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粒间胶结物的存在改变土体颗粒间接触力的传递方式,因此,显著影响天然结构性土体的宏观力学响应和强度。为了研究粒间胶结的几何尺寸对理想圆形颗粒法向接触力学行为的影响,采用有限元方法模拟了圆形胶结颗粒微观抗压试验,分析了粒间胶结厚度和宽度对粒间法向接触应力分布和抗压强度的影响,并将模拟结果与模型试验进行了对比。结果表明,数值试验所得到的峰前荷载-位移曲线与室内试验结果吻合较好。粒间法向接触应力分布不均,中心大,外缘小。塑性区分布与高应力区不重合,塑性区在胶结物中心和外缘之间产生,逐渐向中心和边缘方向扩展。胶结抗压强度随厚宽比增加而降低,相同厚宽比下抗压强度基本一致。
The existence of intergranular cement changes the transmission of the contact force between soil particles, and therefore significantly affects the macroscopic mechanical response and strength of natural structured soils. In order to study the influence of the size of the intergranular cementing on the normal contact mechanics behavior of ideal circular particles, the microscopic compression test of the circular cement particles was simulated by the finite element method. The effects of intergranular cementing thickness and width on the intergranular normal contact Stress distribution and compressive strength, and the simulation results are compared with the model test. The results show that the pre-peak load-displacement curves obtained by numerical experiments agree well with the laboratory tests. Intergranular normal contact stress distribution is uneven, the center is big, the outer margin is small. The distribution of plastic zone does not coincide with that of high stress zone. The plastic zone is produced between the center of cement and the outer edge, and gradually expands to the center and edge. The compressive strength of cement decreases with the increase of aspect ratio, and the compressive strength of the same aspect ratio is basically the same.