粉土中刚性桩贯入模拟  

Penetration Simulation for Rigid Pile of Silt

作　　者：贺咏梅[1,2] 居俊[3] 杜广印[4] He Yongmei Ju Jun Du Guangyin(Colloge of Environmemt and Civil Engineering, Chengdu University of Technology State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology Department of Construction Management, Changshu Institute of Technology Transportation College, Southeast University)

机构地区：[1]成都理工大学环境与土木工程学院,成都市610059 [2]成都理工大学地质灾害防治与地质环境保护国家重点实验室,成都市610059 [3]常熟理工学院工程管理系,江苏常熟215500 [4]东南大学交通学院,南京市210096

出　　处：《勘察科学技术》2017年第2期5-8,共4页Site Investigation Science and Technology

基　　金：国家自然科学基金(413722308;51608059)

摘　　要：该文采用非线性大变形有限元方法,考虑相应的边界条件,建立了粉土中刚性桩贯入机理分析模型,研究了此类软土中刚性桩贯入的作用规律。结果表明,刚性桩贯入粉土时,桩端处径向应力最大,沿水平向逐渐减小,应力泡范围为6倍桩径,桩端以下径向应力迅速递减;当桩端到达该深度之前,竖向是加载的;而当桩继续向下贯入时,竖向是卸载的;贯入阻力沿深度持续增大,地表隆起位移最大值发生在桩侧处且沿径向迅速递减,水平向影响距离为4D。In this paper, the analysis model of penetration mechanism of rigid pile in silt is established by using the nonlinear large deformation finite element method with the consideration of corresponding boundary conditions. The penetration rules of rigid pile into this kind of soft soil are studied. The results show that when the rigid pile penetrates into the silt, the largest radial stress occurs at the pile tip and re- duces along the horizontal direction. The range of stress bubble is 6 times of the pile diameter. The radial stress discreases quickly under the pile tip; Before the pile tip reaches the depth, the vertical is loading; When the pile penetration continues downward, the vertical is unloading; The penetration resistance in- creases along the depth. The maximum displacement of the surface uplift occurs at the side of the pile and decreases rapidly along the radial direction. The horizontal effect distance is 4D.

关 键 词：粉土 非线性大变形 刚性桩 贯入模拟 

分 类 号：TU473.1[建筑科学—结构工程]