晶体及矿物颗粒大小对岩土材料力学性质的影响

岩石常见较大的晶体或者矿物颗粒，混凝土中是骨料，通过团簇模拟大颗粒的力学行为、团簇可以破裂。根据设计的相同数量、相同位置、不同半径的大颗粒数值单轴压缩试验，在虚拟试验条件下，考察了颗粒大小对材料力学响应的影响。通过分析颗粒材料的破裂形态、裂纹扩展过程、应力-应变曲线和破裂能量演化规律发现：大颗粒具有明显的增强特性，有阻止裂纹扩展的作用，破裂多绕大颗粒发展；增强幅度随颗粒半径的增加呈单增趋势，半径较小时，增强效果不明显。

Mechanical characteristics of rock and soil affected by particle size of crystal and mineral

Big size of particle such as crystal, mineral or aggregate is often seen in rock or concrete material. The mechanical behavior of these particles with big size crystal is simulated by clump, which can break during the loading process. According to the designed numerical uniaxial compression test of particle material with same number of particle, same spatial location and different radii of clump, the material’s mechanical response affected by these different sizes of crystals, minerals or aggregates is observed by means of rupture shape, fracture propagation, curve of stress and strain and energy dissipation process during the breakage of particle material under virtual experimental condition. It is found that big size particle does favor to material feature’s enhancement, can stop the expansion of crack and makes cracks produced around the clump, and that the enhancing degree is proportional to the clump radius.