为了进一步分析土工格室在土体中的加筋作用, 以高强土工格室作为研究对象, 采用室内 3 轴试验和颗粒流模拟的方法, 研究土工格室加筋砂土的特性, 并通过 3 维颗粒流分析程序 (three dimension particle flow code, PFC$^{3\rm D}$) 模拟加筋砂土在不同工况下的应力-应变特性、接触力分布情况、位 移场分布规律等. 结果表明, 用 PFC$^{3\rm D}$ 能够较好地模拟加筋砂土的应力-应变特性; 随着土工格室焊距的增大, 加筋砂土模型的承载力也增大; 土工格室的高度越高, 加筋砂土的承载力越大; 随着围压的升高加筋砂土的承载力也增大. 最后, 分析了在荷载作用下的加筋砂土的位移情况, 得出在土工格室中间及其影响区域内土体颗粒在位移方向排列比较集中和整齐, 且土体颗粒基本上沿着主应力方向, 在土工格室影响区域外围向外扩散.

To analyze the effect of geocell in soil reinforcement, this paper studies high strength geocell. Characteristics of soil reinforced with geocell under different conditions are investigated by indoor triaxial tests using particle flow software. Three dimension particle flow code (PFC$^{3\rm D}$) is used to simulate reinforced stress-strain characteristics of sandy soil under different conditions, the contact force distribution, and distribution regularity of the displacement field. The results show that PFC$^{3\rm D}$ can better simulate characteristics of stress-strain of reinforced sand. With the increase of the welding of geocell, the model of reinforced soil bearing capacity increases. The higher the geocell, the higher the bearing capacity of the reinforced soil. With the increase of confining pressure, bearing capacity of the reinforced sand increases. Displacements of the reinforced sand under load are then analyzed. The results show that the displacement direction of the soil particles in the geocell and its influence area are more concentrated and neater. It is basically along the principal stress direction, spreading outward in the geocell impact area outside the soil particles.