采用 FLAC-3 D模拟了应变软化岩土材料局部化剪切带的发展、扩容对剪切带倾角的影响及试件的宽度效应。随着加载时步的增加 ,彼此孤立的两个应变场逐渐靠近、叠加 ,最终形成了剪切带网络。无论端面约束强或弱 ,剪切带的倾角的数值模拟结果都与罗斯科倾角比较接近。增加试样宽度 ,剪切带的宽度增加 ,剪切带变得不平直 ;宽度越大 ,岩样上端面中点的压应力 -加载时步曲线的峰值强度越大 ,宽度对弹性阶段没有大的影响 FLAC-3 D is used to simulate the influence of the development of localized shear zone of strain-softened geomaterials on the dip angle of shear zone and the width effect of specimens. With the increase of loading time, the two isolated strain fields gradually come close to each other and form a shear band network. No matter whether the confinement is strong or weak, the numerical simulation results of the inclination of the shear zone are close to that of the Roscoff. Increasing the width of the specimen increases the width of the shear band and the shear band becomes uneven. The greater the width, the greater the peak stress at the midpoint of the rock specimen at the midpoint of loading, Big impact