岩土力学2012，Vol.33Issue(5)：1293-1299,7.
水泥胶结颗粒的微观力学模型试验
Experimental investigation on micromechanical model of cement-bonded particles
摘要
Abstract
Bond between particles has become one of the key factors in establishing the constitutive model of natural sands. In this paper, the bonded granulates are idealized by two aluminum rods glued together by cement with cement water ratio 0.34, and the micromechanical responses of the bonded rods are investigated by performing a series of loading tests, such as tension tests, compression tests, shear tests, rotation tests and complex stress path tests. Then the comparison between the present results and the experimental data acquired on the epoxy resin adhesive by Jiang et al., is carried out to analyze the effect of bonding materials. The results show that the mechanical behaviors of cement and epoxy resin bonded rods both satisfy the same micro-contact laws proposed by Jiang et al. in spite of some distinct differences between the two kinds of bond materials. The tension and compression strengths of cement are lower while the ductility is better than those of epoxy resin. Both cement and epoxy resin bonded rods present plastic-softening property in compression tests. In the shear and torsion tests, shearing force and torque initially increase with the normal force until a critical normal force is reached, and then gradually decrease. The strength envelope in the normal-torsion-shear space is a rugby and water-drop shell for the cement and epoxy resin adhesive, respectively.关键词
水泥胶结/离散单元法/胶结模型/微观胶结试验Key words
cement bond/ discrete element method (DEM)/ bond contact model/ micro-bond mechanical test分类
建筑与水利引用本文复制引用
蒋明镜,肖俞,孙渝刚,吴晓峰..水泥胶结颗粒的微观力学模型试验[J].岩土力学,2012,33(5):1293-1299,7.基金项目
国家杰出青年基金(No.51025932) （No.51025932）
国家重点基础研究发展计划(973计划)资助项目(No.2011CB013500) （973计划）
国家自然科学基金(No.10972158) （No.10972158）
长江学者和创新团队发展计划资助项目(No.IRT1029). （No.IRT1029）
