摘要
为了探讨静压桩贯入层状砂土地基引起的桩周土体分层效应,基于耦合欧拉-拉格朗日法,结合考虑颗粒破碎的砂土临界状态本构模型SIMSAND-Br模型,建立层状砂土地基中静压桩贯入过程挤土效应数值模型;基于已有的三轴排水剪切试验数据校正SIMSAND-Br模型参数,并用于模拟已有的离心机桩基贯入模型试验,通过对比模拟结果与已有的离心机桩基贯入模型试验数据,验证所建立模型的可靠性;采用验证后的所建立模型模拟分析层状砂土地基中静压桩贯入阻力和土体位移。结果表明:模拟计算的静压桩贯入阻力和土体位移结果与已有的离心机桩基贯入模型试验结果一致,所建立的模型可以用于层状砂土地基中静压桩贯入过程挤土效应的模拟分析;土体分层对于靠近土体分层界面一定范围内的静压桩贯入阻力和所引起的竖向位移具有较大影响,影响区域直径约为桩直径的4~10倍,对水平位移的影响极小,该影响区域大小随着砂土相对密实度和与分层界面距离的变化而显著变化。
To investigate the delamination effect of soil around piles caused by penetration of jacked piles into layered sand foundations,a numerical model of soil compaction effect during penetration process of jacked piles in layered sandy foundations was established based on coupled Eulerian-Lagrangian method and a critical state constitutive model of sand considering particle breakage named SIMSAND-Br model.On the basis of existing triaxial drainage shear test data,parameters of SIMSAND-Br model were corrected and used to simulate existing centrifuge pile foundation penetration model test.Reliability of the established model was verified by comparing simulation results with existing centrifuge pile foundation penetration model test data.The verified established model was used to simulate and analyze penetration resistance and soil displacement of jacked piles in layered sandy foundations.The results show that the simulation results of penetration resistance and soil displacement of jacked piles are consistent with the results of the existing centrifuge pile foundation penetration model test.The established model can be used to simulate and analyze the soil compaction effect of jacked pile penetration process in layered sandy foundations.Soil delamination has a great influence on the penetration resistance and the vertical displacement of jacked piles in a certain range near the soil delamination interface.The diameter of the affected area is about 4 to 10 times of the pile diameter,and the influence on the horizontal displacement is very small.The size of the affected area changes significantly with the relative density of sand and the distance from the delamination interface.
作者
王彤
高北
蔡汉竹
吴则祥
莫品强
扈萍
庄培芝
WANG Tong;GAO Bei;CAI Hanzhu;WU Zexiang;MO Pinqiang;HU Ping;ZHUANG Peizhi(School of Civil Engineering and Architecture,University of Jinan,Jinan 250022,Shandong,China;Shandong Luqiao Group Co.,Ltd.,Jinan 250014,Shandong,China;College of Civil Engineering and Architecture,Wenzhou University,Wenzhou 325035,Zhejiang,China;School of Mechanics and Civil Engineering,China University of Mining and Technology,Xuzhou 221116,Jiangsu,China;School of Qilu Transportation,Shandong University,Jinan 250002,Shandong,China)
出处
《济南大学学报（自然科学版）》
CAS
北大核心
2024年第5期609-618,633,共11页
Journal of University of Jinan(Science and Technology)
基金
山东省自然科学基金项目(ZR2021QE186)
交通运输部交通运输行业重点科技项目(2022-ZD4-047)。
关键词
桩基
挤土效应
耦合欧拉-拉格朗日法
层状砂土地基
数值模拟
pile foundation
soil compaction effect
coupled Eulerian-Lagrangian method
layered sandy foundation
numerical simulation
