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黄土震陷研究及相关问题探讨
王强1,2,3,4, 孙军杰1,2,3,4, 王兰民1,2,3,4, 陈秀清5
1.甘肃省地震局(中国地震局黄土地震工程重点实验室),兰州730000;2.中国地震局兰州地震研究所,兰州730000;3.甘肃省岩土防灾工程技术研究中心,兰州730000;4)甘肃有色工程勘察设计研究院,兰州730000;5.甘肃有色工程勘察设计研究院,兰州730000
摘要:
回顾了黄土震陷30多年间的研究工作和成果。黄土震陷已为微结构特征、动三轴和现场爆破试验所证实,成为黄土地震工程研究领域的一项重要课题,但仍缺少典型震例,且停留在饱和土理论研究阶段。应用微结构形态学方法表征土体结构性变得困难,土力学方法将是微结构应用于震陷性研究的有效途径。震陷性判定仅是在多个参变量值区间内的确定性判定,概率性震陷预测应得到开展。震陷系数估算多是基于室内试验数据的经验公式或半经验半理论公式,没能从其物理过程和力学机制出发,存在参变量多、计算繁琐和实用性差等问题,这需要从黄土震陷的物理力学机制出发,厘清影响黄土震陷的主导因素及其表征参变量,建立具有物理力学意义的数学理论估算模型。抗震陷处理技术的关键是消除土体的震陷性,并减缓震陷时土与土工结构物的相互作用。
关键词:  黄土震陷  震陷机理  震陷性判定  震陷量估算  微结构
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Review and Discussion on Seismic Subsidence of Loess1
Wang Qiang1,2,3,4, Sun Junjie1,2,3,4, Wang Lanmin1,2,3,4, Chen Xiuqing5
1.Key Laboratory of Loess Earthquake Engineering,Earthquake Administration of Gansu Province,Lanzhou 730000,China;2.Lanzhou Institute of Seismology,CEA,Lanzhou 730000,China;3.Geotechnical Disaster Prevention Engineering Technology Research Center of Gansu Province,Lanzhou 730000,China;4) Gansu Non-ferrous Engineering Exploration and Design Research Institute,Lanzhou 730000,China;5.Gansu Non-ferrous Engineering Exploration and Design Research Institute,Lanzhou 730000,China
Abstract:
The research and achievements made on seismic subsidence of loess,obtained over the past 30 years,were reviewed. Seismic Subsidence of Loess ( SSL ) has been verified by microstructure characteristics,dynamic triaxial experiments,and in-situ explosion tests, and has become an important subject in the field of seismic loess engineering research. While,the research is still in the stage of theoretical study of saturated soil,and there are no representative cases of seismic subsidence of loess in historical earthquakes. It is difficult to express structure characteristics using microstructure morphology. While,soil mechanics are available methods for this. Seismic subsidence judgment is absolute in some certain value ranges for several parameters. Therefore,probabilistic judgment should be developed. The seismic subsidence ratio is estimated mostly by empirical formulas or semiempirical and semi-theoretical formulas,which are based on laboratory data. These formulas are not established on the basis of physical process and mechanics of seismic subsidence,and this leads to more variables, complicated computation, and poor practicability. To solve these problems,we need to distinguish the main factors and corresponding variables,to establish a mechanics model for seismic subsidence estimation, and to characterize its physio-mechanical process. The key of anti-seismic subsidence treatment is to reduce the seismic subsidence property of soils,and to lower the interaction between the soil body and underground structures.
Key words:  Seismic Subsidence of Loess ( SSL )  Mechanism of seismic subsidence  Seismic subsidence assessment  Estimation of seismic subsidence amount  Microstructure