摘要
结合湿陷性黄土地区大直径扩底桩现场浸水载荷试验,利用PLAXIS有限元软件,在考虑湿陷性黄土湿陷变形的基础上,从桩端持力层厚度及变形模量的变化对单桩竖向承载力的影响进行了数值模拟分析,对其影响程度进行了定量计算。研究结果表明:湿陷性黄土地区,持力层临界厚度为3D(D为扩底端直径),桩端持力层变形模量的提高可以显著增加单桩竖向极限承载力,单桩极限承载力的提高主要通过桩端阻力的提高来实现,而且桩侧摩阻力对单桩极限承载力的分担也不可忽视。
Combined with the in-situ immersion load test of the large diameter belled pile in collapsible loess region, using PLAXIS finite element software, considering the deformation of collapsible loess, the quantitative analysis on the impact from the change of the pile founding layer thickness and deformation modulus to the vertical bearing capacity of single pile is simulated. The results show that founding layer critical thickness is 3D （D is the enlarged bottom diameter） in the collapsible loess areas. Improving the subsoil deformation modulus of pile end could significantly increase the single pile vertical ultimate bearing capacity. The ultimate bearing capacity of single pile could be improved mainly by pile bottom resistance enhancement, and the pile side friction cannot be ignored.
作者
李高山
程顺利
欧阳涛坚
潘永坚
Li Gaoshan Cheng Shunli Ouyang Taojian Pan Yongjian(Zhejiang Engineering Invesgation Institute, Ningbo 315012, China)
出处
《工程勘察》
2017年第11期18-24,共7页
Geotechnical Investigation & Surveying
关键词
扩底桩
湿陷性黄土
持力层厚度
临界厚度
变形模量
belled pile
collapsible loess
bearing layer thickness
critical thickness
deformation modulus
