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本文提出了炮孔中非对称爆炸载荷(如极限偏心装药和特殊药卷)产生的“非对称效应”,分析了这种非对称载荷对无限岩体中炮孔周围裂隙的生成,扩展和最终分布的影响。研究得出:在偏心装药时,在装药与炮孔壁接触面上首先生成裂隙,预先生成的裂隙引起的稀疏波对孔壁上其它方向上的裂纹的生成与扩展有限制作用,这一制约遵循下列必要条件: 根据J一积分原理导出了计算裂隙产生所需时间的理论公式,计算结果与动光弹试验结果基本吻合。 最后,分析了切缝药包爆炸产生非对称载荷的机理,介绍了这项新技术在断裂控制中的应用效果。 本文所提出的关于炮孔爆破中新的岩体断裂理论以及所得出的初步结论对于爆破破岩机理的研究和指导工程实践都具有重要意义。
This paper presents the “asymmetric effect” of asymmetric explosion loads (such as extreme eccentric charge and special drug roll) in blast holes, and analyzes the formation and propagation of such asymmetrical loads on the cracks around the blasting holes in an infinite rock mass. The impact of the final distribution. The results show that when the eccentric charge is applied, a crack is firstly formed on the contact surface between the charge and the hole wall of the blasting wall. The pre-generated crack caused by the crack has a limiting effect on the crack growth and propagation in other directions on the hole wall, A constraint follows the following prerequisites: According to the J-integral principle, a theoretical formula for calculating the time required to generate a crack is derived. The calculated results are in good agreement with the results of the dynamic photoelastic test. Finally, the mechanism of asymmetric load caused by explosion of kerf package was analyzed. The application of this new technology in fracture control was introduced. The new theory of rock mass fracture in blasting blasting proposed by this paper and the preliminary conclusions obtained are of great significance to the study of blasting rock breaking mechanism and engineering practice.