ESTABLISHEMENT AND ANALYSIS OF ELASTO-PLASTIC LOESS MICROSTRUCTURE AND DYNAMIC DEFORMATION MODEL
DENG Jin1，2，3，WANG Lanmin2，WU Zhijian1，2，3
(1. Key Laboratory of Loess Earthquake Engineering，China Earthquake Administration，Lanzhou，Gansu 730000，China；2. Lanzhou Institute of Seismology，China Earthquake Administration，Lanzhou，Gansu 730000，China；3. Geotechnical Disaster Prevention Engineering Technology Research Center of Gansu Province，Lanzhou，Gansu 730000，China)
Abstract：Analysis of dynamic properties of loess from microstructure perspective is one of the most important direction to explore loess constitutive model. According to the micromechanism that overhead pore is the dynamic factors causing the residual deformation of elasto-plastic loess，combined with air-solid surface theory and hyperbolic formula，the pore-overhead seismic subsidence models is established by using data such as dynamic triaxial test parameters，overhead pore area and confining pressure. Computational formula for residual deformation coefficient of loess under dynamic loading is acquired in the model. By test contrast of the main loess deposition samples，the residual deformation coefficient calculated by the computational formula is very closed to the experimental value. The comprehensive analysis results show that the one-dimensional micro-pore dynamic residual model can well reflect the residual deformation actual situation induced by loess microstructure difference under different confining pressures，water contents and dry densities. The model can generally reflect the characteristics of elasto-plastic deformation of loess.
苗天德，刘忠玉，任九生. 湿陷性黄土的变形机制与本构关系[J]. 岩土工程学报，21(4)：383-387.(MIAO Tiande，LIU Zhongyu，REN Jiusheng. Deformation mechanism and constitutive relation of collapsible loess[J].Chinese Journal of Geotechnical Engineering，1999，21(4)：383-387.(in Chinese))
[2]
周凤玺，米海珍，胡燕妮.基于广义塑性力学的黄土湿陷变形本构关系[J].岩土力学，2005，26(11)：1823-1828.(ZHOU Fengxi，MI Haizhen，HU Yanni. An constitutive relation for collapsible deformation of loess based on generalized plasticity[J].Rock and Soil Mechanics，2005，26(11)：1823-1828.(in Chinese))
[3]
庄海洋，陈国兴，朱定华.土体动力黏塑性记忆型嵌套面本构模型及其验证[J].岩土工程学报，2006，28(10)：1267-1272.(ZHUANG Haiyang，CHEN Guoxing，ZHU Dinghua.Dynamic visco-plastic memorial nested yield surface model of soil and itsverification[J]. Chinese Journal of Geotechnical Engineering，2006，28(10)：1267- 1272.(in Chinese))
[4]
李宏儒，胡再强，陈存礼，等.基于物态本构模型的土体动力反应分析方法[J].岩土工程学报，2008，30(4)：503-510.(LI Hongru，HU Zaiqiang，CHEN Cunli，et al. Approach of soil dynamic response analysis based on physical state constitutive relationship[J].Chinese Journal of Geotechnical Engineering，2008，30(4)：503-510.(in Chinese))
[5]
李小军.土的动力本构关系的一种简单函数表达式[J].岩土工程学报，1992，14(5)：90-94.(LI Xiaojun. A simple function expression for dynamic constitutive relationship of soil[J]. Chinese Journal of Geotechnical Engineering，1992，14(5)：90-94.(in Chinese)).
[6]
张茂花，谢永利，刘保健.基于割线模量法的黄土增湿变形本构关系研究[J].岩石力学与工程学报，2006，25(3)：609-617.(ZHANG Maohua，XIE Yongli，LIU Baojian. Study on constitutive relation of loess moistening deformation based on secant-modulus method[J]. Chinese Journal of Rock Mechanics and Engineering，2006，25(3)：609-617.(in Chinese))
[7]
谢定义，齐吉琳.土结构性及其定量化参数研究的新途径[J].岩土工程学报，1999，21(6)：651-656.(XIE Dingyi，QiJilin. Soil structurecharacteristics and new approach in research on its quantitativeparameter[J]. Chinese Journal of Geotechnical Engineering，1999，21(6)：651-656.(in Chinese))
[8]
陈存礼，何军芳，杨鹏.考虑结构性影响的原状黄土本构关系[J].岩土力学，2007，28(11)：2284-2290.(CHEN Cunli，HE Junfang，YANG Peng. Constitutive relationship of intact loess considering structural effect[J]. Rock and Soil Mechanics，2007，28(11)：2284- 2290.(in Chinese))
[9]
谢定义.中国土动力学的发展现状与存在的问题[J].西北地震学报，2007，29(1)：94-95.(XIE Dingyi. Developing situation and problem of soil dynamicsin China[J]. Northwestern Seismological Journal，2007，29(1)：94-95.(in Chinese))
[10]
DENG J，WANG LM，ZHANG ZZ. The loess Microstructure characteristics and forming environment of late Quaternary period in the loess plateau of China[J]. Environmental Earth Sciences，2010，59(8)：1807-1817.
[11]
邓 津，王兰民，张振中. 黄土显微结构特征与震陷性[J].岩土工程学报，2007，29(4)：542-548.(DENG Jin，WANG Lanmin，ZHANGZhenzhong. Microstructure characteristics and seismic subsidence of loess[J]. Chinese Journal of Geotechnical Engineering，2007，29(4)：542-548.(in Chinese))
谢定义.原状黄土动力特性的初步研究[M].北京：科学出版社，1998：60-100.(XIE Dingyi. Preliminary research on dynamic characteristics of the undisturbed loess[M]. Beijing：Science Press，1998：60-100.(in Chinese))
[14]
张权义，彭政，何润，等.运动物体在颗粒介质中的阻力形式[J].物理学报，2007，58(8)：4708-4712.(ZHANG Quanyi，PENG Zheng，HE Run，et al. The drag force experienced by a projectile in granular medium under gravity[J].Acta Physica Sinica，2007，58(8)：4708-4712.(in Chinese))
[15]
张春晔.物理化学[M].南京：南京大学出版社，1996：50-100.(ZHANG Chunye. Physical chemistry[M]. Nanjing：Nanjing University Press，1996：50-100.(in Chinese))
[16]
王兰民，邓津，黄媛.黄土震陷性的微观结构量化分析[J].岩石力学与工程学报，2007，26(增1)：3025-3031.(WANG Lanmin，DENG Jin，HAUNG Yuan. Quantitative analysis of microstructure of loess seismic subsidence[J]. ChineseJournal of Rock Mechanics and Engineering，2007，26(Supp.1)：3025-3031.(in Chinese))
2013, Vol. 32 
