高速铁路路基粗粒土填料动静力力学特性试验研究  

Experimental Study on Dynamic and Static Mechanical Properties of Coarse-grained Soil Filled in High-speed Railway Subgrade

作　　者：王天亮[1,2] 张飞 宋宏芳[2] 卜建清[1,2] 尹赵爱 WANG Tianliang;ZHANG Fei;SONG Hongfang;BU Jianqing;YIN Zhaoai(State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures,Shijiazhuang Tiedao University,Shijiazhuang 050043,China;Key Laboratory of Roads and Railway Engineering Safety Control,Ministry of Education,Shijiazhuang Tiedao University,Shijiazhuang 050043,China)

机构地区：[1]石家庄铁道大学省部共建交通工程结构力学行为与系统安全国家重点实验室,河北石家庄050043 [2]石家庄铁道大学道路与铁道工程安全保障省部共建教育部重点实验室,河北石家庄050043

出　　处：《铁道学报》2022年第4期127-135,共9页Journal of the China Railway Society

基　　金：国家自然科学基金(51978426,41801277);河北省高层次人才资助项目(A201903010)。

摘　　要：考虑细粒含量和含水率的影响,开展高速铁路路基粗粒土的动静力力学特性试验,分析不同静荷载和围压作用下粗粒土填料的变形和强度演化特征,研究循环动荷载作用下粗粒土的动应力-动应变特性及累积塑性变形特征。研究结果表明,含水率较高时,细粒含量、围压等因素对粗粒土强度影响不明显,含水率较低时,细粒含量10%的粗粒土配比效果最优;动荷载作用下,含水率是致使粗粒土出现较大累积塑性变形的主要原因;细粒含量为5%的粗粒土抵抗累积塑性变形的能力最强。研究成果对高速铁路路基填料设计和高速列车安全运营具有重要的参考价值。Considering the influence of the fine-grained content and water content,the tests on the static and dynamic characteristics of coarse-grained soil in high-speed railway subgrade were conducted to analyze the deformation characteristics and strength evolution characteristics of coarse-grained soil under different static loads and confining pressures.The dynamic stress-strain characteristics and cumulative plastic deformation characteristics of coarse-grained soil under continuous dynamic loading were studied.The experimental results show that when the water content is high,the influence factors such as fine-grained soil content and confining pressure have little effect on the strength of coarse-grained soil.At the low water content,the coarse-grained soil with 10%fine-grained content has the best effect.Under the dynamic loading,the water content is still the main reason for the large cumulative plastic deformation of coarse-grained soil,and the coarse-grained soil with 5%fine-grained content has the best capability to resist the cumulative plastic deformation.The test results of this research have important reference value for the design of high-speed railway subgrade filling and safe operation of high-speed railway trains.

关 键 词：高速铁路 粗粒土填料 动静三轴试验 动应力 累积塑性应变 

分 类 号：O319.56[理学—一般力学与力学基础]