softening region meaning in English

软化区域

The computation results show that after reinforcing the soft and weak floor , the deformation of the surrounding rock of sides gets smaller , especially , that in the lower part of the sides decreases to a larger extent ; the size of plastic zones and the scope of strength - softening region in surrounding rock of sides become smaller ; the area that has an increase in the maximal principal stress in surrounding rock of sides shrinks , and the zones of peak - value of maximal principal stress approach the periphery of roadway
计算结果表明，加固软弱底板后巷道两帮围岩变形量减小，尤其是巷道两帮下部围岩变形量减小幅度较大，两帮围岩塑性区范围和软化区范围缩小，两帮围岩主应力升高区范围缩小，主应力峰值区域更加靠近巷道周边。