H-V加筋土性状的颗粒流细观模拟

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。

Behaviour of soil reinforced with H-V inclusions by PFC2D

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 numerical simulation of PFC2D,the occurrence and propagation of shear band were studied and some useful conclusions were drawn.