H_V加筋土性状的颗粒流细观模拟.pdfVIP

第30卷 第5期 岩 土 工 程 学 报 Vol.30 No.5 2008年 5月 Chinese Journal of Geotechnical Engineering May, 2008 H-V 加筋土性状的颗粒流细观模拟 张孟喜，张石磊 (上海大学土木工程系，上海 200072) 摘 要：正交水平－竖向（H-V ）加筋是一种新型的土工加筋技术，在 H-V 加筋土中除了有传统的水平筋条外，还在 水平筋条上设置了竖向齿筋。结合已完成的加筋土三轴试验，采用基于离散元理论的颗粒流软件（PFC2D ）对试验进行 了仿真模拟，较好地拟合了H-V 加筋砂土三轴试验的应力–应变曲线，并通过观测颗粒的受力情况分析了 H-V 加筋砂 土的受力机理。通过引入颗粒流理论，对 H-V 加筋砂土试样的剪切带形成进行了细观数值模拟，揭示了 H-V 加筋土中 剪切带产生、扩展的渐进破坏规律。 关键词：H-V 加筋；三轴试验；颗粒流；离散元；剪切带 中图分类号：TU472.34 文献标识码：A 文章编号：1000 –4548(2008)05 –0625 –07 作者简介：张孟喜 – ，男，山西万荣人，教授，博士后，博士生导师，主要从事新型土工加筋技术及环境岩土 (1963 ) 工程研究。E-mail: mxzhang@staff.shu.edu.cn 。 2D Behaviour of soil reinforced with H-V inclusions by PFC ZHANG Meng-xi, ZHANG Shi-lei (Dept. of Civil Engineering, Shanghai University, Shanghai 200072, China) Abstract: Soil reinforced with horizontal-vertical (H-V) inclusions orthogonally is a new concept of reinforced soil. In the H-V reinforced soil, besides the conventional horizontal inclusions, vertical reinforced elements are also placed on the horizontal ones. A series of laboratory triaxial compression tests on sand specimens reinforced with H-V orthogonal inclusions were carried out. Particle flow code (PFC), based on the discrete element method (DEM), was introduced to simulate the triaxial tests. The macro stress-strain relation of the sand specimens reinforced with H-V inclusions was reproduced and verified by PFC2D model, and the fundamental mechanism was also analyzed. From the