摘要
为符合实际研究膨胀土的增湿体积变形性质,精心设计了测试方案,完成了16组有荷条件下南宁外环膨胀土分级增湿变形试验,获得了土样含水率变化与体积变形间的相互关系。试验结果表明:上覆压力和试样初始含水率越大,其膨胀率随含水率变化的增量曲线越平缓,最终的膨胀率以及含水率增量越小。基于实测增湿变形参数,推导了南宁膨胀土膨胀变形、上覆压力、初始含水率及含水率增量间的关系式,计算了封闭包盖路堤填芯膨胀土湿度变化所引起的路基变形,提出了物理处治膨胀土路堤施工的建议。
In order to accord with the practical situation of studied volumetric deformation of expansive soil wetting,the conventional oedometer is improved and the test program is well-designed,16 group tests of Nanning expansive soil wetting in deformation tests under loading conditions are completed to get the relationship between the change of water content and volume deformation of the soil samples.The results show that when the loading pressure and initial water content are larger,the sample＇s expansion ratio changes with the water content of incremental curve will be more slow,the final expansive ratio and increment of water content will be much smaller.Finally,based on the measured humidification deformation parameters,relation of Nanning expansive soil among swelling deformation,loading pressure,initial water content and the increment of water content are promoted,and the expansion of the closed and cover road embankment are calculated,the change of the core filling soil water content can cause the deformation of subgrade,thus some construction suggestions are put foward using the physical treatment technology for building expansive road embankment.
出处
《交通科学与工程》
2015年第1期21-26,32,共7页
Journal of Transport Science and Engineering
关键词
膨胀土
含水率
分级增湿
变形特性
胀限含水率
expansive soil
water content
wetting in stages
deformation characteristic
the expansion limiting water content
