發(fā)布時間：2018-11-07 08:20

【摘要】：應用ABAQUS擴展有限元(XFEM)模擬了切槽炮孔定向斷裂爆破時爆生裂紋沿切槽方向和非切槽方向的起裂、擴展和止裂。結果表明:切槽方向爆生裂紋的起裂時間比非切槽方向早10μs;裂紋擴展速度較非切槽方向具有明顯的階段性,可分為加速擴展、失穩(wěn)擴展和減速擴展3個階段;裂紋的止裂時間比非切槽方向晚60μs。在裂紋擴展階段,切槽方向在失穩(wěn)擴展階段爆生裂紋的平均速度為1343 m/s,非切槽方向爆生裂紋的平均速度為600 m/s,僅為切槽方向爆生裂紋平均速度的44%,說明切槽有利于爆炸能量釋放,增加爆生裂紋的擴展速度。切槽方向和非切槽方向爆生裂紋擴展的平均距離分別為124 mm和45 mm,說明切槽對爆生裂紋的擴展有明顯的導向作用。XFEM能夠正確模擬切槽爆破爆生裂紋的擴展,具有廣闊的應用前景。
[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.
【作者單位】： 中國礦業(yè)大學(北京)力學與建筑工程學院;
【基金】：國家自然科學基金項目(51374212,51134025) 國家大學生創(chuàng)新訓練項目
【分類號】：O346.1

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