冲击破岩时破碎区扩展规律数值模拟

来源期刊：中南大学学报(自然科学版)1998年第5期

论文作者：段乐珍 徐国元 朱成忠

文章页码：20 - 23

关键词：数值模拟;破碎区;楔形钎刃;冲击破岩

Key words：numerical simulation; fracture area; wedged bit; rock fracture in dynamic indentation

摘    要：针对动载定侵深破岩条件建立计算模型，应用动力有限元法，对楔形钎刃冲击破岩时破碎区扩展过程进行了研究．模拟结果表明：破碎区是随冲击载荷的增大自刃尖下方沿刃面方向向自由面扩展而形成的，且破碎角20≈116°．这结果与实验结果基本吻合，证明用数值模拟方法研究冲击破岩问题是可行的.

Abstract: In the paper, the authors established a calculating model aiming at a given penetration depth of a wedged bit under dynamic loading,and investigated into the development of the fracture area by means of dynamic finite element method.The results showed that the fracture area was developed from rock beneath the tip of bit toward rock adjacent to the free surface along the bit′s face with the growth of load,and the fracture angle(2θ) was approximately equal to 116°.The results approximately coincided with the experimental results of the developing process of the fracture area,and proved that it was possible to investigate into the problem of rock fracture under impact loading using numerical simulation.