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为研究胶结厚度和边界条件对胶结颗粒抗压特性的影响,利用离散元数值方法模拟了胶结颗粒的室内微观压缩试验,并与室内试验结果进行了对比。结果表明,胶结厚度对胶结颗粒抗压强度影响较大,抗压强度随胶结厚度的增加呈指数形式下降并趋近恒定值,这一现象与室内试验结果吻合较好。而胶结厚度的影响程度与边界约束有关,当边界约束较强时微观剪切破坏占主导,抗压强度较高。另外,边界形状对微观胶结破坏模式(拉伸破坏或剪切破坏)有一定影响,平面边界由于边界约束效应更强,导致胶结颗粒的抗压强度更高。
In order to study the influence of bonding thickness and boundary conditions on the compressive properties of cementitious particles, a discrete element numerical method was used to simulate the microcosmic compression tests of cement particles. The results were compared with those of laboratory tests. The results show that the cemented thickness has a great influence on the compressive strength of the cemented particles. The compressive strength decreases exponentially with the increase of the cemented thickness and approaches a constant value. This phenomenon is in good agreement with the laboratory test results. The effect of cementation thickness is related to the boundary constraints. When the boundary constraints are strong, the micro-shear failure is dominant and the compressive strength is higher. In addition, the boundary shape has some influence on the micro-cementation failure mode (tensile failure or shear failure), and the boundary constraint effect of the plane boundary is stronger, resulting in the higher compressive strength of the cemented particles.