季冻区桥梁基桩抗冻拔验算几个问题的探讨  

Approach to Some Problems of the Check of Anti-Frost Heaving of Bridge Pile Foundation in Seasonally Frozen Regions

作　　者：盛洪飞[1] 

机构地区：[1]哈尔滨建筑工程学院

出　　处：《冰川冻土》1989年第1期44-52,共9页Journal of Glaciology and Geocryology

摘　　要：本文在调查研究及实际工程验证的基础上,对桥梁基桩抗冻拔验算提出了新的建议。其中包括:给出符合桥梁工程应用要求的单位面积切向冻胀力值表,提出在总切向冻胀力计算中必须考虑标准冻深修正系数n_Т,分析冻结过程在冻结界面作用冻胀反力而形成的暖土部分桩土作用机制及摩阻力计算性质,冻结线以下桩身自重按一半考虑等问题。Based on investigations and practical project experiments, some new ideas on the check of anti-frost heaving of bridge foundation piles are proposed and their principal contents have been admitted into the new revised edition of the Design Code of the Base and Foundation of Highway Bridge and Culvert. The values of the tangential frost heaving force on bridge structure presented in this paper are based on the hydrogeologic characteristics of the bridge structure and determined according to the envelope of the actual values measured recently in our country. The frost depth is variable, so that the standard frost depth should be taken in design. When calculating tangential frost heaving force, it is suggested that a revised coefficient nTof the standard frost depth should be used. According to the stress state of a pile under the action of frost heave, it is pointed out that the value of friction between the pile and warm earth determined on the basis of a general axial tensile pile is wrong . It should be determined on basis of a general axial compressed pile. On the basis of actual test conditions under which the value of friction between pile and soil is determined, only half of the pile weight below freezing front should be considered.

关 键 词：冻土区 桥梁 基桩 抗冻拔 外包络线 

分 类 号：U442.51[建筑科学—桥梁与隧道工程]