振动出矿时碎岩的激励响应

振动出矿时,由于振动机的激励作用和波动传播的影响,碎岩便会产生激励响应,这种激励响应可以改变散体的动力特性和流动特征。介绍了双轴式惯性振动机激励原理和由其产生的激振力的数学表达式。认为碎岩具有黏滞阻尼特性,并在此基础上建立矿石激励响应的运动方程,且给出了简谐激励作用下的振型－位移近似表达式和坐标响应的稳态效应解。利用逐步积分算法求解了矿石激励响应的位移、速度和加速度的递推关系矩阵,并给出了计算流程图和算例。图3,表1,参8。     

堆中布液浸出高泥矿堆的机理研究

渗透效果是影响堆浸浸出效率的一种决定因素。对高泥矿堆进行了归类, 它包括矿石筑成的矿堆、废石堆及我国南方地区的富含稀土矿的丘陵。布液方式(包括堆顶布液、边坡布液、堆中布液和堆底布液)是影响高泥矿堆渗透效果的一个重要因素。通过分析溶浸液在高泥矿堆中的渗流力学特性及矿堆浸出动力学, 发现堆中布液不仅能很好地适应渗透性差的高泥矿堆堆浸浸出, 而且可缩短溶浸液所携气体成分达到堆中的时间, 还可有效减小或完全解决天气因素如多雨或寒冷所带来的负面影响, 是高泥矿堆的最佳布液方式。以室内试验、原地浸出稀土矿床的原状样模拟试验和生产实践论证了堆中布液对高泥矿堆的良好适应性。     

连续开采系统可靠性的故障树分析

地下矿山连续开采工艺是一大型复杂系统工程,为使整个系统工程达到最优,分析了地下矿山连续开采研究的４个层次,建立了Ⅰ＋Ⅲ型连续开采工艺系统模型,运用系统工程理论中故障树方法进行分析,用以查明系统最易发生故障的薄弱环节。     

基于CT图象法的矿岩散体孔隙结构分形特征研究

利用CT技术分别获取了溶浸柱浸出过程中上部、中部以及下部三个不同区域的断面图像，通过自编的Matlab程序对图像孔隙的分形维数进行了估算，并简要分析了导致溶浸柱中孔隙结构变化的主要因素。结果表明：堆浸过程中矿岩散体介质的孔隙结构存在着空间和时间的变异型，孔隙结构变异程度同细颗粒在物理及化学作用下的迁移与堆积等因素相关；孔隙分维数在浸前随高度的增加而减小，浸后则随着高度的增加而增大；同一区域位置断面分维数浸出后较浸出前均有所增加，下部增加幅度为上部的近19倍。     

采场振动机组连续作业线的工业试验研究

本文阐述了采场振动机组连续作业线的工业试验情况。工业试验结果表明：经改进完善后的振动连续作业机组各设备的结构更趋合理，运转工作性能稳定可靠。是一种完全能适应采场连续大量出矿运矿的新型装备，值得广泛推广与应用。     

岩爆条件下的开采技术

论述了在有岩爆危险的矿山所使用的采矿方法，并对岩爆、危害、预报、防治作了较详细的阐述，为进一步开展岩爆研究，提供了有益的启示。     

基于通风强化浸出的矿岩散体孔裂隙双重介质结构演化

为解决羊拉铜矿非生物堆浸中铜浸出效果不佳的问题,提出了通风强化浸出的设想,以期从改善浸堆体系渗透特性方面来提高浸出效果。首先,针对现有堆浸多孔介质渗流理论在分析复杂渗流规律中的不足,提出利用堆浸散体的孔裂隙双重介质理论来研究强制通风的影响机制;然后,对该矿浸堆的矿石粒级分布情况进行了分析;最后,开展了不同通风强度下的室内柱浸实验,利用CT扫描技术分析了不同试件孔隙的发育情况,并利用电镜扫描(SEM)与分形几何理论对不同通风强度下散体颗粒表面的分形维数、动态裂隙率及动态渗透系数进行了研究。结果表明：羊拉铜矿浸堆的松散细颗粒较多,矿堆密实度较高,矿石颗粒粒级分布不合理;引入强制通风可以促进堆浸体系的孔裂隙结构发展并会对堵塞的渗流通道形成有效冲破,从而提高浸出反应程度并强化浸出液中溶质的渗流性能,最终提高矿石浸出效果。     

Mobility factors of cracked ore in vibrating-ore draw shafts

The mobile factors of cracked ore in vibrating-ore draw shafts were analyzed. The results show that the mobile coefficient of cracked ores will be mainly influenced by the combination of ore physical factors if the structure dimension and parameters of vibrating ore-draw shafts are sure. It decreases with increasing the cohesion, lump content, lump size and powder content and increases with increasing the porosity. The coefficient decreases with increasing the moisture content, but increases after the moisture content reaches a certain value. Uniform grain leads to better mobility, non-uniform grain leads to worse mobility. The value of the mobile coefficient should be in a range of 0.3 - 1.1 when designing the vibrating ore-draw shafts. According to correlation degree of grey system theory, the effects of factors on the mobility of cracked ore are given in the weight decreasing consequence as follows: moisture content, lump content, distribution of grain size, lump size, porosity, cohesion and powder ore content. It is unreasonable to neglect any one because the values of their weights are not obvious.     

Stability analysis of new safety cleaning bank in steep slope mining

Based on the study of the slope with gently granular structure in Xingqiao open mine, a new safety cleaning bank mode for steep slope mining was developed, including setting up dint cut, and forming natural retaining wall based on the character of gentle incline slope. It can effectively eliminate the impact of sliding body on the bottom working place and slope body, reduce the dilution of ore, keep rainwater from upper steps away, decrease influence of the weak intermediate layer, and cut cost of disposal waste rock. The safety and reliability of the mode were analyzed and verified from 3 aspects: static load calculation, ANSYS simulation of dynamic loading and spot experiment. The result of static loading calculation shows that the retaining wall can support accumulation and extrusion of granular body, and the glide or overturn disaster will not take place. The simulations of dynamic loading show that the retaining wall remains stable until sliding body collapses from 360 m (10 sublevels). Only one new safety cleaning bank in each 1 - 5 sublevels can fully meet the need of engineering. The new mode sustains steep slope mining, increases the angle of ultimate slope, and reduces invalid overburden amount of rock by 3%-5%. The result of spot experiment has verified the exactness of the above calculations and simulations.     

Experiment and mechanism of dynamic drag reduction in pipeline transportation

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