摘要
通过对某一级公路路基填土的天然含水量、液限、塑限、颗粒组成、矿物成分、自由膨胀率、胀缩总率等试验研究,运用塑性图,并综合各项指标对路基填土的膨胀性做了评价。结果认为,此路基填土为高液限和塑限的淤泥质软土,天然状态下具有弱膨胀性。通过对路基填土的击实试验和承载比试验表明,填土压实之后具有一定的膨胀性,在含水量变化差异性影响下的胀缩变形可能导致路基开裂。
Based on the experimental study on water contents, liquid limit, plastic limit, particle composition, mineral content, free expansive ratio and swell-shrink total ratio of the filled soil in a first-class highway, this paper evaluates the property of the subgrade soil by using the plasticity chart and considering various indices. It is concluded that the filled soil is silt soil with high liquid limit and plastic limit, which has the low swelling property in natural state. According to the results of the compaction test and bearing ration test, it is discovered that the filled soil also has the swelling property after being compressed, which may result in the crack of the subgrade with the change of the water contents.
出处
《地球科学与环境学报》
CAS
2007年第1期85-89,共5页
Journal of Earth Sciences and Environment
基金
江苏省苏州高速公路指挥部项目(NJU2005-1-23)
关键词
淤泥质软土
填土
膨胀性评价
路基
silt soil
filled soil
swelling property evaluation
subgrade
