相变效应对灌注桩与冻土回冻过程影响的研究  

STUDY ON PHASE TRANSFORMATION EFFECT DUE TO REFROZEN PROCESS OF CAST-IN-PLACE PILES AND FROZEN SOIL

作　　者：贾艳敏[1] 徐达[1] 郭红雨[2] 

机构地区：[1]东北林业大学土木工程学院,黑龙江哈尔滨150040 [2]江苏省交通科学研究院,江苏南京210017

出　　处：《工程力学》2010年第A01期145-149,共5页Engineering Mechanics

基　　金：2009黑龙江省公路建设行动计划科研项目(2009-019)

摘　　要：以传热学为基础,考虑地质条件、冻土初始地温场的影响及相变效应,在自然回冻状态下,给出冻土地区桩基温度场的二维控制微分方程及初始边界条件。结合试桩工程实例,建立二维数值模型,数值方法求解的计算值与实测值吻合较好。分析了钻孔灌注桩与冻土回冻过程,得出了灌注桩浇筑混凝土后桩体温度分布不均匀,呈非线性变化;确定了灌注桩的热扰动核心区域。Based on the heat transfer theory,in the state of nature refrozen,the plane differential equation and initial boundary conditions of the temperature field of a pile foundation in a frozen soil region are presented considering hydrology-geology conditions and the initial ground temperature field and phase transformation effect.Taking the test pile engineering as an example,the numerical model of plane is established.The numerical results are in good agreement with the test results.The process of the refrozen both of the pile and frozen soil were analyzed.The conclusion is as follows：the distribution of temperature of the pile is asymmetry after casting,the change of temperature is nonlinear,and the core region of heat disturbance is ascertained.

关 键 词：桩基础 冻土 数值模拟 相变效应 水化热 回冻 

分 类 号：TU473.1[建筑科学—结构工程]