摘要
路基土体的动力学参数是铁路设计的重要依据之一。基于冻土特殊的物理力学性质以及在列车振动荷载作用下铁路路基严重破坏的事实,进行了冻土在不同围压、动应力幅值、温度以及含水量条件下的振动三轴试验,获得了冻土的动力学参数以及动剪切强度与上述条件的关系。试验结果表明:随着围压、动应力幅值的增加和温度的降低,土体的动剪切强度增加。在冻结条件下,随着土样含水量的增加,冻土的动剪切强度增加,这与未冻结土的动强度变化规律完全不同。
The kinetic parameter of subgrade soil is one of important bases of railway design. Based on special physic -mechanical properties of frozen soil and the fact that the railway subgrade is seriously damaged under the effect of vibration load of trains, dynamic triaxial test of frozen soil under different ambient pressures, dynamic stress amplitudes, temperatures and moisture contents is conducted and the kinetic parameter of frozen soil and the relation of dynamic shear strength with the above conditions are obtained. Test results show that： with the increase of ambient pressure and dynamic stress amplitude and decrease of temperature, the dynamic shear strength of soil increases ; under freezing condition, with the increase of water content in soil sample, the dynamic shear strength of frozen soil increases, which is different from the change rule of dynamic strength of unfrozen soil.
出处
《北方交通》
2012年第12期21-23,共3页
Northern Communications
关键词
冻土
路基
动荷载
动剪切强度
动应力幅值
Frozen soil
Subgrade
Dynamic load
Dynamic shear strength
Dynamic stress amplitude
