This study examines the influence of particle shape irregularity and elongation on the shear behaviors of granular materials using the 3D discrete element method (DEM). The particles are generated by combining a Fourier shape descriptor-based method with the random field theory and reconstructed in DEM using the overlapping sphere algorithm. A series of drained and undrained triaxial and true triaxial tests are performed to shear the samples with different particle irregularity and elongation to the critical state. The stress and the strain responses, the evolution of the fabric anisotropy and the coordination number are examined and analyzed within the framework of the anisotropic critical state theory. It is found that the consideration of complex shaped particles in DEM produces more realistic sand behaviors, and the shear strength and the dilation of the granular material increase with increasing irregularity and elongation. While elongation in the range of the study has insignificant influence on the location of the critical state line (CSL) on the void ratio-mean effective stress plane, irregularity is found to positively affect both the absolute slope and the intercept of the CSL. The unique fabric anisotropy norm at the critical state is also sensitive to the particle shape and is greater with larger irregularity and elongation.

这项研究使用3D离散元方法（DEM）研究了颗粒形状不规则性和伸长率对粒状材料剪切行为的影响。通过将基于傅立叶形状描述符的方法与随机场理论相结合来生成粒子，并使用重叠球体算法在DEM中对其进行重构。进行了一系列排水和不排水的三轴和真三轴试验，以剪切具有不同颗粒不规则度和伸长率的样品至临界状态。在各向异性临界状态理论的框架内，对应力和应变响应，织物各向异性的演变以及配位数进行了分析。发现在DEM中考虑复杂形状的颗粒会产生更逼真的砂性，随着不规则度和伸长率的增加，颗粒材料的剪切强度和膨胀性增加。尽管研究范围内的伸长率对临界状态线（CSL）在空隙比-有效应力平面上的位置影响不显着，但发现不规则性对CSL的绝对斜率和截距都产生了积极影响。临界状态下独特的织物各向异性范数也对颗粒形状敏感，并且在具有较大的不规则性和伸长率时会更大。发现不规则性对CSL的绝对斜率和截距均产生积极影响。临界状态下独特的织物各向异性范数也对颗粒形状敏感，并且在具有较大的不规则性和伸长率时会更大。发现不规则性对CSL的绝对斜率和截距都产生了积极影响。临界状态下独特的织物各向异性范数也对粒子形状敏感，并且在具有较大的不规则性和伸长率时会更大。