单向静载下柱状药包爆破裂纹扩展规律及机制
发布时间：2018-07-28 10:49
【摘要】：将岩体内柱状药包爆破简化为平面应变问题,采用ANSYS/LS-DYNA软件进行数值计算,研究单向静应力对爆破裂纹的影响规律及机制。结果表明:无静应力时,爆破裂纹区形状大致为圆形;而施加单向静应力后,裂纹区形状演化成椭圆形,椭圆的长轴方向与静应力方向相同,且随着静载荷增加,裂纹区长轴基本保持不变,短轴长度降低。这是由于随静载荷变化,沿着加载方向单元的最大主应变基本不变;而垂直加载方向单元的最大主应变随着静载荷增加而减小,从而导致该方向裂纹长度降低。
[Abstract]:The cylindrical charge blasting in rock is simplified as a plane strain problem. The effect of unidirectional static stress on blasting crack and its mechanism are studied by ANSYS/LS-DYNA software. The results show that without static stress, the shape of blasting crack zone is circular, and the shape of crack zone evolves into ellipse after applying unidirectional static stress, and the long axis direction of ellipse is the same as the direction of static stress, and with the increase of static load, the shape of crack zone evolves into ellipse. The long axis of the crack zone remains basically unchanged and the length of the short axis decreases. This is due to the fact that the maximum principal strain of the element along the loading direction is basically unchanged with the change of the static load, while the maximum principal strain of the element in the vertical direction decreases with the increase of the static load, resulting in the decrease of the crack length in this direction.
【作者单位】： 东北大学深部金属矿山安全开采教育部重点实验室;
【基金】：国家重点研发计划项目资助(编号:2016YFC0801605;2016YFC0600706) 国家自然科学基金项目资助(编号:51674061)
【分类号】：TD235
本文编号：2149862
[Abstract]:The cylindrical charge blasting in rock is simplified as a plane strain problem. The effect of unidirectional static stress on blasting crack and its mechanism are studied by ANSYS/LS-DYNA software. The results show that without static stress, the shape of blasting crack zone is circular, and the shape of crack zone evolves into ellipse after applying unidirectional static stress, and the long axis direction of ellipse is the same as the direction of static stress, and with the increase of static load, the shape of crack zone evolves into ellipse. The long axis of the crack zone remains basically unchanged and the length of the short axis decreases. This is due to the fact that the maximum principal strain of the element along the loading direction is basically unchanged with the change of the static load, while the maximum principal strain of the element in the vertical direction decreases with the increase of the static load, resulting in the decrease of the crack length in this direction.
【作者单位】： 东北大学深部金属矿山安全开采教育部重点实验室;
【基金】：国家重点研发计划项目资助(编号:2016YFC0801605;2016YFC0600706) 国家自然科学基金项目资助(编号:51674061)
【分类号】：TD235
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