西北地震学报2011，Vol.33Issue(z1)：71-76,6.
非饱和黄土震陷物理力学机制与主导影响因素
Study on the Physical-mechanical Mechanism and Dominant Influence Factors of Unsaturated Loess Subsidence under Seismic Loading
摘要
Abstract
Based on the comprehensive analysis of physical process and mechanical mechanism of loess seismic subsidence, the seismic subsidence of unsaturated loess could be described as a consolidation response of generalized solid-phase-media of soil mass under external dynamic loading. The dominant influence factors of loess seismic subsidence should include two aspects, which are the strength and volume characteristics of generalized solid-phase-media of soil mass and external dynamic loading features. The strength characteristic of the media could be figured by the cohesion and internal friction angle, both obtained expediently through laboratory geotechnical tests, while the volume feature of the media could be described by the void ratio. By the view of the macro physical-mechanical mechanism of seismic subsidence in unsaturated loess, the factors of cohesion and internal friction angle briefly represent the characteristics of soil structure strength, and the factor of void ratio influences the final seismic subsidence magnitude of soil mass. In fact, the strength feature of loess shows the endurance capacity of soil mass to resist the external dynamic loading meanwhile, the subsidence magnitude characteristic of loess describes the settlement capacity of soil mass under the external dynamic loading.关键词
非饱和黄土/广义固相介质/动荷载/震陷/物理力学机制/影响因素Key words
Unsaturated loess/Generalized solid-phase-media/Dynamic loading/Seismic subsidence/Physical-mechanical mechanism/Influence factor分类
建筑与水利引用本文复制引用
孙军杰,王强,王兰民..非饱和黄土震陷物理力学机制与主导影响因素[J].西北地震学报,2011,33(z1):71-76,6.基金项目
中国地震局兰州地震研究所论著编号:LC2011038 （）
