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地震诱发的场地土的震陷问题引起了人们的广泛关注。以辽西地区风积土场地为研究对象,进行了50年超越概率2%和10%的地震荷载和3条不同幅值的等幅正弦荷载作用下风积土的震陷试验,建立了风积土震陷系数经验公式,依据分层总和法预测了2条地震荷载作用下风积土场地震陷量,并对其震陷性进行了评价。研究结果表明,震陷系数随动应力幅值、试件含水量和孔隙比的增加而增大,其中动应力幅值对震陷系数的贡献最大,其次为含水量和孔隙比。震陷评价结果表明,若计算深度为20 m,震陷量分别为5.99 cm和5.14 cm,可判别为中等震陷;若计算深度为15 m,震陷量分别为2.49 cm和2.14 cm,属轻微破坏。以上研究成果为辽西地区风积土地基的抗震防震设计提供了参考依据,具有重要的工程应用价值。
Earthquake-induced site of the Earth’s seismic collapse caused widespread concern. Taking the aeolian soils in western Liaoning Province as the research object, seismic subsidence tests of aeolian soils under 50% amplitude of 2% and 10% of the earthquakes and three amplitude of sinusoidal loads with different amplitudes were carried out to establish aeolian soil According to empirical formula of seismic collapse coefficient, the seismic subsidence of two aeolian soil fields under two earthquake loads is predicted by the layered sum method, and its collapsible nature is evaluated. The results show that the seismic collapse coefficient increases with the dynamic stress amplitude, water content and porosity ratio of the specimen, and the dynamic stress amplitude has the largest contribution to the seismic collapse coefficient, followed by the water content and void ratio. The results of the seismic subsidence evaluation show that if the calculated depth is 20 m and the amounts of the collapses are 5.99 cm and 5.14 cm respectively, it can be judged as a moderate subsidence; if the calculated depth is 15 m, the amounts of collapses are 2.49 cm and 2.14 cm respectively Slight damage. The above research results provide a reference for the earthquake-resistant and earthquake-resistant design of aeolian soils in western Liaoning and have important engineering application value.