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地震液化常给人们带来巨大损失,而剪切振动和循环荷载作用下的动力学效应常被认为是地震液化的主要原因,人们对剪切荷载作用下饱和砂土的液化问题进行了较多的研究,而对循环荷载作用下砂土液化的动力学效应研究较少。胶新铁路在DK39+000开始为高地震烈度区,DK283+550~DK283+770分布有地震可液化层,工程修建后列车动荷载的影响将会有诱发砂土液化的可能性。为了研究通车前自然沉降特征和通车后循环荷载作用下的路基沉降变形规律,本文在具体分析了砂土液化的概念和准则判别的基础上,重点分析了砂土液化区路基沉降特征,包括测试断面竖向分层沉降变形特征分析和路基水平位移特征分析。最后在试验的基础上,从理论上给出了循环荷载下砂土的本构关系。
Earthquake liquefaction often brings huge loss to people. However, the dynamic effects of shear vibration and cyclic loading are often considered as the main causes of earthquake liquefaction. There is more liquefaction problem of saturated sand under the action of shear load However, there are few studies on the kinetic effect of sand liquefaction under cyclic loading. Jiaoxin Railway starts from high seismic intensity zone DK39 + 000, and there is an earthquake liquefiable layer distributed between DK283 + 550 ~ DK283 + 770. The impact of dynamic load on the train after the construction of the project will have the possibility of inducing sand liquefaction. In order to study the natural settlement before opening and the law of subgrade settlement and deformation under the cyclic loading, the paper analyzes the subsidence characteristics of sandy soil liquefaction area on the basis of concretely analyzing the concept and criteria of sand liquefaction, including the test Analysis of Deformation Character of Vertical Stratified Settlement and Analysis of Horizontal Displacement of Subgrade. Finally, based on the experiment, the constitutive relation of sand under cyclic loading is given theoretically.