黄土震陷性的微观结构量化分析  

QUANTITATIVE ANALYSIS OF MICROSTRUCTURE OF LOESS SEISMIC SUBSIDENCE

作　　者：王兰民[1] 邓津[1] 黄媛[2] 

机构地区：[1]中国地震局兰州地震研究所 [2]中国地震局地球物理研究所,北京100081

出　　处：《岩石力学与工程学报》2007年第A01期3025-3031,共7页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家自然科学基金资助项目(50379049)

摘　　要：基于数字扫描电镜获得的微观架空孔隙面积量化数据,结合相关原理,建立黄土震陷系数计算公式。通过对兰州、西安等地黄土的动三轴试验、微结构扫描电镜测试、试验与计算震陷系数的对比分析,论证对该公式所用主要参数——架空孔隙面积通过量化处理获取的可行性和公式的合理性与适用范围;通过对基于微观架空孔隙面积量化数据的黄土震陷系数计算公式的数学分析,提出黄土震陷过程中应力–应变发展的5个阶段,并从微观结构给出相应的物理解释,即认为黄土震陷是由于不同大小的架空孔隙不断破坏而导致的多个突变过程的最终宏观结果。A formula has been already developed to estimate seismic subsidence coefficient based on the area of micro-trellis pores measured by EMS and relative theories.The probability to obtain the main parameters used in the formula by measuring the area of trellis pores,reasonability and usable conditions of the formula are discussed.Furthermore,through a mathematical analysis,five stages in the development of stress and strain during seismic subsidence of loess are recognized,which gives a physical explanation for seismic subsidence of loess in terms of its microstructure,i.e,it is a final macro result accumulated by several processes of sudden changes caused by the ceaseless damage and destruction of trellis pores with different sizes.

关 键 词：土力学 震陷系数 架空孔隙面积 量化分析 微观结构 

分 类 号：TU444[建筑科学—岩土工程]