粗-细粒混合土动力特性探讨  

Investigation on dynamic mechanical properties of mixed soils composed of fine-coarse particles

作　　者：刘恩龙[1] 宋长航 罗开泰[1] 万里[1] 

机构地区：[1]四川大学水利水电学院,四川成都610055

出　　处：《世界地震工程》2010年第S1期28-31,共4页World Earthquake Engineering

基　　金：中科院山地灾害与地表过程重点实验室基金项目;国家自然科学基金项目(51009103)

摘　　要：对粗-细粒混合土样进行动三轴试验来探讨粗粒(1~2 mm)和细粒(小于0.075 mm)含量对混合土的动力特性的影响。共进行了细粒含量为0%、20%、40%、60%和80%5组试样的动三轴试验,得到了不同轴向激震力下的动强度、动应变和孔隙水压力的变化。试验发现:动强度随着细粒含量的增加先降低后增加,当细粒含量为20%时混合土的动强度是最低的;在动应力幅值比较大时,以粗粒为主的试样的孔压增长速度较快,而破坏时孔压的大小差别很小。Dynamic triaxial tests on mixed soil specimens of fine-coarse particles are conducted to investigate the inflnence of the contents of coarse soil particles(1～2 mm) and fine soil particles(smaller than 0.075 mm) to the dynamic features of these kinds of soils.Five sets of specimens with fine contents of 0%,20%,40%,60% and 80% are respectively tested using triaxial dynamic apparatus,and the dynamic strengths,the dynamic strains and the pore-water pressures are obtained when the spencimens are subject to different axial seismic loads.It is experimentally found that(i) as the contents of fine soil particles increase the dynamic strength would first increase and then decrease,and the dynamic strength would be minimum when the content of fine soil particle is 20% and(ii) when the amplitude of dynamic stress grows larger,the pore-water pressure of soil specimens with more contents of coarse particles would increase rapidly,but the differences between the pore-water pressures of the specimens are minor at failure.

关 键 词：细粒含量 混合土 动应力 动三轴试验 

分 类 号：TU435[建筑科学—岩土工程]