摘要
通过室内重复加载三轴试验研究3种级配碎石的回弹特性,分析体应力、偏应力、含水量、级配类型对回弹模量的影响。试验结果表明,级配碎石回弹模量随含水量的减小、围压应力的增大而显著增大;随偏应力的增大而缓慢增大或先略有减小再缓慢增大(低应力状况下);级配类型对回弹模量也有一定影响。应用非线性回归方法得到NCHRP 1-28A本构模型参数,将拟合得到的模型参数与物性试验结果相联系,建立基于物性指标的模型参数预估公式。
Dynamic resilient modulus of three graded crush stones were stuided by repeated loading triaxial test,and the effects of bulk stress,deviation stress,moisture content and gradation type on the resilient modulus were analyzed.Results indicate that the resilient modulus of graded crush stone remarkably increases with moisture content decrease and/or confining stress increase;the resilient modulus of graded crush stone slowly increases,or minor decreases at the beginning and then slowly increases with deviation stress increase at low stress level.Results also suggest that the gradation type has a certain impact on resilient modulus.Furthermore,NCHRP 1-28A constitutive model parameters were obtained using a non-linear regression method,and predictive equations of model parameters were established based on physical indexes to connect fitted model parameters with physical test results.
出处
《地下空间与工程学报》
CSCD
北大核心
2010年第4期735-741,746,共8页
Chinese Journal of Underground Space and Engineering
基金
交通部西部交通建设科技项目(200431800004)
关键词
级配碎石
回弹模量
重复加载三轴试验
模型
graded crush stone
resilient modulus
repeated loading triaxial test
model
作者简介
王随原（1977-），男，河南汝南人，博士研究生，助理研究员，主要从事沥青路面结构与材料的研究。E-mail：wang_suiyuan@126．com
