摘要
设计开展了不同温度和初始干密度工况下冻土桩基的水平承载特性试验,试验结果表明:相同温度下,桩基的桩顶位移随干密度的增大而逐渐减小,但是当温度为-0.5℃时,桩顶位移随干密度的增大而增大,相同干密度情况下,温度越高,桩顶位移越大,且破坏方式由脆性向塑性转变;荷载和温度越高,干密度越小时,桩身最大弯矩值越大,对桩身产生的弯矩影响范围也越大;采用等时荷载—位移曲线法得到了不同工况下桩基的临界水平承载力,并经拟合分析得到了冻土桩基在不同工况下的水平临界承载力经验公式,相关研究结果可为冻土地区桩基工程设计和施工提供借鉴。
The tests for the horizontal bearing characteristics of frozen soil pile foundation under different temperature and initial dry density conditions are designed and carried out.The test results show that the displacement of pile top decreases with the increase of dry density under the same temperature,but when the temperature is-0.5℃,the displacement of pile top increases with the increase of dry density.Under the same dry density,the higher the temperature,the greater the displacement of pile top,and the failure mode changes from brittleness to plasticity;the higher the load and the temperature,and the smaller the dry density,the greater the maximum bending moment value of the pile body,and the greater the influence range of the bending moment on the pile body;the critical horizontal bearing capacity of the pile foundation under different working conditions is obtained by using the isochronous load displacement curve method,and the empirical formula of the horizontal critical bearing capacity of the frozen soil pile foundation under different working conditions is obtained by the fitting analysis.The results could be used for the reference in the design and construction of pile foundation in permafrost area.
出处
《工程勘察》
2021年第5期18-24,共7页
Geotechnical Investigation & Surveying
关键词
冻土桩基
桩顶位移
弯矩
等时荷载—位移曲线
临界水平承载力
经验公式
frozen soil pile foundation
pile top displacement
bending moment
isochronous load displacement curve
critical horizontal bearing capacity
empirical formula
分类号
TU45
[建筑科学—岩土工程]
