多次冻融循环条件下格栅加筋黏土土体上部含水率变化规律试验研究  

Experimental Reasearch on the Change Law about Upper Soil's Moisture Content of Geogrid-reinforced Clay under Many Times Freezing-thawing Cycles

作　　者：赵荣飞[1] 宓永宁[1] 张玉清[1] 姜广田 高微[3] 张颖[1] 

机构地区：[1]沈阳农业大学水利学院,沈阳110866 [2]辽宁省水利厅,沈阳110003 [3]沈阳农业大学工程学院,沈阳110866

出　　处：《中国农村水利水电》2012年第7期128-131,共4页China Rural Water and Hydropower

基　　金：2011年度沈阳农业大学青年教师科研基金资助项目

摘　　要：路基土体冻融后表层含水率的增加,使其承载能力急剧下降,路面破坏严重。以沈阳市北二环加筋土工程为背景,根据加筋黏土选用的不同的填料压实度K、加筋间距δ和初始含水率ω0,安排二次正交旋转组合设计试验,得出多次冻融循环条件下不同加筋黏土试件上部含水率变化值Δω。通过分析试验数据和数学计算,得出试件上部含水率变化值Δω关于填料压实度、加筋间距和初始含水率的回归方程,并对方程和各影响因素进行显著性检验。利用所得方程计算其他试验条件下的Δω值,结果表明计算值和试验值较为吻合,即所得方程可用于格栅加筋土体多次冻融循环后土体上部含水率变化值Δω的初步计算。同时,根据回归方程分析各因素对Δω的影响规律,为工程实践提供理论参考。The surface moisture content of subgrade soil will increase after the freeze-thaw,it’s carrying capacity fell sharply,and the pavement destroyed seriously.Based on the North Second ring road’s reinforced soil project in Shenyang.By using quadric orthogonal rotating combination design experiment,the moisture content change value is obtained in the upper of specimens.Under many given times freezing-thawing cycles for the geogrid-reinforced clay with different degrees of compaction,moisture content and reinforcement spacing.Through analysis of the test data and mathematical calculation to get the regression equation about the related fillers compaction degree,reinforcement spacing and initial moisture content,and the conspicuousness about the equation and is tested.The results show that the calculated values and experimental data fit well,the equation can be used for initial calculation Δω under many times freezing-thawing cycles,Also,according to the regression equation of the various factors on the analysis of the influence law,theoretical reference is provided for the engineering practice.At the same time,the influence law of various factors could be found according to the regression equation analysis,and provide a theoretical reference for the engineering practice.

关 键 词：冻融循环 格栅加筋黏土 上部含水率 压实度 加筋间距 初始含水率 

分 类 号：TU41[建筑科学—岩土工程]