螺旋桩芯劲性复合桩群桩效应数值模拟分析  

Numerical Analysis on Group Pile Effect of Pressure Grouted Helical Pile Group

作　　者：范毅敏 宗钟凌 黄蕴晗 庄潇轩 Fan Yimin;Zong Zhongling;Huang Yunhan;Zhuang Xiaoxuan(College of Civil and Harbor Engineering,Jiangsu Ocean University,Lianyungang 222002,Jiangsu,China)

机构地区：[1]江苏海洋大学土木与港海工程学院,江苏连云港222002

出　　处：《岩土工程技术》2024年第5期548-553,共6页Geotechnical Engineering Technique

基　　金：江苏省重点研发计划(社会发展)项目(BE2021681)。

摘　　要：螺旋桩芯劲性复合桩(Helix Stiffened Cement Mixing Pile,简称HSCMP)是一种新型复合桩,其群桩效应及承载力变化规律尚不明确。基于有限元数值模拟方法,对HSCMP桩间距与叶片直径比(Sg/DH)和水泥土强度与桩周土强度比(Cref/Su)进行参数化分析,并将分析结果与群桩效应系数理论计算结果对比。结果表明:保持叶片直径和土的基本性能不变的情况下,群桩承载力与水泥土强度及桩间距正相关;Sg/DH≤2时,理论计算结果与数值模拟结果相似,随着Sg/DH增加,数值模拟结果与应力叠加法结果较为吻合;Sg/DH≤2时,桩间土应力叠加效应显著,易导致螺旋桩芯–水泥土柱的界面破坏,但Cref/Su≥40时,破坏模式不再发生改变,表现为水泥土柱–土的界面破坏。Helix Stiffened Cement Mixing Pile(HSCMP)is a new type of composite pile,and its group pile effect and bearing capacity variation law is still unclear.Based on the finite element numerical simulation method,the ratio of HSCMP pile spacing to helix diameter(Sg/DH)and the ratio of cement soil strength to soil strength around the pile(Cref/Su)were parametrically analyzed and the results were compared with the theoretical calculation of the group pile effect coefficient.The results show that the group pile bearing capacity is positively correlated with soil strength and pile spacing when the helix diameter and soil properties are kept constant;when Sg/DH≤2,the existing theoretical calculation results are similar to the numerical simulation results,and the numerical simulation results are more consistent with the stress superposition method as Sg/DH increases;when Sg/DH≤2,the stress superposition effect of soil between piles is significant,which is easy to lead to the damage of the interface of helical pile core-cement soil column,but when Cref/Su≥40,the damage mode will not be changed again,and it is shown as the damage of the interface of cement soil column-soil.

关 键 词：HSCMP群桩 群桩效应 破坏模式 数值模拟 

分 类 号：TU473[建筑科学—结构工程]