【作者】 苏微倩；

【导师】 程康；

【作者基本信息】 武汉理工大学 ， 岩土工程， 2012， 硕士

【摘要】 论文分析了国内外预裂爆破空气间隔装药技术的研究现状,并提出了在山区公路修建中使用该技术的必要性和迫切性。通过理论分析、数值模拟和现场测试确定了预裂爆破空气间隔装药技术的可靠性和实用性,并总结出其相对于传统装药技术的优越性。在理论分析的基础上,数值建模研究了空气间隔装药预裂爆破中最佳纵向不耦合系数。同时,将数值模拟结果用于了工程实际现场测试。主要内容如下：(1)对岩石爆破机理、岩石爆破理论模型(弹性理论模型、断裂理论模型、爆破损伤模型)以及爆破损伤变量进行了详细阐述,为本文研究提供理论支持。(2)在爆破理论的支持下,利用ANSYS10.0/LS-DYNA程序进行有限元分析。在不同孔间距及装药长度情况下,进行纵向不耦合装药预裂爆破的数值模拟,得出最佳纵向不耦合系数范围。(3)将模拟结论应用在工程实际中进行现场测试,观察其预裂爆破的效果,整理出具有应用价值的预裂爆破技术。通过上述工作的进行,得出如下结论：对于Ⅲ类灰岩,在孔深12m(有效炮孔深度为10m)时,预裂爆破的最佳距离为0.8m、0.9m和1.0m,但是其相应的装药长度不尽相同,即两孔间距为0.8m时,空气间隔装药长度为2.2m,即纵向不耦合系数K=4.54可以得到良好的爆破效果；对于间距0.9～1.0m时,空气间隔装药长度为2.75～3.3m,即纵向不耦合系数在3.03～3.64范围内可取的良好的爆破效果。更多还原

【Abstract】 This paper analyzes the domestic and international research of presplit blasting Air-deck Charge technology, and put forward the necessity and urgency of using this technology in the highway construction which through the mountains. We figure out the reliability and practicability of presplit blasting Air-deck Charge technology through the research method of theoretical analysis, field experiment, numerical simulation and so on. And compare it to conventional charge technology to sum up its superiority. After the theoretical analysis, the numerical modeling determined the best lengthways decoupling coefficient of the presplit blasting Air-deck Charge. In the meanwhile, to fed the numerical mocking back to the engineering practice. Its main points are as follows:(1) Elaborated on the mechanism and theoretical model (elasticity-theory model, fracture-theory model,blasting-damage model) of rock-blasting and the damage variable of blasting.Providing theoretical support for this study.(2) Based on the support of the theory of blasting, using ANSYS10.0/LS-DYNA program for finite element analysis. Taking the numerical modeling of longitudinal coupling charge presplit blasting in the case of different pitch of holes and charging length. Then finding out the best range of lengthways decoupling coefficient.(3)Using the conclusion of numerical modeling in engineering practice for spot text, to observe the effect of presplit blasting and sort out a valuable technology of presplit blasting.By the above-mentioned work, we have these conclusions:to class-3limestone, when the depth of blast hole is12meters(effective depth of blast hole is10meters), the best pitch of holes is0.8meters,0.9meters and1.0meters, but they have different charging length. When pitch of holes is0.8meters, the charging length is2.2meters, lengthways decoupling coefficient is4.54,it can get better effect of presplit blasting; When pitch of holes is0.9-1.0meters, the charging length is2.75-3.3meters,lengthways decoupling coefficient is3.03-3.64,it can get better effect of presplit blasting.更多还原