摘要
应用自主设计的铁路路基翻浆冒泥物理模型试验系统开展动-静组合荷载作用下砂-粉土混合料水分迁移试验研究。试验结果表明:动-静组合荷载作用下非饱和段内试样含水量呈明显增长趋势,孔隙水压力经历了动荷载作用下的累积和静荷载作用下的消散过程,并由此导致试样轴向形成孔隙水压力梯度,孔隙水在该宏观势能梯度作用下发生迁移流动。通过试验探究了铁路路基中“抽吸”作用的本质和发展过程,并基于此提出铁路路基翻浆冒泥病害的一个新的形成机理。
In the paper,a self-designed physical model test system is used to study the water migration of sandsilty mixture under dynamic-static combined load.The test results show that the water content of the sample increases obviously under the dynamic-static combined load,and the pore water pressure undergoes the process of accumulation under the dynamic load and dissipation under the static load,which leads to the formation of the pore water pressure gradient in the axial direction of the sample,and the pore water migrates and flows under the macro potential energy gradient.The paper explores the essence and development process of"suction"effect in railway subgrade through tests,and based on which the paper puts forward a new formation mechanism of mud pumping disease of railway subgrade.
作者
张升
高峰
ZHANG Sheng;GAO Feng(National engineering laboratory for high speed railway construction,Central South University,Changsha Hunan 410075,China;School of civil engineering,Central South University,Changsha Hunan 410075,China)
出处
《中国铁路》
2019年第11期83-88,共6页
China Railway
基金
湖南省自然科学基金（2017JJ1033）
湖湘高层次人才聚集工程创新人才项目（2018RS3016）
中南大学研究生自主探索创新项目（2019zzts293）
