土工格栅加筋垫层工作特性分析  

The Working Characteristic Analysis of Geogrid Reinforced Cushion

作　　者：王亚涛[1] 何杰[1] 汤磊华 王忍[1] 高建喜[1] 

机构地区：[1]湖南工业大学土木工程学院,湖南株洲412007

出　　处：《湖南工业大学学报》2015年第4期15-19,共5页Journal of Hunan University of Technology

基　　金：国家自然科学基金资助项目(51108176);湖南省研究生科研创新基金资助项目(CX2014B425;CX2015B571)

摘　　要：通过模型试验结合三维数值模拟的方法,探讨了在软土地基上碎石垫层和加筋碎石垫层的工作特性;分析了不同垫层厚度、土工格栅、格栅层数等参数变化,对碎石垫层和加筋碎石垫层变形模量、竖向应力场、沉降变形的影响。研究结果表明:1)土工格栅加筋垫层应力扩散效果明显强于纯碎石垫层,从而降低了垫层的总体沉降;2)垫层内部应力由底端向顶部发展,当荷载较小时,垫层底部先出现应力集中现象,随着荷载增大,应力集中区域向顶部靠近;3)随着格栅层数的增加,加筋垫层的应力集中区及沉降量的范围有所减小。By means of model test and 3D numerical simulation, discusses the working behaviors of gravel cushion and reinforced gravel cushion in the soft soil foundation respectively, and analyzes effects of the parameters of cushion thickness, geogrids and geogrid layers on the deformation modulus, vertical stress field and settlement deformation of gravel cushion and reinforced gravel cushion. The research results indicate that： 1）The stress diffusion effect of the reinforced gravel cushion of geogrids is obviously stronger than that of pure gravel cushion; 2）The internal stress of the cushion develops from bottom to top. When applying a small load, the cushion bottom appears stress concentration phenomenon, with the increase of load, the stress concentration area moves closly to the top of cushion; 3）With the increase of geogrid layers, the stress-concentration range and the settlement of reinforced gravel cushion reduced.

关 键 词：数值模拟 碎石垫层 土工格栅 软土地基 承载力 

分 类 号：TU447[建筑科学—岩土工程]