江汉平原砂土回弹模量干湿循环折减系数研究

Study on Dry-Wet Cycle Reduction Coefficient of Sandy Soil Resilience Modulus in Jianghan Plain

江汉平原是我国重要的粮食基地,也是武汉城市群发展的腹地。其地表组成物质以近代河流冲积物和湖泊淤积物为主,属细砂、粉砂及黏土,砂土占比超过一半。为掌握江汉平原典型江(河)砂土的路用工程特性,对江汉平原气候条件下砂料性能变化及回弹模量干湿循环折减系数取值的影响进行了室内试验研究,确定了在江汉平原典型干湿循环规律下砂土动态回弹模量变化规律,并为后续的计算分析、现场试验提供必要的岩土参数,为江汉平原高速公路砂土路基设计施工技术指南的定稿提供参照。

Jianghan plain is an important granary and the hinterland of Wuhan city group in China.The surface material is made up of modern river alluvial deposit and lake silt,which belong to fine sand,silt and clay,and the sandy soil accounts for the majority.In order to study the road engineering characteristics of typical sandy soil in Jianghan plain,experimental investigation on the influence of Jianghan plain climate on performance and dry-wet cycle reduction coefficient of resilience modulus are conducted.Dynamic resilience modulus variation law is verified by experiments,which could provide reference for follow-up study and technical guide for design and construction of sand subgrade of highways in Jianghan plain.