摘要
为了研究温度荷载影响下静钻根植桩的承载特性,通过室内试验测得温度在混凝土-土界面上的传导特性及对界面接触摩阻力的影响.测试结果表明,接触压力对温度传导无明显影响,温度对混凝土-土接触面上摩阻力无明显影响.根据试验测试结果,采用顺序热力耦合分析方法,建立考虑温度荷载影响的静钻根植桩受力分析有限元模型.计算结果表明,制热及降温过程对静钻根植桩承载特性的影响受桩顶荷载的影响较大.温度荷载引起的预制桩桩身轴力、桩侧摩阻力及桩顶、桩端位移、水泥土竖向应力的变化均与桩顶荷载相关,制热与降温过程引起的静钻根植桩承载特性变化有较大差异.
Laboratory tests were conducted to obtain the conduction characteristics of the temperature on the concrete-soil interface and the effect on the contact resistance of the interface in order to analyze the bearing characteristics of static drill rooted pile under the influence of temperature. The tested results show that the contact pressure has no obvious effect on the temperature conduction and the temperature has no obvious effect on the frictional resistance of the concrete-soil interface. A finite element model considering the influence of temperature was established by adopting sequential thermal mechanical coupling method to analyze the bearing characteristics of the static drill pile. The calculation results showed that the influence of the heating and cooling process on the bearing characteristics of the static drill rooted pile was greatly influenced by the pile top load. The variations of the axial force and side friction resistance of precast pile, and the displacement at pile top and pile end, and the vertical stress of cement soil are all related to the pile top load. The bearing characteristics of the static drill rooted pile caused by the heating and cooling have great differences.
作者
王忠瑾
张日红
王奎华
方鹏飞
谢新宇
徐韩强
李金柱
WANG Zhong-jin;ZHANG Ri-hong;WANG Kui-hua;FANG Peng-fei;XIE Xin-yu;XU Han-qiang;LI Jin-zhu(College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, China;Ningbo Institute of Technology, Zhejiang University, Ningbo 315100, China;ZCONE High-tech Pile Industry Holdings Co. Ltd., Ningbo 315000, China)
出处
《浙江大学学报（工学版）》
EI
CAS
CSCD
北大核心
2019年第1期11-18,50,共9页
Journal of Zhejiang University：Engineering Science
基金
国家自然科学基金资助项目(51708496
51708497)
浙江省自然科学基金资助项目(LY16E080010
LQ18E080001)
宁波市自然科学基金资助项目(2016A610216)
关键词
静钻根植桩
能源桩
荷载-温度耦合
承载力
沉降
static drill rooted pile
energy pile
coupling of load and temperature
bearing capacity
settlements
