黄土高原河谷城市潜在地震液化特征及灾害预测
发布时间：2018-10-25 11:28
【摘要】：以天水市区为例,在研究区内采集砂土和原状黄土试样,通过对所取试样的室内动三轴液化试验结果进行分析,探讨黄土高原河谷城市的土壤地震液化特征。采用Seed-Idriss简化判别法,对研究区内土壤在不同等效烈度地震作用下的液化势进行判别,并结合黄土高原河谷城市的地形地貌和地质构造特征,对黄土高原河谷城市土壤地震液化灾害进行预测。结果表明:黄土高原河谷城市的饱和土体在地震作用下,由于黄土质地疏松,抗液化强度更低,在Ⅶ度的地震作用下即可液化;液化不会产生喷水现象,但易导致滑坡和泥流灾害,其抗液化强度主要受密度和塑性指数的影响。砂土在Ⅷ度及以上地震作用下液化,且存在喷水冒砂现象,可导致地面开裂、地基不均匀沉降和建筑地基失稳破坏;粒径为影响砂土液化的最主要因素,粉砂比细砂更易液化。
[Abstract]:Taking Tianshui City as an example, sand soil and undisturbed loess samples were collected in the study area. The seismic liquefaction characteristics of the urban soil in the valley of the Loess Plateau were analyzed by analyzing the results of the indoor dynamic triaxial liquefaction test of the samples taken. The liquefaction potential of soil in the study area under the action of earthquake with different equivalent intensity was determined by using Seed-Idriss simplified discriminant method, and combined with the characteristics of topography and geological structure of the valley city on the Loess Plateau. The earthquake liquefaction disaster of urban soil in the valley of the Loess Plateau was predicted. The results show that the saturated soil in the valley city of the Loess Plateau is liquefaction under earthquake because of the looseness of loess texture and the lower liquefaction resistance, and the liquefaction will not produce the phenomenon of spraying water under the earthquake action of 鈪，
本文编号：2293573
[Abstract]:Taking Tianshui City as an example, sand soil and undisturbed loess samples were collected in the study area. The seismic liquefaction characteristics of the urban soil in the valley of the Loess Plateau were analyzed by analyzing the results of the indoor dynamic triaxial liquefaction test of the samples taken. The liquefaction potential of soil in the study area under the action of earthquake with different equivalent intensity was determined by using Seed-Idriss simplified discriminant method, and combined with the characteristics of topography and geological structure of the valley city on the Loess Plateau. The earthquake liquefaction disaster of urban soil in the valley of the Loess Plateau was predicted. The results show that the saturated soil in the valley city of the Loess Plateau is liquefaction under earthquake because of the looseness of loess texture and the lower liquefaction resistance, and the liquefaction will not produce the phenomenon of spraying water under the earthquake action of 鈪，
本文编号：2293573
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