深厚软土中大直径超长桩承载机理数值模拟研究  

Numerical simulation study on the bearing mechanism of large diameter and extra long piles in deep soft soil

作　　者：梁华燕 叶洪兵 王智 徐琰 Liang Huayan;Ye Hongbing;Wang Zhi;Xu Yan(Sichuan Branch,MCC Construction Engineering Group Co.,Ltd.,Chengdu Sichuan 610052,China;Chongqing University,Chongqing 400044,China)

机构地区：[1]中冶建工集团有限公司四川分公司,四川成都610052 [2]重庆大学,重庆400044

出　　处：《山西建筑》2024年第11期55-59,共5页Shanxi Architecture

基　　金：国家自然科学基金:强震作用下韧性桩锚结构抗震性能与计算方法(编号:52178312)。

摘　　要：大直径超长桩的承载力问题在工程中逐渐涌现,尤其在深厚软土地区,具有很强的现实工程意义,依托福州地铁园项目现场试验结果,基于PLAXIS 3D进行数值模拟研究,并通过数值模拟结果分析深厚软土中大直径超长桩承载机理,结果表明,超长混凝土桩轴力呈非线性分布,自上至下逐渐减小,同一埋深处,桩身轴力随着荷载等级增加而逐渐增大;摩阻力的发挥程度与荷载大小、土层性质有关;桩长、桩径对承载机理也有较大影响。The bearing capacity of large-diameter and ultra-long piles has emerged in engineering,especially in deep soft soil areas,with strong practical engineering significance.Based on the results of field tests in the Fuzhou Metro Park project,a numerical simulation study is carried out based on PLAXIS 3D and analysed to understand the mechanism of the bearing capacity of large-diameter ultra-long piles in deep soft soil.The results indicate that the axial force of the ultra-long concrete piles is non-linear and decreases gradually from top to bottom.At the same buried depth,the axial force of the pile body increases gradually with the increase of load level.The degree of frictional resistance is related to the load and soil properties;The length and diameter of the pile also have a significant impact on the bearing mechanism.

关 键 词：深厚软土 大直径超长桩 数值模拟 

分 类 号：TU473.11[建筑科学—结构工程]