浅析歪头山铁矿采场爆破降振技术研究

歪头山铁矿采场内破碎站等固定设施稳定运行是生产开拓系统中的重要环节,直接影响到产品产量和运营成本.降低爆破振动,保护固定设施的完好,对歪矿的生产经营及长远发展具有重大意义.文章通过测量和计算,总结出降低歪矿爆破振动的方法,有效的保护了采场内的固定设施.     

复杂环境下土石方控爆技术

结合工程实例，分析了在复杂环境条件下进行土石方爆破的技术特点；介绍了其方案设计和参数选取的方法和原则以及结合实际的施工经验。     

Dynamic Responses Analysis of a Building Structure Subjected to Ground Shock from a Tunnel Explosion

Dynamic responses of a multi-storey building without or with a sliding base-isolation device for ground shock induced by an in-tunnel explosion are numerically analyzed. The effect of an adjacent tunnel in between the building and the explosion tunnel, which affects ground shock propagation, is considered in the analysis. Different modeling methods, such as the eight-node equal-parametric finite element and mass-lumped system, are used to establish the coupling model consisting of the two adjacent tunnels, the surrounding soil medium with the Lysmer viscous boundary condition, and the multi-storey building with or without the sliding base-isolation device. In numerical calculations, a continuous friction model, which is different from the traditional Coulomb friction model, is adopted to improve the computational efficiency and reduce the accumulated errors. Some example analyses are subsequently performed to study the response characteristics of the building and the sliding base-isolation device to ground shock. The effect of the adjacent tunnel in between the building and the explosion tunnel on the ground shock wave propagation is also investigated. T.he final conclusions based on the numerical results will provide some guidance in engineering practice.     

Simplified analysis for reflective overpressure on walls of rectangle-section tunnel due to its inner-explosion

Based on the constructing thought of the displacement model of isoparametric finite element, an extended interpolating algorithm is deduced for calculating the overpressure history of an optional point on the walls of the rectangle-section tunnel under an optional point-explosion in its internal space. According to the working principle, the overpressure histories of all nodes on the walls of a tunnel with the equal width and height of 2 m, induced by a reference-charge explosion at each node in this tunnel's cross section, are computed using the LS-DYNA software, and then are gathered to establish a reference database, which makes it possible to set optionally the positions of the explosive and the overpressure-observed point. In addition, some variation factors of peak values and durations of overpressure on the walls, reflecting some changes on the charge weight and the sizes of width and height of the section, are included in this algorithm in order to simulate approximately the overpressure responses on the walls under the optional charge weight and cross-section size. Some example analyses indicate the rapidity and validity of this method, and therefore this will bring it a good prospect in engineering application.     

高职院校高瓦斯防突区域半煤巷道掘进爆破技术探讨

在煤矿高瓦斯防突区域掘进中,煤与瓦斯突出是发生在煤矿井下一种煤与-瓦斯的突然运动,是一种伴有声响和猛烈力能效应的动力现象,危害极大.针对井下实际情况,在高瓦斯突出区域巷道掘进中应用好爆破技术,能起到非常重要的作用.     

一类四阶波动方程的弱解

研究下列初边值问题:utt αΔ2u-bΔut ututr g(u)＝0 in Ω×(0,∞);u(x,0)＝u0(x),ut(x,0)＝u1(x,0),x∈Ω;u＝(u)/(υ), x∈Ω的整体解的存在性和不存在性,以及整体解的惟一性和能量估计.这里Ω是Rn(n≥1)中的有界区域.借助于乘子方程,推出了整体解的能量衰减率.借助于势井理论,得到了在有限时刻内爆破的充分条件.由Galekin 近似方法得到解的存在性.     

“一字爆破”教学

小语第九册课《孙悟空三打白骨精》是《西游记》中较精彩的一个部分，经过整理加工后的《孙悟空三打白骨精》着重要批判的是唐僧的人妖颠倒、邪正不辨，突出孙悟空的智慧和斗争精神，加强了故事的思想性。但如何在课堂中渗透本课的思想性，让学生轻松理解、把握人物性格呢?笔在仔细钻研教材后，采用了一字爆破的教学方法，现记录如下：     

切顶爆破卸压技术在矿压防治中的应用研究

近年来,随着我国经济的快速发展,工程施工技艺不断革新,在矿压防治中常利用切顶爆破技术来治理矿压动力显现。本文主要针对切顶爆破卸压技术相关理论进行介绍,并且以一个工程作为案例进行分析,为广大研究切顶爆破卸压技术预防矿压工作者提供借鉴和参考。     

逐孔减震控制爆破技术在太和铁矿的应用

逐孔起爆在国外发展很快,技术也比较成熟,国内近两年,一些大的矿山都陆续在进行试用。本文中,笔者对于逐孔减震控制爆破技术在太和铁矿的应用做了简单的介绍,对于其中的一些问题进行了简单的总结,并提出了一定的解决方案,进一步的指导了实践。     

一类使局部化源抛物型方程组不同时爆破的临界指标

文章讨论一类具齐次Dirichlet边界条件的方程组ut=Δu+emu(x0,t)+pv(x0,t),vt=Δv+equ(x0,t)+nv(x0,t).其中x0是RN中有界区域内的固定点.通过四个充分与必要条件,得到解同时与不同时爆破的完整分类.有趣的是,在某指数范围内,大初值u0(v0)引起u(v)的爆破,而在这些初值之间,出现同时爆破.