路基土动态回弹模量的试验研究  

Laboratory Research on Dynamic Resilient Modulus of Subgrade Soil

作　　者：凌建明[1] 苏华才[1,2] 谢华昌[1,2] 官盛飞[1] 

机构地区：[1]同济大学道路与交通工程教育部重点试验室,上海201804 [2]广东省路桥建设发展有限公司,广州510635

出　　处：《地下空间与工程学报》2010年第5期919-925,共7页Chinese Journal of Underground Space and Engineering

基　　金：交通部西部交通建设科技资助项目(200431800004)

摘　　要：为明确路基土动态回弹模量的影响因素及其规律、解决其参数取值问题,采用三轴反复加载试验方法,对粉土和粘土进行一系列回弹模量测试。研究表明,回弹模量随围压和压实度的提高而增大,随循环偏应力和含水量的增大而减小;粘土回弹模量受应力状况、含水量等因素的影响较粉土更为显著。在全面分析现有回弹模量本构预估模型的基础上,采用三参数复合模型对试验结果进行拟合,获得不同压实度和含水量条件下粉土、粘土的回弹模量预估模型。通过与试验数据的对比,验证了该模型的正确性与可靠性。For the sake of investigating factors which affect subgrade dynamic resilient modulus and their laws,a series resilient modulus tests were carried out by conducting repeated load triaxial tests on reconstituted cylindrical specimens.The experimental results indicate that MR values rise with the increase of confining pressure and compaction degree,in reverse of circular deviator stress and moisture content.Compared to silty soil,the dynamic resilient modulus of clay is more sensitive to stress state and moisture content.Based on the comprehensive analysis of resilient modulus prediction models,a composite model which has 3 parameters and reflects the effect of confining pressure and deviator stress simultaneous was used to fit the experimental results.The prediction model used for different compaction degree and moisture content was achieved for both silty and clay soil.A consistency between the predictive results and the experimental data shows that the model developed is accurate and credible.

关 键 词：回弹模量 重复加载三轴试验 路基土 预估模型 

分 类 号：U416.03[交通运输工程—道路与铁道工程]