风积土震陷变形试验研究  

Experimental Study on Subsidence Deformation of Aeolian Soil under Seismic Loads

作　　者：张向东[1] 刘家顺[1] 

机构地区：[1]辽宁工程技术大学土木与交通学院,辽宁阜新123000

出　　处：《土壤通报》2014年第1期66-71,共6页Chinese Journal of Soil Science

基　　金：国家自然科学基金项目(50978131);辽宁省高等学校优秀人才支持计划项目(2008RC23)资助

摘　　要：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。Seismic subsidence of ground soil caused by seismic loads had drawn geotechnical workers＇ attention. Seismic subsidence test of Aeolian soil in western Liaoning Province had been conducted under seismic loads caused by exceeding 2% and 10% probabilities in the future 50 years and constant amplitude loads with 3 different dynamic amplitudes. The empirical formula of Aeolian soil seismic subsidence coefficient was established based on the 3 differ- ent dynamic constant amplitude tests data, by which Aeolian soil field subsidence values of 2 seismic loads were predicted in terms of layerwise summation method and its seismic subsidence characteristics was assessed. The results showed that seismic subsidence coefficient increased with the increasing of dynamic stress amplitude, water content and void ratio, meanwhile, the dynamic stress amplitude had the biggest contribution to the seismic subsiden, followed by water content and then void ratio. The evaluation results of seismic subsidence indicated that the seismic subsidence values of 2 seismic loads were 5.99 cm and 5.14 cm, respectively. If the calculation depth was at 20m, it would be discriminated as intermediate subsidence area. While if it was at 15m, the seismic subsidence values were 2.59 cm and 2.14 cm, which would be discriminated as slight subsidence area. Overall, the research results would provide ref- erences to the seismic design of Aeolian soil region in western Liaoning Province and had very important engineering practical values.

关 键 词：震陷系数 地基 风积土 地震荷载 试验 

分 类 号：TU478[建筑科学—结构工程]