粉粒含量对粉土场地液化后变形影响的试验研究

Experimental Study on the Influence of Silt Particle Content to Post-liquefaction Deformation in Silt Ground

摘要:

利用全自动多功能三轴仪进行了粉土场地的液化后变形试验,探讨了粉粒含量对液化后应力应变关系的影响。试验时施加动加载使试样达到设定的液化程度,然后立即施加单调荷载,以模拟地震现场发生强震时初始液化到液化后变形的整个过程。研究发现,不同粉粒含量粉土场地发生液化后变形得到的液化后应力应变关系可采用推导的同一理论关系式表示,其系数的差异表明了粉粒含量对粉土液化后变形的影响。验证结果表明该关系式能较好地模拟粉粒含量对粉土场地液化后应力-应变的影响,为同一地区或相似地区粉粒含量变化的粉土场地液化评估提供依据。

Abstract:

Many silt post-liquefaction deformation tests are carried out in a new universal triaxial apparatus of Hehai University in order to study the influence of silt particle content on post-liquefaction stress-strain relationships. The whole process from liquefaction to post-liquefaction deformation in a strong shock is simulated by forcing dynamic loading to some severity liquefaction and then forcing monotonic loading. The stress-strain relationship for different silt particle contents of silt soil can be demonstrated by same formula. It is found that the influence of silt particle content can be obtained only from analyzing the coefficients of the formula. The results predicted by the formula compared favorably with experiment observation.