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《地震研究》[ISSN:1000-0666/CN:53-1062/P]

卷:

39

期数:

2016年04

页码:

692-702

栏目:

出版日期:

2016-10-30

文章信息/Info

Title:

Review on Disaster Characteristics of the Seismic Subsidence of Loess Site and its Formation Causes

作者:

王 强¹; 2; 邵生俊²; 王 峻¹; 张振中¹

(1.中国地震局兰州地震研究所,甘肃 兰州 730000; 2.西安理工大学 岩土工程研究所,陕西 西安 710048)

Author(s):

WANG Qiang¹; 2; SHAO Shengjun²; WANG Jun¹; ZHANG Zhenzhong¹

(1.Lanzhou Institute of Seismology,CEA,Lanzhou 730000,Gansu,China)(2.Institute of Geotechnical Engineering,Xi'an University of Technology,Xi'an 710048,Shaanxi,China)

关键词:

场地震害;  黄土震陷;  历史地震;  物性指标;  临界动应力

Keywords:

earthquake disaster of site;  seismic subsidence of loess;  historical earthquake;  physical indexes;  critical dynamic stress

分类号:

P315.9

DOI:

-

摘要:

基于文献史料记载和现场科考成果,考证了黄土地区几次中强以上地震引发的黄土震陷灾害,分析了黄土震陷灾害的破坏模式、发育特征及其形成条件。依据大量不同地区黄土的动三轴试验结果,比较分析了黄土震陷形成的物性指标的区域性变化规律,并进一步研究了震陷临界动应力的影响因素。研究显示,黄土地区的几次中强以上地震的极震区均有黄土震陷事例; 黄土震陷的灾害模式可区分为振密型震陷、震陷型滑坡和液化型震陷,并由土性条件、地形地貌和地震动作用形式决定; 孔隙比大于0.8时,黄土高原地区的黄土需要考虑不同含水量条件下的震陷性,而黄土高原地区东南部的河南、河北和晋东南地区的黄土则可根据缩限含水量判定其震陷性; 临界动应力的大小由黄土的结构强度所主导,临界动应力比与含水量之间存在很好的幂函数关系。

Abstract:

Based on many historical materials and scientific investigations,we studied the seismic subsidence damages of loess induced by several moderately strong and strong earthquakes at loess area,and analyzed the damage types,developing characteristics and formation conditions of the loess seismic subsidence disaster.Then according to a large amount of dynamic triaxial test results on different regional loess,we comparatively investigated the variation laws of regional physical indexes,which meet the occurrence conditions of seismic subsidence of loess,furthermore,we researched several influencing factors of critical dynamic stress and presented variation laws between them.It can be concluded from this study that the loess subsidence cases of loess which were occurred at meizoseimal area of several moderately strong and strong earthquakes are confirmed.The mode of the seismic subsidence damage of loess can be classified into vibrated-compact seismic subsidence,seismic-subsidence landslide,and liquefaction seismic subsidence,whose formation are determined by the physical conditions of soil,terrains and landforms,and earthquake motion.The loess at loess plateau should take account of the seismic subsidence of loess under all water content levels once void ratio is larger than 0.8,while for loess distributed at Henan,Hebei and southeastern Shanxi provinces,the seismic subsidence of loess can be judged by shrinkage limit.The critical dynamic stress is mainly dependent on the structural strength,and critical dynamic stress ratio can be well expressed with the power function of water content.

参考文献/References:

-

备注/Memo

备注/Memo:

收稿日期:2015-11-24
基金项目:中国地震局地震预测研究所基本科研业务费项目(2014IESLZ02、2015IESLZ05)联合资助.

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更新日期/Last Update: 2016-10-30