基于耦合欧拉-拉格朗日方法的砂土中静压桩挤土效应数值模拟

doi:10.6040/j.issn.1672-3961.0.2023.050

摘要/Abstract

摘要： 为探讨砂土地基中静压桩沉桩过程的挤土效应,引入Simsand砂土临界状态本构模型,采用耦合欧拉-拉格朗日(coupled Eulerian-Lagrangian, CEL)方法,模拟分析了砂土中静压沉桩过程的挤土效应。基于相关试验数据校定本构模型参数,利用模拟离心机沉桩试验,验证数值模型的准确性。结果表明,挤土效应的影响区域直径随着桩尖角度和砂土相对密度的增大而增大,压入过程中,平底桩的挤土效应倾向于竖向向前,增大了土体阻力。桩基压入引起近地表土层发生隆起,密砂地层的隆起较松砂地层显著。随着深度增加,桩周土体的竖向位移由隆起变为向下移动,且趋于稳定,密砂中发生的侧向位移大于松砂地层。挤土效应的影响区域直径随桩端竖向向下方向迅速衰减,随桩端竖向向上方向发生小幅度减小,在密砂中沿径向方向呈现先增大后减小的趋势。

关键词: 静压桩, 数值模拟, 耦合欧拉-拉格朗日方法, 挤土效应, 砂土

中图分类号:

TU473

韩超,王彤,陈德文,孙恩赐,李平,吴则祥,周冲,庄培芝. 基于耦合欧拉-拉格朗日方法的砂土中静压桩挤土效应数值模拟[J]. 山东大学学报 (工学版), 2024, 54(2): 143-152.

HAN Chao, WANG Tong, CHEN Dewen, SUN Enci, LI Ping, WU Zexiang, ZHOU Chong, ZHUANG Peizhi. Numerical simulation of compaction effect during pile jacking in sand based on the coupled Eulerian-Lagrangian method[J]. Journal of Shandong University(Engineering Science), 2024, 54(2): 143-152.

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