Liquefaction-induced settlement of the pile group under vertical and horizontal ground motions
Liquefaction-induced settlement of the pile group under vertical and horizontal ground motions
复制标题
竖向和水平地震动作用下群桩液化沉降
DOI：
10.1016/j.soildyn.2021.106709
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发表时间：
2021-05
影响因子：
4
通讯作者：
Chen Guo-Xing
中科院分区：
文献类型：
--
作者：
Xu Ling-Yu;Song Cheng-Xiang;Chen Wei-Yun;Cai Fei;Li Yong-Yi;Chen Guo-Xing
端承桩已被广泛应用于砂土地区建筑物的抗震加固。然而，地震会在饱和砂土中产生过大的水压力，从而降低桩的摩阻和桩端承载力，进而导致桩的沉降不能被上部结构所承受。本文采用完全耦合的动力有效应力有限元方法，研究了饱和砂土中输入运动的频率分量、水平分量和竖向分量的幅值对饱和砂土地基中群桩沉降的影响。采用修正的广义塑性模型描述了不同密度砂土的动力特性。研究了土的渗透性对桩-土体系地震反应的影响。结果表明，在其他条件相同的情况下，相对较远的地震引起的砂层液化比附近的地震更严重，从而引起更多的群桩沉降。此外，竖向地震动会显著增加群桩的同震液化沉降量(ρE)，在工程设计中应予以考虑。针对承台在地面以上的群桩，提出了一种基于荷载传递法的简化实用方法来估算ρe。
End-bearing piles have been widely used to resist earthquake-induced settlement of buildings in sand deposits. However, the earthquake can generate the excess water pressure in saturated sand deposits and thus reduce both the friction resistance and end-bearing capacity of piles, further resulting in the pile settlement which may not be sustained by the superstructure. In this study, a fully coupled dynamic effective-stress finite element procedure is used to investigate the effects of the frequency content of input motion and the amplitude of both horizontal and vertical components of input motion on the settlement of the pile group in saturated sand deposits. A modified generalized plasticity model is employed to characterize the dynamic behavior of various density of sands. The effect of the soil permeability on the seismic response of the pile-soil system is investigated. The results indicate that the relatively distant earthquake cause more severe liquefaction at the sand deposit than the nearby earthquake and thus induces more settlement of the pile group under otherwise identical conditions. Moreover, the vertical ground motion could significantly increase the coseismic liquefaction-induced settlement of the pile group (ρE) and should be taken into account in engineering design. A simplified practical method based on the load-transfer methodology is proposed to estimate theρEfor the pile group with the cap above the ground.
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DOI：
10.1061/(asce)0733-9410(1983)109:9(1165
发表时间：
1983-09
期刊：
Journal of Geotechnical Engineering
影响因子：
--
作者：
De Alba;A. Pedro
通讯作者：
De Alba;A. Pedro
影响因子：
2.6
作者：
A. Elgamal;Jinchi Lu;Z. Yang
通讯作者：
A. Elgamal;Jinchi Lu;Z. Yang
使用修正的应变楔模型对粘土中单横向荷载桩进行非线性分析
影响因子：
1.7
作者：
Xu Ling-Yu;Chen Guo-Xing;Cai Fei;Wang Guo-Xin;Cai F
通讯作者：
Cai F
影响因子：
5.3
作者：
Ling-Yu Xu;F. Cai;Jingwen Pan;Ying-ying Xue
通讯作者：
Ling-Yu Xu;F. Cai;Jingwen Pan;Ying-ying Xue
DOI：
--
发表时间：
1999-05
期刊：
--
影响因子：
--
作者：
A. Chan;T. Shiomi
通讯作者：
A. Chan;T. Shiomi