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通过将郑西客运专线不同地段地震危险性分析中人工合成的地震波直接输入动三轴,对该客运专线不同地段原状黄土试样进行震陷试验,研究黄土在随机地震荷载作用下的震陷特性。根据震陷试验结果,利用黄土震陷试验预测方法对该客运专线黄土路基在未来地震中是否发生震陷进行判断,分别给出50 a超越概率10%和2%的震陷量预测结果。试验结果表明,HYCD,TGCD,LBCD三个场地的土属于震陷性黄土,震陷临界动应力在70 k Pa左右,这些场地应根据黄土震陷量的大小,采取合理、有效的地基抗震措施;而YSCD场地的土属于非震陷性黄土。研究区黄土在中、强地震作用下,震陷主要发生在Q3地层中。
By inputting the synthetic seismic waves directly into the three axes in the seismic risk analysis of different sections of the Zheng-Xi Passenger Special Line, the original loess samples in different sections of the passenger dedicated line are subjected to a seismic collapse test to study the seismic subsidence characteristics of the loess under random earthquake loads . According to the results of seismic subsidence test, the loess subsidence test prediction method is used to judge whether there is any subsidence in the future earthquakes for the loess subgrade of passenger dedicated line, and the prediction results of the subsidence amount of 10% and 2% of the 50% The test results show that the soil of HYCD, TGCD and LBCD belong to collapsible loess, and the critical dynamic stress of the earthquake collapse is about 70 kPa. These sites should be based on the magnitude of the loess collapse and take reasonable and effective foundation aseismic measures ; While the soil of YSCD site belongs to non-collapsible loess. In the loess area of study, under the action of moderate and strong earthquakes, the subsidence occurs mainly in the Q3 formation.