摘要
为了研究不同冻结方式下高山草甸区贡觉~芒康公路路基季冻土的冻胀变形特性,基于室内冻胀试验,分析了路基土在单向冻结和周围冻结条件下的冻胀变形特性。试验结果表明:两种冻结方式下,土中含水率、细颗粒含量与冻胀变形率均为正相关关系;在含水率、细颗粒含量相同的情况下,土在单向冻结情况下的冻胀率小于周围冻结的冻胀率;实际工程中设计路基土级配时,初始含水率宜控制在最佳含水率即8%左右,土中细颗粒含量宜控制在9%左右;在单向冻结情况下,土中初始含水率和细颗粒含量均对土的冻胀变形率有明显影响,初始含水率的影响更明显;在周围冻结情况下,初始含水率对土的冻胀变形率有明显影响,细颗粒含量对土冻胀变形率无明显影响。
In order to study the frost heave deformation characteristics of subgrade soil of GongjueMangkang highway in alpine meadow area under different freezing modes,the frost heave deformation characteristics of subgrade soil under unidirectional freezing and surrounding freezing are analyzed based on indoor frost heave test.The test results show that there is a positive correlation between soil moisture content,fine particle content and frost heave deformation rate;under the same moisture content and fine particle content,the frost heave rate of soil under surrounding freezing is greater than that of unidirectional freezing;when designing subgrade soil gradation in practical engineering,the initial moisture content should be controlled at the optimum moisture content of about 8%,and the content of fine particles in soil should be controlled at about 9%;under unidirectional freezing,the initial moisture content and fine particle content in the soil significantly affect the frost heave deformation rate of the soil,and the initial moisture content has a more significant effect;and under surrounding freezing,the initial moisture content significantly affects the frost heave deformation rate of soil,but the content of fine particles has no significant effect on the frost heave deformation rate of soil.
作者
魏进
任劲涛
石发进
肖随明
WEI Jin;REN Jin-tao;SHI Fa-jin;XIAO Sui-ming(School of Highway,Chang’an University,Xi’an 710064,China;ZHONGJIAOTONGLI Construction Co.Ltd.,Xi’an 710064,China;Danjiangkou Highway Administration Bureau,Danjiangkou 442700,China)
出处
《公路》
北大核心
2020年第7期44-49,共6页
Highway
基金
中央高校基本科研业务费专项基金项目
项目编号310821173701。
关键词
路基
季冻土
草甸区
冻胀试验
冻结方式
冻胀变形率
subgrade
seasonal frozen soil
meadow area
frost heave test
freezing mode
frost heave deformation rate
