CAJ | 학술논문

利用DDS-70微机控制电磁式振动三轴仪,在均压固结条件下对福建标准砂进行了不同振动频率的循环三轴试验,研究了振动频率对其动力特性的影响.研究表明:在围压相同且均压固结条件下,饱和松砂的动强度随着振动频率的增大而增大;达到同一峰值孔压的水平,振动频率越高,所需要的振次越多;对应于相同的轴向动应力,动轴向应变随着振动频率的增加,达到5%的应变所需的振次增多,动轴向应变与动孔压的发展不是一致的.振动频率越高,达到液化所需要的振动时间急剧减少,较高频率比较低频率的动荷载作用更能迅速地使饱和砂土达到某一变形、孔压和强度发挥水平,也使饱和砂土产生液化的可能性显著增大.
이용DDS-70미궤공제전자식진동삼축의,재균압고결조건하대복건표준사진행료불동진동빈솔적순배삼축시험,연구료진동빈솔대기동력특성적영향.연구표명:재위압상동차균압고결조건하,포화송사적동강도수착진동빈솔적증대이증대;체도동일봉치공압적수평,진동빈솔월고,소수요적진차월다;대응우상동적축향동응력,동축향응변수착진동빈솔적증가,체도5%적응변소수적진차증다,동축향응변여동공압적발전불시일치적.진동빈솔월고,체도액화소수요적진동시간급극감소,교고빈솔비교저빈솔적동하재작용경능신속지사포화사토체도모일변형、공압화강도발휘수평,야사포화사토산생액화적가능성현저증대.
@@@@A series of cycling triaxial experiments of different vibration frequencies for the standard land in Fujian are ac-complished by using DDS-70 microcomputer control electromagnetic vibration triaxial apparatus under the condition of e-qual consolidation ,so as to study the effect of vibration frequencies on its dynamic behaviors .The study results show that the dynamic strength of saturated loose sands is increased with the increasing of vibration frequency under the condition of same ambient pressure and equal consolidation .The vibration frequency is bigger with higher vibration frequency in order to reach the peak pore pressure .Corresponding to the same axial dynamic stress ,the vibration frequency is increased to reach 5% of dynamic axial strain with the increasing of vibration frequency .The development of dynamic axial strain and dynamic pore pressure is not consistent .It takes less time to reach the liquefaction with higher vibration frequency .The dynamic load of high vibration frequency can more quickly make the saturated loose sands reach some level of deforma-tion ,pore pressure and strength than that of low vibration frequency .The possibility of liquefaction for saturated loose sands is also much increased .