铁道标准设计2024，Vol.68Issue(7)：70-77,8.DOI:10.13238/j.issn.1004-2954.202211220003
铁路粗粒土填料蠕变及颗粒破碎特性试验研究
Experimental Study on Creep and Particle Breakage Characteristics of Railway Coarse-grained Soil Filler
摘要
Abstract
Coarse-grained soil is widely used as railway subgrade filler,and its creep characteristics have great influence on the long-term settlement and service performance of subgrade.A series of two-dimensional creep tests are carried out by using the self-made coarse-grained soil filler unit model test system to explore the effects of vertical stress,rainfall infiltration and other factors on creep and particle breakage.After the test,the particle analysis of the sample is carried out,based on which a hyperbolic creep prediction model is established,which could simultaneously consider rainfall infiltration,breakage index Bg and load.Based on the determined static load distribution model and water content distribution formula,the creep deformation analysis model of coarse-grained soil subgrade is established,and the creep deformation of subgrade under different track types is analyzed.The results show that under the load of 50 kPa to 300 kPa,the strain of coarse-grained soil filler after creep stability is 0.05% to 0.101%,showing an increasing trend of attenuation.In the creep process,the particle breakage is mainly caused by large particle breakage,supplemented by grinding,and the particle breakage size of coarse-grained soil filler changes due to rainfall infiltration.The total change of particle content increases significantly with the increase of load,and then increases rapidly with the increase of rainfall infiltration intensity.The calculated values of creep prediction model are in good agreement with the experimental values,and the increase of subgrade creep deformation caused by rainfall infiltration can reach 80% .The research results can provide reference for deformation analysis of coarse grained soil subgrade of high-speed railway.关键词
铁路路基/粗粒土/蠕变/颗粒破碎/模型试验/降雨入渗Key words
railway subgrade/coarse grained soil/creep/particle breakage/model test/rainfall infil-tration分类
交通工程引用本文复制引用
王启云,康健,张丙强,魏心星,肖南雄,项玉龙..铁路粗粒土填料蠕变及颗粒破碎特性试验研究[J].铁道标准设计,2024,68(7):70-77,8.基金项目
福建省自然科学基金项目(2020J01884) （2020J01884）
湖南省教育厅科学研究项目优秀青年项目(21B0803) （21B0803）
湖南工学院科研启动基金项目(HQ21029) （HQ21029）
