冻土融化体积压缩系数的经验确定方法  

Empirical method for determining thawing volume compression coefficient of frozen soil

作　　者：杨凤学[1] 张喜发[2] 冷毅飞[2] 赵意民[1] 

机构地区：[1]大庆油田工程有限公司,黑龙江大庆163712 [2]吉林大学建设工程学院,长春130026

出　　处：《岩土力学》2011年第11期3432-3436,共5页Rock and Soil Mechanics

基　　金：中国石油天然气集团公司技术开发项目"中俄原油管道漠河-大庆段工程冻土研究"资助

摘　　要：融沉变形破坏是多年冻土区建筑物冻害的主要原因之一,实际的融沉量是热融沉陷与压缩沉降量的叠加:冻土融化体积压缩系数是估算冻土融后压缩沉降变形量的关键计算参数。根据286个冻土原状样融沉压缩试验数据资料,对细砾土、砂土、粉土、黏性土、泥炭化黏性土和泥炭质土等6类土,分别提出了在0～100 kPa和0～200 kPa压力段两种条件下的体积压缩系数和干密度之间的线性、二项式和对数式回归分析方程式。在此基础上,给出了确定6类土体积压缩系数的经验数据表。此外,还指出了现有规范推荐方法和建议值所存在的问题。Thawing settlement deformation is one of the main freezing damage for the structure in permafrost region.The actual thawing settlement is the superposition of two parts： thaw settlement and compression settlement.The volume compression coefficient is the key calculation parameter in estimating the compression deformation.Basing on the 286 thawing compression test data of undisturbed frozen soil samples,it has put forward various types of regression equations including linear equation,binomial equation and logarithmic equation and these equations represent the relationship of volume compressibility and dry density of six sorts of soil on the two different pressure sections 0？100 kPa and 0？200 kPa.These soil types are fine gravel,sand,silt,clay,peaty clay and peat.On this basis the empirical volume compression data table of the six sorts of soils is given out;meanwhile,the problems in recommended methods of specifications are pointed out.

关 键 词：冻土融沉系数 体积压缩系数 干密度 

分 类 号：TU411[建筑科学—岩土工程]