冻土区桥梁群桩基础地基回冻过程的非线性分析  

Nonlinear Analysis of ground refreezing processfor pile group bridge foundation in permafrost

作　　者：吴亚平[1] 苏强[1] 郭春香[1] 朱元林[2] 张鲁新[2] 赵世运[2] 

机构地区：[1]兰州交通大学,甘肃兰州730070 [2]中国科学院寒区旱区环境与工程研究所冻土工程国家重点实验室,甘肃兰州730000

出　　处：《土木工程学报》2006年第2期78-84,共7页China Civil Engineering Journal

基　　金：国家自然科学基金(50378043);教育部春晖计划;兰州交通大学"青蓝"人才工程基金;冻土工程国家重点实验室开放基金

摘　　要：考虑大气温度、水文地质条件、混凝土入模温度、冻土初始地温场的影响及相变效应,以传热学为基础,给出了冻土区桥梁群桩基础地温场控制微分方程、边界和初始条件,及其空间分析有限元计算模式。结合青藏铁路冻土区某桥梁工程实例对群桩回冻过程温度场进行了计算,将计算值与实测数据进行了对比,提出了回冻率的概念,并对回冻过程及前景进行了分析。Based on the theory of heat conduction, this paper presents governing differential equations, boundary conditions, and initial conditions of ground temperature field, and the nonlinear finite element model for concrete pile group bridge foundation in permafrost. Air temperature, hydrology-geology conditions, concrete casting temperature, inital ground temperature field and phase-change effect were taken into consideration. The temperature field of ground re-freezing process was calculated for a concrete pile group bridge foundation built in the permafrost on the Qinghai-Tibet plateau. The calculation was compared with the field ground re-freezing process was analyzed. Significant measurement, a concept of re-freezing rate was developed and the conclusions were drawn.

关 键 词：多年冻土区 钻孔灌注群桩 地温场 回冻率 非线性有限元分析 

分 类 号：TU445[建筑科学—岩土工程]