摘要
通过室内动三轴试验,分析了路基填土及作为基底的复合地基在循环荷载作用下的应变软化性质,并以此为基础,采用动态弹塑性有限元分析了道路的变形性状。加固区置换率的变化会对路面变形产生影响,产生的影响主要通过其模量表现出来,但影响程度较小,所以,在满足稳定性要求以及下卧层顶面应力要求的情况下,不主张通过增大置换率来减小路面变形。对路面变形影响最大的是下卧层土体的性质,因此,软土层不是很厚时,最好加固整个土层,但软土层很厚时,加固效果比较差。加固区深度与宽度的变化会极大地影响路面变形,所以,软土层很厚时,可增大加固区深度与宽度以减小路面变形。
Through dynamic triaxial test,the property of strain degradation of embankment and composite foundation is studied. Base on this,dynamic elasto-plastic FEM is used to analyze the deformation properties of road. The changing replacement ratio in the stabilized range can have impact on the deformation,and the impact can be shown mainly by the modulus. However,the impact is relatively small. As a result,while meeting the requirements of the stability and the ceiling stress of the subsoil,it is not advocated to adopt the method of increasing replacement ratio of the composite foundation to lessen the deformation of the embankment. The greatest impact on the embankment depends on the property of the subsoil,therefore,the whole soil lay may well be strengthened in the case of thinner soft soil layer. The strengthening effect may be less satisfactory when the soft soil is very thick. The changes both in the depth and the width of the stabilized range can exert great influence on the deformation of embankment,in consequence of which the deformation of embankment can be lessened through increasing the depth and the width of the stabilized range if the soft soil layer is very thick.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2004年第5期826-830,共5页
Chinese Journal of Rock Mechanics and Engineering
基金
国家自然科学基金(50208001)资助项目。
关键词
土力学
路基
复合地基
循环荷载
应变软化
变形
soil mechanics,embankment,composite foundation,cyclic loading,strain degradation,deformation
