摘要
通过应力控制式循环三轴试验,探讨了地铁行车荷载作用下饱和黄土的累积塑性应变.试验表明:饱和黄土累积塑形应变存在三个典型的发展阶段,即:衰减阶段、稳定阶段和破坏阶段.固结围压、循环试验中的排水条件、动应力及其循环次数、以及动应力比是影响饱和黄土累积塑性应变的重要因素.在排水循环三轴试验中,饱和黄土的累积塑性应变随初始固结围压的增大而减小,随循环次数、动应力和动应力比的增大而增大.基于试验数据,建立了预测饱和黄土累积塑性应变的反正切函数模型.该模型与试验数据符合良好,且仅需三个土体参数,应用比较方便.
Based on the stress control cyclic triaxial tests,the cumulative plastic strain of saturated loess due to metro traffic loading has been investigated under different consolidations.The develpoment of cumulative plastic strain can be divided into three stages,i.e.attenuation,stabilization and damage.The primitive consolidation pressure,drainage condition in cyclic triaxial tests,dynamic stress and its vibration times,and dynamic stress ratio are predominant factors in the development of cumulative plastic strain of saturated loess.In drained cyclic triaxial tests,the cumulative plastic strain of saturated loess will increase with the dynamic stress,vibration times,and dynamic stress ratio,but it will decrease with primitive consolidation pressure.Finally a calculation model was established to predict the cumulative plastic strain of saturated loess.This model requires only three parameters and matches the test data well.
出处
《西安建筑科技大学学报（自然科学版）》
CSCD
北大核心
2011年第3期316-322,共7页
Journal of Xi'an University of Architecture & Technology(Natural Science Edition)
基金
陕西省教育厅专项科研计划项目(09JK521)
陕西省科学技术研究发展计划项目(2010K11-05-01)
关键词
饱和黄土
地铁行车荷载
循环三轴试验
累积塑性应变
动应力比
saturated loess
metro traffic loading
cyclic triaxial test
cumulative plastic strain
dynamic stress ratio
