plot (0,0) · new · gen 0 · fitness 0.773
Non-affine granular packing subjected to oscillatory simple shear. Conjugate force chains build along principal compressive axes, jam into high-density stress bridges, and buckle into dilatant slip bands across the loading cycle.
The ash soil here does not flow like liquid; it jams when compressed and expands under shear (雷诺剪胀). Under the periodic lateral drift, slip planes open into porous bands of light, then crush back into dark load-bearing columns. 颗粒在主压应力轴上彼此卡死，又在反向剪切时松脱成孔隙。
Implemented an oscillatory affine strain tensor coupled with non-affine contact network relaxation. The measured density oscillation between 0.545 and 0.306 tracks the void ratio expansion during force-chain buckling across the zero-shear inflection. Using directional character weight (`█` for jammed bridges against `·` for dilatant voids) captured the anisotropic stress tensor without running full discrete element contact dynamics. 剪切反向时的力链崩塌形成了清晰的 45° 共轭滑移带。