结构性和相对密度对南京细砂抗液化强度的影响  

Effects of Relative Density and Structural Properties on Liquefaction Resistance of Nanjing Fine Sand

作　　者：王炳辉[1] 刘建达[2] 陈国兴[1] 

机构地区：[1]南京工业大学岩土工程研究所,南京210009 [2]江苏省地震工程研究院,南京210014

出　　处：《防灾减灾工程学报》2007年第4期383-388,400,共7页Journal of Disaster Prevention and Mitigation Engineering

基　　金：国家自然科学基金项目(50578076);江苏省六大人才高峰计划(2006)

摘　　要：结合南京长江四桥工程场地的液化试验结果,分析了相对密度和结构性对南京细砂抗液化强度的影响:重塑南京细砂的抗液化强度与相对密度具有较好的一一对应性,且随着相对密度增大而增大;结构性的存在使南京细砂原状砂样比重塑砂样具有更高的抗液化强度,但随着循环荷载的减小和振动作用次数的增加,两者的抗液化强度逐渐接近;由于结构性的影响,不同相对密度的原状南京细砂的抗液化强度有可能相同。An experimental study on Nanjing fine sand was performed.The dynamic triaxial test results show that the liquefaction resistance has perfect correlation with the relative density for reconstituted samples.The value of the liquefaction resistance increases with the increase of the value of relative density of sample.The liquefaction resistances of the undisturbed samples are larger than those of reconstituted samples,and this difference will be reduced while the peak value of dynamic load decrease.Due to the existence of natural structural property,Nanjing fine sand samples with different relative densities may have the same liquefaction resistance.

关 键 词：南京细砂 液化试验 相对密度 结构性 影响因素 

分 类 号：TU441.31[建筑科学—岩土工程]