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黄土地区铁路建筑物在进行地震和列车动荷载反应分析时,需要合理地确定黄土的动力参数。应西(安)延(安)铁路建设的需要,笔者用DTC—240三轴仪测定了原状黄土动剪切模量、阻尼比及动强度指标;并用统计方法分析黄土动应力应变关系;得到适用于原状黄土哈丁(Hardin)公式的系数。试验还研究试件高径比对弹性模量的变化,分析不同固结比与固结压力对阻尼比和动强度的影响,并探讨其变化规律与原状黄土结构的内在联系。
When analyzing the response of earthquakes and train dynamic load in railway buildings in loess area, it is necessary to reasonably determine the dynamic parameters of loess. In response to the need for railway construction in Xi’an (An) (Yan) Railway, the author used the DTC-240 triaxial apparatus to measure the dynamic shear modulus, damping ratio, and dynamic strength index of the undisturbed loess, and used a statistical method to analyze the dynamic stress-strain relationship of the loess; The coefficient applied to the original Loess Hardin formula. The test also studied the change of the elastic modulus of the specimen height-diameter ratio, analyzed the effect of different consolidation ratio and consolidation pressure on the damping ratio and dynamic strength, and discussed the internal relationship between the variation law and the original loess structure.