大兴安岭路基冻结粉质黏土融沉特性  

Thawing and Settlement Characteristics of Frozen Silty Clay in the Greater Khingan Mountains Forest Region Subgrade

作　　者：郭润麒 刘利骄 王淼 孙剑飞[1] 柳艳杰[1] GUO Runqi;LIU Lijiao;WANG Miao;SUN Jianfei;LIU Yanjie(School of Civil Engineering,Heilongjiang University,Harbin 150080,China;Heilongjiang Province Hydraulic Research Institute,Harbin 150080,China)

机构地区：[1]黑龙江大学建筑工程学院,哈尔滨150080 [2]黑龙江省水利科学研究院,哈尔滨150080

出　　处：《森林工程》2023年第6期172-176,共5页Forest Engineering

基　　金：国家自然科学资金项目(41071049);冻土工程国家重点实验室开放基金项目(SKLFSE201802;SKLFSE201919)。

摘　　要：大兴安岭林区公路沿线广泛分布冻结粉质黏土,全球气候变暖导致冻结粉质黏土发生融化沉降。为探究影响大兴安岭路基冻结粉质黏土融化沉降的因素,分析含水率、干密度以及超塑含水率对路基冻结粉质黏土融沉系数的影响,提出“融沉敏感点”的概念,且得到在“融沉敏感点”前后含水率对融沉系数的影响并不相同;在研究干密度对融沉系数的影响中发现,随着干密度越大其融沉系数以较大的斜率递减;通过分析超塑含水率对融沉系数的影响发现,超塑含水率与融沉系数呈线性增长关系,并通过数据拟合分别给出融沉系数与含水率、干密度及超塑含水率之间的函数关系。Frozen silty clay is widely distributed along the roads in the Greater Khingan Mountains forest region,and global warming has led to melting and settlement of frozen silty clay.In order to explore the factors affecting the thawing-settlement of frozen silty clay in the Greater Khingan Mountains subgrade,the influence of water content,dry density and superplastic water content on the thawing-settlement coefficients of frozen silty clay in the subgrade was analyzed.The concept of‘sensitivity limit of thawing-settlement’was proposed,and it was found that the influence of water content on the thawing-settlement coefficient was different before and after the‘sensitivity limit of thawing-settlement’.In the study of the effect of dry density on the thawing-settlement coefficient,it was found that the thawing-settlement coefficient decreased with a larger slope as the dry density increased;by analyzing the effect of superplastic water content on the thawing-settlement coefficient,it was found that the superplastic water content and the thawing-settlement coefficient had a linear growth relationship,and by fitting the data,the functional relationships between the thawing-settlement coefficient and the water content,dry density and superplastic water content were given separately.

关 键 词：大兴安岭林区 路基 冻土 粉质黏土 融沉 含水率 

分 类 号：S773.3[农业科学—森林工程] TB16[农业科学—林学]