季冻区路基土回弹模量与CBR之间关系的研究  

Research on the Relationship Between Resilience Modulus and CBR in Seasonal Frozen Region

作　　者：程培峰[1] 姚志英[1] 

机构地区：[1]东北林业大学土木工程学院,哈尔滨150040

出　　处：《森林工程》2015年第3期121-123,158,共4页Forest Engineering

摘　　要：为研究季冻区公路路基土回弹模量与CBR(California bearig ratio)之间的关系,选取粘质土和粉质土两种具有代表性的季冻区路基土,以含水率和压实度为控制参数,应用杠杆压力仪和CBR试验仪进行室内回弹模量试验和CBR试验,分析两指标与含水率、压实度之间的关系。得到:季冻区路基土回弹模量与CBR随压实度的增大而增大,随含水率的增大呈现先上升后下降的趋势,在含水率大约等于最佳含水率加2%时回弹模量和CBR取得最大值;最后将试验结果进行线性拟合,得出季冻区低液限黏土和低液限粉土的回弹模量和CBR之间的特定关系式。本研究成果对于季冻区的路基设计与施工具有一定的指导作用,研究成果由季冻区路基土的试验数据统计得出,其关系式仅适用于季冻区的黏土及粉土。In order to analyze the relationship between resilience modulus and CBR in seasonal frozen region, the two representa- tive subgrade soil, clay soil and silty soil, in seasonal frozen region were selected to carry out the laboratory resilient modulus test and CBR test. The relationship between the two indices and moisture content and degree of compaction was analyzed. The results indicated that the resilience modulus and CBR increased with the increase of degree of compaction and showed the trend of increasing first and then decreasing as the moisture content increased. When the moisture content was approximately 2%, the resilience modulus and CBR were the largest. After the results were fitted, the specific relationships between the resilience modulus and CBR for low liquid limit clay and low liquid limit silt were proposed, which has a certain guidance for the design of subgrade and construction in the seasonal frozen region.

关 键 词：季冻区 路基土 回弹模量 CBR 含水率 压实度 

分 类 号：S773[农业科学—森林工程] U416.1[农业科学—林学]