防灾减灾工程学报2017，Vol.37Issue(4)：525-531,7.DOI:10.13409/j.cnki.jdpme.2017.04.003
循环温度作用下砂土地基能量桩的长期工作特性
Long-term Performance of Energy Piles Subjected to Cyclic Thermal Loading in Sand
摘要
Abstract
In order to improve the design of the energy pile,the long-term performance of a freehead energy pile in dry sand was analyzed by using a sequentially coupled thermal-stress analysis approach.In the analysis,the bounding surface model was used to describe the mechanical behavior of sands under cyclic loadings.The effects of the seasonally cyclic thermal loading on the pile displacement,the shaft friction,and the factor of safety were studied in detail.It was found the temperature cycles leaded to the accumulation of the settlement at the pile head,and the accumulated settlement increased with the static working load level and the temperature cycle number.The location of the null point controlled the relative displacement pattern between the pile and the soil,which affected the distribution and the development of the shaft friction.Due to the volumetric contraction of sands,the negative friction was induced at the upper part of the pile,and the shaft friction at the lower part of the pile was reduced significantly.It was the main reason for the decrease in the pile bearing capacity.关键词
能量桩/砂土/热-力耦合/循环效应/长期工作特性Key words
energy pile/sand/thermo-mechanical coupling/cyclic effect/long-term performance分类
建筑与水利引用本文复制引用
费康,洪伟,钱建,刘汉龙..循环温度作用下砂土地基能量桩的长期工作特性[J].防灾减灾工程学报,2017,37(4):525-531,7.基金项目
国家自然科学基金项目(51378178)、江苏省“青蓝工程”项目(苏教师[2016]15号)、扬州大学科技创新培育基金项目(2016CXJ033)资助 （51378178）
