摘要
对在不同速率冲击荷载下,原状粉土、粉砂土及粉质粘土在不同围压下的三轴试验进行了说明,对在一定围压下不同加载速率对土样强度特性的影响进行了研究。结果表明,对于粉土及粉砂土,在一定围压下,土样的应力-应变曲线随冲击荷载速率的增大而升高,表现为强度的增大;对粉质粘土,在一定的围压下,土样的应力应变曲线随冲击荷载速率的增大而降低,表现为强度的降低;对不同种类的土,在相同的冲击荷载速率下,土样的抗剪强度都随围压的增大而增大。
Some triaxial tests are carried out of undisturbed silt,silty-sand and silty-clay,these tests are worked out under impact loading on diffient rates at certain pressure.The study focuses on the effect of the loading rate on strength of the soil.It reveals that for silt and silty-sand the relationship curve between stress and strain increases when the rate of the impact loading increases in the triaxial tests.And this leads to enlargement of strength.But the curve decreases for the silty-clay.The study also shows that the relationship curve between stress and strain increases at the same rate of impact loading when the confining pressure increases for different kinds of silty.
出处
《实验室科学》
2011年第2期108-113,共6页
Laboratory Science
基金
北京交通大学横向科研课题(2009)
关键词
粉砂土
冲击荷载
抗剪强度
应力应变关系
silty-sand
impact loading
shear strength
stress-strain relationship
