冻结砂土力学性质的离散元模拟  

Simulation of mechanical behavior for frozen sand clay by discrete element method

作　　者：周凤玺[1,2] 赖远明[1] 

机构地区：[1]中国科学院寒区旱区环境与工程研究所冻土工程国家重点实验室,兰州730000 [2]兰州理工大学土木工程学院,兰州730050

出　　处：《岩土力学》2010年第12期4016-4020,共5页Rock and Soil Mechanics

基　　金：国家863计划项目(No.2008AA11Z103);中国科学院西部计划项目(No.KZCX2-XB2-10);国家自然科学基金(No.40730736);冻土工程重点实验室基金(No.SKLFSE-ZY-03)

摘　　要：基于离散单元法颗粒流理论,土体颗粒单元间采用接触黏结模型中来考虑冻土中冰的胶结作用,建立了冻结砂土的颗粒流模型。通过改变计算模型中颗粒单元的参数,模拟了在不同冻结温度以及不同围压下冻结砂土的宏观力学性质,并与冻结砂土的室内试验结果进行了比较,结果表明:颗粒流方法可以较好地模拟冻结砂土的应力-应变关系以及剪切带的发展变化过程,颗粒流细观参数对温度具有显著的依赖性。研究结果对离散单元法在特殊土中的应用具有一定的理论和应用价值。Based on the discrete element method （DEM）, the model of particle flow for frozen sand clay has been established, the contact-bond model among balls is adopted in the simulation test. According to this model, the contact bond strength was employed to simulate the cementation of ice in the frozen sand clay. Comparison between the results of numerical simulations and laboratory tests under different temperature and confining pressure, the results shows good agreement between them. It is similar to the macro properties of frozen sand clay that the parameters of particle elements have the property of evident temperature-dependent. The results are valuable for developing the applicability of the DEM to analysis of special soil.

关 键 词：离散单元法 冻结砂土 应力-应变关系 剪切带 

分 类 号：TU441[建筑科学—岩土工程]