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以郑(州)—西(安)高速铁路为例,选择潼关段为研究区,采集大量原状黄土样品,将合成的人工地震动输入到动三轴,进行了固结不排水的动三轴实验,估算了黄土路基的震陷量。建立了高速铁路黄土路基动力学数值模型,研究了50年10%和2%的超越概率水平的地震作用下黄土路基的永久变形,以及地基处理后黄土地基的永久变形。结果显示,沉降主要发生在Q3黄土中,强夯、DDC桩等地基处理措施可以有效的减少地基黄土的沉降变形,但是当处理深度不够时,在强地震作用下仍然可以产生较大沉降。研究成果为地基抗震处理提供了依据。
Taking Zheng-Zhou-Xi (An) high-speed railway as an example, the Tongguan section was selected as the study area, a large number of undisturbed loess samples were collected, the synthetic artificial ground motion was input to the moving triaxial axis, and the consolidated undrained dynamic triaxial Experiments have estimated the amount of seismic subsidence of loess subgrade. The dynamic numerical model of loess subgrade in high-speed railway is established. The permanent deformation of loess subgrade under earthquake and the permanent deformation of loess foundation after foundation treatment are studied under 10% and 2% overrun probabilities for 50 years. The results show that the subsidence mainly occurs in Q3 loess. The treatment measures such as dynamic compaction and DDC pile can effectively reduce the subsidence deformation of the loess foundation. However, when the depth of treatment is not enough, large subsidence can still occur under strong earthquake. The research results provide the basis for the seismic treatment of foundation.