切缝药包定向断裂控制爆破能充分利用炸药的爆炸能量，有效改善爆炸能量的作用方向。目前，对于切缝药包控制爆破的研究，往往假设岩石超出弹性状态即发生破坏，建立的模型偏于简单，而针对其裂缝形成的弹塑性研究分析尚不多见。 本课题从切缝药包控制爆破初始裂缝形成的机理出发，基于弹塑性理论，运用数值模拟方法分析切缝药包控制爆破初始裂缝的形成过程，具体研究内容及成果如下： (1)分析了切缝药包控制爆破的基本原理，基于弹塑性理论对切缝药包控制爆破初始裂缝的形成进行研究，提出初始裂缝扩展的条件。通过弹塑性理论的分析，在J积分主导和J积分控制裂缝扩展条件下，J积分可以作为裂缝尖端场强度的唯一度量，适合切缝药包控制爆破初始裂缝形成的计算。 (2)利用数值模拟软件建立切缝药包控制爆破的二维和三维模型，对影响切缝药包控制爆破效果的几个因素进行了研究。分析表明，过大和过小的不耦合系数都较难达到实现定向断裂爆破的目的。当不耦合系数适度时，在切缝尖端处，有效地形成较强的能流集中现象，能够形成较长的裂缝，实现定向断裂爆破的目的。在装药不耦合系数，炮孔直径以及切缝管材料一定的前提下，理论上存在最优的切缝宽度值，使得切缝药包定向控制爆破的效果达到最好。 (3)在弹塑性条件下，本课题对爆破孔装药参数包括单孔装药量、线装药密度、最小抵抗线等的设计进行介绍，最后建立双孔切缝药包控制爆破数值模型。模拟结果表明，在合理的装药结构下炮孔间距能够得以扩大，从而使得炮孔间裂缝形成贯通，形成光滑壁面。

The technology of controlled blasting in cutting seam cartridge make full use of the energy of explosion by explosive, effectively improve direction of explosion energy. At present, we usually assue that the rock damage directly in the elastic state and simple model on the study of controlled blasting in cutting seam cartridge. It’s still rare to study the process of controlled blasting in cutting seam cartridge useing the elastic-plastic theory. From the formation mechanism to the initiation of cracks which are caused by the technology of controlled blasting in cutting seam cartridge, this topic use the method of numerical simulation study the initiation of cracks. The finally results are as follows: (1) In this paper, we have analyzed the basic principle of controlled blasting in cutting seam cartridge, studied the formation of initial cracks which are based on the elastic and elastic-plastic theory and put forward the initial crack propagation conditions. Through the analysis of elastic-plastic theory, J integral can be used as the only measure of crack tip field strength at the J integral leading and J integral controlling. The J integral is more suitable for the calculation of initial crack formation about controlled blasting in cutting seam cartridge. (2) The numerical simulation software is used to establish 2D and 3D models about the controlled blasting in cutting seam cartridge. In the process, we have studied several factors affecting the controlled blasting in cutting seam cartridge. Analysis shows that it’s more difficult to achieve the goal of realization of directional blasting when the coefficient of not coupling is too large or too small. When we have the suitable coefficient of not coupling, it can effectively form strong flow concentration and a long crack to realize the purpose of orientation fracture blasting. When the coefficient of not coupling, hole diameter and the material of cutting tube are determined, it can achieve the best effect under the optimal cutting seam width values in theory. (3) Under the condition of elastic-plastic, the parameters of blasting hole charge which contains the per blasthole’ charge weight, line density and the minimum resistance line are introduced. Finally it establish the numerical model of controlled blasting in cutting seam cartridge about double orifice. Simulation results show that the hole spacing can be expanded under the reasonable loading structure. Finally it make the cracks through until the rock was broken.