摘要
通过对汶川细砂在不同循环应力比下的等压固结不排水动三轴试验,着重研究了考虑初始孔隙比对饱和砂土的动强度与孔压特性影响,建立了不同有效围压下的动抗剪强度表示方法,比较了一定振次下的动强度指标,为抗震设计提供参考与借鉴.从孔压随荷载循环次数变化和一定振次下液化所需的循环应力比这两种角度研究孔压特性,结果表明:相对密实度对砂土抗液化能力有着显著影响,孔压的发展取决于初始孔隙比,循环应力比越高时,表现得越明显.
According to undrained dynamic triaxial tests of Wenchuan fine sand under isotropic consolidation under different cyclic stress ratios, the dynamic strength and pore pressure characteristics of the saturated sands with initial void ratio are studied. A method to determine the dynamic strength is suggested under different effective confining pressures. The values of the dynamic strength index is compared under the number of cycles; so as to offer reference for seismic design in practical engineering. The pore pressure characteristics are studied from the pore pressure varying with the load cycles and the cyclic stress ratio required to induce liquefaction for given number of cycles of loading. The results show that the relative density of sand has a significant impact on liquefaction resistance. The excel pore water pressure generation depends on the initial void ratio and is more prounced for higher cyclic stress ratio values.
出处
《三峡大学学报（自然科学版）》
CAS
2014年第2期68-71,共4页
Journal of China Three Gorges University：Natural Sciences
基金
国家自然科学基金面上项目(51278382)
关键词
饱和砂土
循环应力比
初始孔隙比
动强度
孔压
saturated sands
cyclic stress ratio
initial void ratio
dynamic strength
pore pressure
