摘要
为研究冻融作用对重载铁路路基粉土填料静动力学特性的影响,对冻融前后神朔铁路粉土填料进行了静动三轴剪切试验。试验结果表明:该粉土的动、静强度均随着冻融次数的增加而逐渐减小;当冻融次数相同时,试样的静强度大于动强度;动、静黏聚力随冻融次数先减小后趋于稳定,而动、静内摩擦角随冻融次数先增大后趋于稳定;试样的静黏聚力小于动黏聚力,静内摩擦角大于动内摩擦角;该粉土的动初始弹性模量随冻融次数先降低后趋于稳定,而静初始弹性模量随冻融次数先增大后趋于稳定;当冻融次数相同时,试样的动初始弹性模量大于静初始弹性模量;冻融后试样的等效剪切模量小于未冻融试样;冻融作用对该粉土的等效剪切模量的影响主要集中在前5次冻融循环。
In order to study the effect of freeze-thaw on the static and dynamic mechanical properties of silt filler for heavy haul railway subgrade,static and dynamic triaxial shear tests were carried out on Shenmu-Shuozhou railway silt filler before and after freeze-thaw cycle.The results show that the dynamic and static strength of the silt decreases with the increase of freeze-thaw times.When the freeze-thaw times are the same,the static strength is greater than the dynamic strength.The dynamic and static cohesion decreases first and then tends to be stable with the freeze-thaw times,while the dynamic and static internal friction angle increases first and then tends to be stable with the freeze-thaw times.The static cohesion of the specimens is less than the dynamic cohesion,and the static internal friction angle is greater than the dynamic internal friction angle.The dynamic initial elastic modulus of the silt decreases first and then tends to be stable with the freeze-thaw times,while the static initial elastic modulus increases first and then tends to be stable with the freeze-thaw times.When the freezethaw times are the same,the dynamic initial elastic modulus is greater than the static initial elastic modulus.The equivalent shear modulus of the freeze-thaw specimens is smaller than that of unfrozen specimens.The effect of freeze-thaw on the equivalent shear modulus of the silt is mainly concentrated in the first five freeze-thaw cycles.
作者
王永霞
WANG Yongxia(The 2nd Engineering Co.Ltd.of China Railway 12th Bureau Group,Taiyuan 030032,China)
出处
《铁道建筑》
北大核心
2020年第11期88-92,共5页
Railway Engineering
关键词
重载铁路
路基
试验研究
力学特性
粉土
弹性模量
等效剪切模量
heavy haul railway
subgrade
experimental study
mechanical properties
silt
elastic modulus
equivalent shear modulus
