静压桩沉桩挤土效应细观数值模拟研究  

Microscopic numerical simulation study on soil squeezing effect of static pressure pile

作　　者：于艳 陈亚东[2] 李其融 刘旭 盛维高[3] YU Yan;CHEN Yadong;LI Qirong;LIU Xu;SHENG Weigao(Jiangsu Huaiyin Water Conservancy Construction Co.,Ltd.,Huai’an,Jiangsu 223300,China;Faculty of Architecture and Civil Engineering,Huaiyin Institute of Technology,Huai’an,Jiangsu 223001,China;Jiangsu Huaishuxinhe Management Office,Huai’an,Jiangsu 223000,China)

机构地区：[1]江苏淮阴水利建设有限公司,江苏淮安223300 [2]淮阴工学院建筑工程学院,江苏淮安223001 [3]江苏省淮沭新河管理处,江苏淮安223000

出　　处：《江苏建筑职业技术学院学报》2024年第4期28-32,共5页Journal Of Jiangsu Vocational Institute of Architectural Technology

基　　金：国家自然科学基金资助项目(51408254);江苏省六大人才高峰资助项目(JZ-051).

摘　　要：采用基于离散元理论的颗粒流数值仿真方法,利用考虑滚动阻抗的线性接触模型,建立考虑施工过程的静压桩数值分析模型,研究土体密实程度、多桩先后贯入以及贯入速度等因素对沉桩挤土效应的影响。研究结果表明:静压单桩贯入时地表位移影响范围最大(约为13D),桩身中部位移影响范围最小,土体密实度越高,静压单桩贯入阻力越大;相邻桩贯入后桩端位移影响范围由8D增加到11D,桩间和施工侧产生明显隆起变形;压桩过程中,桩端阻力先快速增长,然后开始降速并呈线性增加,后施工桩端阻力为先施工桩的1.6倍;随着压桩速度的增加,端阻力快速增加,但挤土效应降低。Using a particle flow numerical simulation method based on discrete element theory and a linear contact model considering rolling impedance,a static pressure pile numerical analysis model considering the construction process is established to study the influence of factors such as soil porosity,multiple pile penetration and penetration speed on the soil squeezing effect of pile driving.The research results indicate that the range of surface displacement influence is the largest(about 13D)when static pressure single pile is penetrated,and the range of displacement influence in the middle of the pile body is the smallest.The higher the compactness of the soil,the greater the penetration resistance of a single static pressure pile.After the adjacent piles penetrate,the range of influence of pile end displacement increases from 8D to 11D,and significant uplift deformation occurs between piles and on the construction side.During the process of pile driving,the resistance at the pile end first increases rapidly,then begins to decrease and increase linearly.The resistance at the pile end during later construction is 1.6 times that of the first construction pile;With the increase of pile driving speed,the end resistance increases rapidly,but the soil squeezing effect decreases.

关 键 词：静压桩 离散单元法 挤土效应 位移影响范围 桩端阻力 

分 类 号：TU473[建筑科学—结构工程]