摘要
由于适应变形的能力较差,非饱和黄土在常规动三轴试验中一般难于得到较为准确和具有较好规律性的试验结果。提出的应用动扭剪三轴仪对非饱和黄土动力特性进行试验的方法,避免了常规动三轴仪振动过程中的固有缺陷。将该方法应用于对杨凌非饱和黄土在不同湿度条件下进行了动强度及动模量和阻尼比试验,试验过程中实现了对非饱和黄土的孔隙水压力和孔隙气压力的动态测量,试验结果取得了比较明显的规律性。
Using the methods of soils dynamics to study the dynamic characteristics of unsaturated loess in-depth has very important significance not only for reducing and preventing disasters but also for design and evaluation of resisting projects vibration.Owing to the poor adaptation deformation capability of unsaturated loess,it＇s difficult to obtain data of dynamic characteristics tests with better precision and better regularity under condition of routine dynamic triaxial tests.The methods for dynamic characteristics tests of unsaturated loess are applied in this paper,the inherent disfigurements in routine dynamic triaxial tests are avoided.That is using the dynamic torsional shear apparatus,the tests of dynamic strength,dynamic modulus and damping ratio of Yangling unsaturated intact loess are carried out by using torsional cyclic load triaxial apparatus under different moisture condition,and the pore water pressure and pore air pressure of unsaturated intact loess are measured in testing process,as well as the obvious regularity are acquired from the study results.
出处
《地下空间与工程学报》
CSCD
2007年第6期1041-1046,共6页
Chinese Journal of Underground Space and Engineering
基金
国家自然科学基金资助项目(50578134)
教育部新世纪优秀人才支持计划(2006)资助项目
关键词
非饱和黄土
动力特性
孔隙压力
试验方法
unsaturated loess
dynamic characteristics
pore pressure
test method
