孔隙空间分布对粗粒土强度变形特性影响研究

为了深入认识粗粒土的强度变形机理，以孔隙结构的不均匀性为研究对象，通过分析孔隙的数量变异性、体积变异性和偏聚效应，定义了可以定量刻画粗粒土孔隙空间变异性的孔隙空间分布系数。并利用PFC3D和Abaqus软件进行了粗粒土的数值模拟三轴试验，结果表明：在其他条件不变时，随着孔隙空间分布系数增大46.8%，粗粒土的弹性模量、峰值强度和泊松比均呈指数函数形式分别减小40.8%，12.5%，39.5%，影响十分显著。

Influence of Pore Space Distribution on Strength and Deformation Characteristics of Coarse-Grained Soil

The macro strength and deformation characteristics of coarse-grained soil are closely related to its micro pore structure. In order to deeply understand the strength deformation mechanism of coarse-grained soil, this paper takes the heterogeneity of pore structure as the research object, and defines the pore space distribution coefficient which can quantitatively describe the pore space variability of coarse-grained soil by analyzing the quantitative variability, volume variability and segregation effect of pores. The results show that the elastic modulus, peak strength and Poisson''s ratio of coarse-grained soil decrease by 40.8%, 12.5% and 39.5% respectively with the increase of pore space distribution coefficient under other conditions.