared with the results of shaking table tests,it was found that the critical slip surfaces and displacements predicted by this method match with the test results,which verified the reliability of the proposed method.A dimensionless coefficient Mt was proposed to characterize the strength and three-dimensional distribution of soil nails in slopes.The effects of slope aspect ratio,c/γH,slope inclination and soil friction angle on the critical yield acceleration were investigated under three sets of Mt.Design charts for displacement coefficient with slope inclination,soil internal friction angle,and Mt as variable were calculated.The seismic displacement integrals tables were obtained by quadratic integration of two horizontal seismic acceleration time history curves.The results show that as the dimensionless coefficient Mt increases,the critical yield acceleration of soil nailed slopes also increases,while the seismic-induced displacement of slopes decreases,and the corresponding critical yield acceleration growth rate decreases as the length and strength of soil nails are increased.With the increase of slope inclination,the displacement coefficient increases and then decreases,and the larger Mt is,the larger the slope inclination is when the coefficient takes the peak.Based on the slope parameters,the seismic permanent displacement of the slopes can be directly estimated by combining the graphs of the critical yield acceleration,the dimensionless displacement coefficient,and the two integral tables of two typical earthquake acceleration time history.The results of the study can provide a reference for the seismic-induced displacement prediction of soil nailed slopes and the values of soil nail parameters.关键词
土钉支护边坡/地震稳定/Newmark位移/三维稳定性/极限分析上限法Key words
soil nailed slopes/seismic stability/Newmark displacements/three-dimensional stability/upper bound limit analysis分类
建筑与水利引用本文复制引用
余家骥,黄旭东,陈志宇,王玲,阮波,潘秋景..基于Newmark法的土钉支护边坡震后位移三维上限分析[J].铁道科学与工程学报,2025,22(1):161-171,11.基金项目
国家自然科学基金资助项目(52108388) （52108388）
湖南省自然科学基金资助项目(2022JJ40611) （2022JJ40611）
湖南铁院土木工程检测有限公司开放基金资助项目(HNTY2022K02) （HNTY2022K02）
