[1]聂永江,邵光辉*.基于桩-土剪切特性的托底抗拔桩承载力分析[J].林业工程学报,2020,5(06):149-154.[doi:10.13360/j.issn.2096-1359.202006038]
 NIE Yongjiang,SHAO Guanghui*.Analysis of bearing capacity of the bottom uplift pile based on pile-soil shearing characteristics[J].Journal of Forestry Engineering,2020,5(06):149-154.[doi:10.13360/j.issn.2096-1359.202006038]
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基于桩-土剪切特性的托底抗拔桩承载力分析()
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《林业工程学报》[ISSN:2096-1359/CN:32-1862/S]

卷:
5
期数:
2020年06期
页码:
149-154
栏目:
森林工程与土建交通
出版日期:
2020-11-01

文章信息/Info

Title:
Analysis of bearing capacity of the bottom uplift pile based on pile-soil shearing characteristics
文章编号:
2096-1359(2020)06-0149-06
作者:
聂永江邵光辉*
南京林业大学土木工程学院,南京210037
Author(s):
NIE Yongjiang SHAO Guanghui*
College of Civil Engineering, Nanjing Forestry University, Nanjing 210037, China
关键词:
托底抗拔桩载荷传递函数承载力剪切特性
Keywords:
bottom uplift pile load transfer function bearing capacity shearing characteristic
分类号:
TU473.1
DOI:
10.13360/j.issn.2096-1359.202006038
文献标志码:
A
摘要:
托底抗拔桩作为一种新型的抗拔桩,其承载力理论尚待完善。桩土剪切特性对抗拔桩的极限承载力有重要的影响,基于桩土剪切特性确定托底抗拔桩的极限承载力能够更加准确地反映其工作实际。为研究砂土地基中托底抗拔桩的极限承载特性,在分析桩土体系剪切状态发展过程的基础上,建立了桩土多段线性荷载传递函数。推导了桩土在不同状态下桩身内力与位移的解析表达式,获得了托底抗拔桩荷载位移的解析解。通过工程算例,讨论了托底抗拔桩的极限承载力变化规律及其影响因素。结果表明:密砂地基中托底抗拔桩极限承载力计算应考虑桩周土的剪切软化特性。托底抗拔桩在达到极限破坏时,不同深度处桩土剪切应力不能同步达到极限强度,极限承载力低于传统理论计算值。软化系数是影响托底抗拔桩极限承载力的重要因素,软化系数越低,托底抗拔桩的极限承载力越低,与传统理论的计算值相差越大。
Abstract:
Bottom uplift pile is a new type pile, and its bearing capacity theory still needs to be improved. The shear behaviors of pilesoil interface have an important influence on the ultimate bearing capacity of pile pulling. The determination of ultimate bearing capacity based on pilesoil shear characteristics can more accurately reflect the actual work. In order to investigate the ultimate bearing capacity of bottom uplift pile in the sandy ground, the multistage linear load transfer function of pilesoil was established based on the development process to analyze the pilesoil shearing state. The analytical expressions of pile internal force and displacement under different conditions were derived. The analytical solution of the loaddisplacement of the pile was obtained. The ultimate bearing capacity and its influence factors of the bottom uplift pile were discussed based on an engineering case. The results indicatesd that the ultimate bearing capacity could be calculated according to the peak shear strength of the pilesoil system for bottom uplift pile in the loose sand ground. On the other hand, the shear softening characteristics of the soil around pile should be considered in the calculation process of the ultimate bearing capacity of the bottom uplift pile in the dense sand ground. When the ultimate failure reached, the shear stresses of pilesoil at different depths could not reach the ultimate strengths synchronously, and the ultimate bearing capacity of bottom uplift pile was lower than that calculated by the traditional theory. The ultimate bearing capacity of bottom uplift pile was obviously higher than that of the ordinary uplift pile, and the displacement of bottom uplift pile was much smaller than that of the ordinary uplift pile when the ultimate bearing capacity reached. The softening coefficient was an important factor to affect the ultimate bearing capacity of the pile in the dense sand ground. The lower the softening coefficient was, the lower the ultimate bearing capacity was, and the greater the difference was from the traditional theory.

备注/Memo

备注/Memo:
收稿日期:2020-06-14? ? 修回日期:2020-08-15
基金项目:江苏省住房和城乡建设厅科技项目(2012-ZD35)。
作者简介:聂永江,男,副教授,研究方向为教育管理和土木工程技术。通信作者:邵光辉,男,教授。E-mail:gh_shao@njfu.com.cn
更新日期/Last Update: 2020-11-11