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为研究地震荷载作用诱发的场地土震陷问题,以辽西地区风积土为研究对象,进行了50年超越概率2%和10%的人工地震荷载及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人工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20m,场地可判别为中等震陷区;若计算深度为15 m,场地属轻微破坏区。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,具有一定的的工程应用价值。
In order to study the problem of earthquake subsidence caused by earthquake load, taking the aeolian soil in western Liaoning as the research object, the artificial seismic loads of 2% and 10% exceeding the 50% probability and the seismic subsidence of aeolian soils Based on the stratified summation method, the earthquake subsidence volume of the aeolian soil field under the artificial earthquake load is predicted, and the collapsible nature of the aeolian soil 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 result of seismic subsidence evaluation shows that if the calculated depth is 20m, the site can be judged as a moderately subsided area; if the calculated depth is 15m, the site is a minor damaged area. The above research results provide a reference for the earthquake-resistant and earthquake-resistant design of wind-blown soil foundation in western Liaoning and have certain engineering application value.