摘要
为明确根键桩抗拔受力模型以及桩土作用规律,对等截面桩、扩底桩以及根键桩竖向荷载及联合荷载下的抗拔性能进行测试,并结合有限元模拟对不同根键密度下承载力变化规律以及结构强度进行探究。结果表明:(1)根键桩更适用于复杂荷载工况以及对位移有严格要求的建筑基础,且根键桩多层变截面使材料承载力发挥更充分,也更经济;(2)试验条件下,桩周土体裂隙率与荷载的关系符合指数分布,同荷载下裂隙率越高则承载能力越低,极限荷载下裂隙率越高则对土体承载能力发挥越充分;(3)提高根键密度有利于降低根键周围土压力,防止基础过早发生塑性破坏,一般而言,根键与相同直径圆环截面积比值α应为0.1~0.3。
In order to clarify the load transfer model for root piles and the action law of pile-soil,the uplift bearing capacities of equal section pile,belled pile and root pile are tested.Meantime,the change rules of the bearing capacity under different densities of root are explored through numerical stimulation.The result shows that:(1)The root pile is more suitable under the conditions of complex load and strict requirements for displacement.Moreover,the multi-layer variable cross-section setting of the root pile makes the bearing capacity of material,play a further role and achieves the goal of economic saving.(2)In the test condition,the relationship between the crack rate of soil around piles and the load is exponential distribution.Under the same load,the higher the fissure rate,the lower the bearing capacity.Under the ultimate load,the higher the fissure rate,the more fully the bearing capacity of soil will be exerted.(3)Increasing the density of roots(cross-section area)is beneficial to reducing the earth pressure around the roots and preventing the plastic failure from happening in the original period of the foundation.In generally,the ratio of the roots to the branch cross-section area with the same diameter should be set from 0.1 to 0.3.
作者
张吉禄
黄雪峰
周俊鹏
韦林辉
袁俊
王学明
ZHANG Ji-lu;HUANG Xue-feng;ZHOU Jun-peng;WEI Lin-hui;YUAN Jun;WANG Xue-ming(School of Civil Engineering,Lanzhou University of Technology,Lanzhou 730050,China;School of Civil Engineering,Chongqing Jiaotong University,Chongqing 400074,China;Department of Military Installations Engineering,Army Logistical University of PLA,Chongqing 401311,China;Northwest Electric Power Design Institute Co.,Ltd.of China Power Engineering Consulting Group,Xi'an 710075,China)
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
2021年第S01期47-52,共6页
Chinese Journal of Geotechnical Engineering
基金
重庆市研究生创新基金项目(CYB18126)
关键词
根键桩
抗拔承载特性
现场试验
数值模拟
root pile
uplift bearing characteristic
field test
numerical simulation
作者简介
张吉禄(1993—),男,硕士,主要从事非饱和土理论、黄土等特殊土的工程性质及地基处理等方面的设计与研究工作。E-mail:540726390@qq.com;通信作者:黄雪峰,E-mail:hxfen60@163.com
