[1]王瑄,肖世国.考虑加固桩轴力的层状土坡地震稳定性分析方法[J].高速铁路技术,2022,13(04):59-67.[doi:10.12098/j.issn.1674-8247.2022.04.010]
　WANG Xuan,XIAO Shiguo.Seismic Stability Analysis Method of Stratified Soil Slope Considering Axial Force on Reinforcing Piles[J].HIGH SPEED RAILWAY TECHNOLOGY,2022,13(04):59-67.[doi:10.12098/j.issn.1674-8247.2022.04.010]
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考虑加固桩轴力的层状土坡地震稳定性分析方法()
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《高速铁路技术》[ISSN:1674-8247/CN:51-1730/U]

卷:
13卷
期数:
2022年04期
页码:
59-67
栏目:
出版日期:
2022-08-28

文章信息/Info

Title:
Seismic Stability Analysis Method of Stratified Soil Slope Considering Axial Force on Reinforcing Piles
文章编号:
1674—8247(2022)04—0059-09
作者:
王瑄;  肖世国
1. 西南交通大学, 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, 成都 610031
Author(s):
WANG Xuan;  XIAO Shiguo
1. Southwest Jiaotong University, Chengdu 610031, China;
2. Key Laboratory of High-speed Railway Engineering, Ministry of Education, Southwest Jiaotong University, Chengdu 610031, China
关键词:
层状土坡|加固桩|地震稳定性|极限分析|桩体轴力
Keywords:
stratified soil slope|reinforcing pile|seismic stability|limit analysis|axial force on pile body
分类号:
TU443
DOI:
10.12098/j.issn.1674-8247.2022.04.010
文献标志码:
A
摘要:
在地震作用下,土质边坡的加固桩内力较静力条件下有一定增大,其轴力作用不可忽视。针对加固桩加固多层土质边坡的地震稳定性问题,充分考虑桩体轴力作用,基于对数螺旋面滑动模式,采用极限分析上限法和拟静力法,推导了桩体剪力计算表达式,确定了在给定设计安全系数下桩体需提供的剪力及坡体的临界滑动面位置。实例分析表明,静力条件下本法与忽略桩体轴力的既有方法得到的桩体剪力值较为一致,相对偏差约为4%;但在地震条件下,本法比既有方法结果偏大,且二者差异与地震影响系数呈正相关性。讨论了地震影响系数、设桩位置、桩径、层面倾角、各土层厚度等因素对桩体剪力的影响;其中,水平地震影响系数、层面倾角及设桩位置影响较大,桩体剪力与前两者呈成显著正相关性,与后者呈非单调关系;多层土坡中较软弱土层的相对厚度对桩体剪力影响显著,剪力值随较软弱土层相对层厚增大而增加,但当设桩位置靠近坡顶或者层面倾角较大时,其影响减弱。
Abstract:
Under the seismic action, the internal force of reinforcing piles for soil slopes increases to a certain extent compared with that under static conditions, and its axial force action cannot be ignored. Aiming at the problem of seismic stability of multi-layer soil slope reinforced by reinforcing piles, the axial force of the pile body is fully considered. Based on the logarithmic spiral sliding mode, the upper limit method of limit analysis and pseudo-static method are employed to derive the calculation expression of pile shear force, and the shear force to be provided by the pile body and the critical sliding surface position of the slope body are determined under a given design safety factor. The case analysis shows that the shear force values of this method and the existing method neglecting the axial force on the pile body under static conditions are relatively consistent, with a relative deviation of about 4%. However, under seismic conditions, the results of this method are larger than those of the existing method, and the difference between them is positively correlated with the seismic influence coefficient. The impact of seismic influence coefficient, pile location, pile diameter, the dip angle of the bedding plane, and thickness of each soil layer on the shear force of the pile body is discussed. Among them, the horizontal seismic influence coefficient, the dip angle of the bedding plane, and the pile location have a great impact, and the shear force of the pile body is significantly positively correlated with the former two and is non-monotonic with the latter two. The relative thickness of the softer soil layer in the multi-layer soil slope has a significant impact on the shear force of the pile body. The shear force value increases with the increase of the relative thickness of the softer soil layer, but when the pile location is close to the slope top or the dip angle of the bedding plane is large, its impact weakens.

备注/Memo

备注/Memo:
作者简介：王瑄(1996-),女,硕士研究生。基金项目：四川省交通运输科技项目(2020-A-01);国家自然基金资助项目(51578466)引文格式：王瑄,肖世国.考虑加固桩轴力的层状土坡地震稳定性分析方法[J].高速铁路技术,2022,13(4):59-67.WANG Xuan, XIAO Shiguo.Seismic Stability Analysis Method of Stratified Soil Slope Considering Axial Force on Reinforcing Piles[J]. High Speed Railway Technology, 2022, 13(4):59-67.
更新日期/Last Update: 2022-08-28