冲击荷载作用下饱和粉土孔压发展规律及液化特性研究

对四川三溪村滑坡地区的覆盖层粉土进行试验研究,在循环周期荷载作用下通过改变振动频率等主观因素,分析其饱和重塑粉土液化特性.通过改变外界条件,包括围压、动应力以及振动频率等多个因素,研究饱和粉土的孔压变化,进而分析在不同冲击荷载作用下,粉土的液化程度.试验结果表明,在振动频率为5 Hz时,粉土极易发生液化,当频率在其他范围时则明显看出其液化程度降低;在同一围压下,粉土孔压随动荷载的增大呈现出逐渐降低的趋势,其液化程度逐渐降低.

Development Law of Pore Pressure of Saturated Silt and Its Liquefaction Behavior under Impact Loading

The paper analyzed the liquefaction behavior of saturated remodeling silt influenced by subjective factors such as the change of frequency under load effects in a cycle period after the research on the cover-ing layer of silt on the landslide areas in Sanxi Village in Sichuan .In addition ,the paper also studied the pore pressure change of saturated silt by changing external conditions ,including factors like confining pres-sure ,dynamic stress and frequency ,etc .,so as to further analyze the liquefaction degree of silt under differ-ent impact loading .The experiment results showed that when the frequency was 5 Hz ,the silt was pretty prone to be liquefied .In an area around 5 Hz ,it was obvious to see that the liquefaction degree decreased . However ,under the same confining pressure ,the pore pressure of the silt decreased with the increase of the dynamic loading and the liquefaction of the silt also decreased gradually .