| 考虑土体性质的黄土震陷灾害区域性特征 |
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| 引用本文： | 许书雅,王平,王会娟,于一帆.考虑土体性质的黄土震陷灾害区域性特征[J].西北地震学报,2020,42(5):1194-1201. |
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| 作者姓名： | 许书雅 王平 王会娟 于一帆 |
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| 作者单位： | 中国地震局地球物理勘探中心, 河南 郑州 450000;中国地震局(甘肃省) 黄土地震工程重点实验室, 甘肃 兰州 730000 |
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| 基金项目： | 基本科研业务费专项（2020IESLZ07）；甘肃省重点研发计划（18YF1FA101）；地震联合基金（U1939209）资助 |
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| 摘 要： | 本研究在通渭、兰州、西吉、宝鸡、西安等多个西北典型黄土震陷灾害场地获取原状土样，通过对密度、含水率、孔隙比、塑液限等物理指标的测试，分析其与土体震陷性的关系；通过动弹性模量和阻尼比、动强度、震陷等室内动力特性试验，并结合大量前人研究资料，分析土体性质对岩土震陷灾害的区域性影响。结果表明：1）震陷系数与单一土体物性参数呈正相关或负相关关系，六盘山以西和以东的黄土震陷特性反映了明显的地区变化规律，在相同地震荷载作用下震害东轻西重；2）随着时间的推移，人类的活动增加，改变了土的含水率，导致土体上覆压力增大，在上覆压力的作用下，土体的初始孔隙数量有所减少，其固结程度越来越好，宏观表现为土体的易损性即震陷性减小。
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| 关 键 词： | 黄土震陷灾害 土体性质 土体易损性 区域特征 |
| 收稿时间： | 2020/7/10 0:00:00 |
Regional Characteristics of the Earthquake Subsidence Disaster in Loess Area Based on Soil Properties |
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| XU Shuy,WANG Ping,WANG Huijuan,YU Yifan.Regional Characteristics of the Earthquake Subsidence Disaster in Loess Area Based on Soil Properties[J].Northwestern Seismological Journal,2020,42(5):1194-1201. |
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| Authors: | XU Shuy WANG Ping WANG Huijuan YU Yifan |
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| Institution: | Geophysical Exploration Center, CEA, Zhengzhou 450000, Henan, China;Key Laboratory of Loess Earthquake Engineering, Gansu Province&CEA, Lanzhou 730000, Gansu, China |
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| Abstract: | Based on physical indexes such as density, moisture content, pore ratio, and plastic limit, the relationship between each physical index and soil vulnerability was analyzed. Undisturbed soil samples in Tongwei, Lanzhou, Baoji, Xiji, Xi''an, and other typical loess disaster sites were used as the research object. Through an indoor dynamic characteristics test and based on the findings of numerous previous studies, the regional effects of soil properties on geotechnical subsidence disasters were quantitatively analyzed. The results showed the following: (1) A positive or negative correlation exists between the seismic subsidence coefficient and individual soil physical property. The seismic subsidence characteristics in the west and east of the Liupan Mountain present a regional law: the disaster distribution is characterized as light in the south and heavy in the east under the same seismic load. (2) Over time, the increase in the number of human activities changes the soil moisture, increasing the overburden pressure of soil. Under the action of the overburden pressure of soil, the number of initial soil pores decreases, and the consolidation degree increasingly improves. Macroscopically, this result shows that the soil vulnerability is reduced, and thus, the seismic subsidence is reduced. |
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| Keywords: | seismic subsidence disaster of loess soil properties soil vulnerability regional characteristics |
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