The stress level in elastic zone and the stress distribution in strain-softeningzone are not affected by the pillar thickness. The former is related to the axial strain of the pillar.
矿柱弹性区的应力水平及软化区的应力分布不受矿柱宽度的影响，前者与矿柱的轴向应变有关。
2
The relation between the softening factor of the destressed zone and borehole spacing and row spacing is a hyperbolic curve.
软化卸压带的软化系数与炮眼间距及排距呈双曲线关系。
3
There is a fracture process zone near the crack tip for the tensile strain softening materials.