基于XFEM的切槽炮孔定向断裂爆破数值模拟

发布时间：2018-11-07 08:20

【摘要】：应用ABAQUS扩展有限元(XFEM)模拟了切槽炮孔定向断裂爆破时爆生裂纹沿切槽方向和非切槽方向的起裂、扩展和止裂。结果表明:切槽方向爆生裂纹的起裂时间比非切槽方向早10μs;裂纹扩展速度较非切槽方向具有明显的阶段性,可分为加速扩展、失稳扩展和减速扩展3个阶段;裂纹的止裂时间比非切槽方向晚60μs。在裂纹扩展阶段,切槽方向在失稳扩展阶段爆生裂纹的平均速度为1343 m/s,非切槽方向爆生裂纹的平均速度为600 m/s,仅为切槽方向爆生裂纹平均速度的44%,说明切槽有利于爆炸能量释放,增加爆生裂纹的扩展速度。切槽方向和非切槽方向爆生裂纹扩展的平均距离分别为124 mm和45 mm,说明切槽对爆生裂纹的扩展有明显的导向作用。XFEM能够正确模拟切槽爆破爆生裂纹的扩展,具有广阔的应用前景。
[Abstract]:ABAQUS extended finite element method (XFEM) is used to simulate the initiation, propagation and crack arrest of explosive crack along the direction of notch and non-notch during directional fracture blasting. The results show that the crack initiation time in the tangential direction is 10 渭 s earlier than that in the non-tangent direction, and the crack growth speed is obviously phased compared with the non-tangent direction, which can be divided into three stages: accelerated growth, unstable propagation and decelerating propagation. The crack arrest time is 60 渭 s later than that in the non-notch direction. At the stage of crack growth, the average velocity of explosive crack in tangent direction is 1343 m / s, and that in non-tangent direction is 600m / s, which is only 44% of the average velocity of crack in tangent direction. The results show that notch cutting is beneficial to the release of explosive energy and increases the propagation speed of explosive crack. The average distance of crack propagation in notch direction and non-notch direction is 124 mm and 45 mm, respectively. The results show that the notch has an obvious guiding effect on the propagation of explosive crack. XFEM can correctly simulate the propagation of explosive crack in notched blasting. It has broad application prospect.
【作者单位】：中国矿业大学(北京)力学与建筑工程学院;
【基金】：国家自然科学基金项目(51374212,51134025) 国家大学生创新训练项目
【分类号】：O346.1

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