论文部分内容阅读
根据辽西地区的地震资料和波速测试资料,通过动三轴试验,进行了地震冲击荷载和列车振动荷载两种动荷载作用下辽西风积土地基的动力特性试验研究。研究结果表明,风积土的动强度、动变形和动模量等指标与荷载类型、持续时间、振动频率和动应力幅值等条件有关。在地震荷载作用下,动荷载频率和动应力幅值越大、震动持续时间越长,其产生的动应变越大;在高速列车振动荷载作用下,土的动强度和动抗剪强度随振动次数的增加而降低;固结比相同时,动弹性模量Ed和动剪切模量Gd随固结压力的增大而增大;随动应变εd的增大而减小,且初始时刻减小速度明显,之后逐渐变缓。
According to the seismic data and the wave velocity test data in western Liaoning, dynamic characteristics of the aeolian soils in western Liaoning are investigated by dynamic triaxial tests under the action of earthquake impact loads and train vibration loads. The results show that the dynamic strength, dynamic deformation and dynamic modulus of aeolian soil are related to the conditions of load type, duration, vibration frequency and dynamic stress amplitude. Under the action of earthquake load, the greater the dynamic load frequency and the dynamic stress amplitude, the longer the duration of vibration, the greater the dynamic strain. The dynamic and shear strength of soil under the vibration load of high-speed train increases with the vibration The elastic modulus Ed and the dynamic shear modulus Gd increase with the increase of consolidation pressure, decrease with the increase of dynamic strain εd, and the initial time decreases Small speed obvious, then gradually slow.