The granular dynamic shear strength is the same as that of the staatic one in nature, as found from munerous experiments and investigations. The shear strength is equal to the sum of the interanl frictional rorce and the cohesive force. The influences of type, shape, size distriburion, proe ratio, moisture content and variation of vibration velocity on the dynamic shear strength of granules were stuied. Based on numerous vibration shear experiments, the authors investigate the mechanism of dynamic shear strength in granules in etrms of the fundamental principle and the relevant theory of modem tribology.

In order to resolve how to mine under the comdition of high stress with rockburst, this paper analyzes the law of rockburst, and considers that most of the rockbursts occur in the high stress area of stope. A method rockburst forecast, and its steps are given, and three different stages of rockburst ane identified. Furhtermore, this paper considers that blasting energy can effectivley control rocdburst by changing the characteristics of rock mass, which decreases the probability of rockburst happening. According to characteristics of rockburst, two feasible mining techniques uneder rockburst conditions are put forward, that is stoping-and-filling method, and sublevel caving method of mining withour any sills in hanging wall.

The paper stueies the probability of indusrial application of vibration liquefaction of bulk solid from the opposite point of view, and proposing turning its harmful effects into benefits. Utilizing a new device of vibration liquefaction and by compacting saturated bulk solid, a set of additional device for experiment was designed. These experiments examined the problems related to vibration liquefaction of fine-ores and tailings on the basis of DSA-1 type direct shear apparatur, including models of straight of vibration liquefaction and compacting of tailings were studied, and future application of technique to miees has been put forward.

Based on the analysis of the disadvantages of traditional methods in reducing pipeline resistance, the new conception of dynamic drag reduction in pipeline transportation has been proposed. The experimental results and mechanism of dynamic reduction of pipeline resistance were also discussed in detail. The main conclusion is that the dynamic reduction of resistanee exerts forces on the moving materials along both the radial direction and the axial direction. The radial force throws the materials upwards to depart from the pipe wall to reduce the frietional force, while the axial force directly reduces the resistance by providing the force to overcome the drag.

应用神经网络模式识别原理，构建一种人工神经网络（ANN）——弹性神经网络，能较好地解决常用BP神经网络梯度算法中可能出现的收敛缓慢和局部最小问题，将模型应用于大红山铜矿缓倾斜中厚矿体采矿方法模糊优选，与用模糊数学法得出的结论基本一致。终选出的采矿方法工业试验后取得了显著成效，证明该决策方法切实可行。

当溶浸液对犷石中有用物质的溶解能力一定时，决定堆浸效果好坏的因紊则取决于溶漫液在矿堆中的渗透效果，对于高泥矿堆尤其如此。由于土矿物含童较高，高泥矿堆渗透性差，这必然导致堆浸效果差。为了有效地浸山其中有用矿物，必须改善其渗透性。从分析高泥犷堆低渗透性的原因着手，进而对改善其渗透性的机理进行研究，得出可从6个方面的措施.最后对各类措施进行了分类总结，并结合以上6个方面作了对比，得出堆中布液可较全面地改善高泥矿堆的渗透性，如将几个措施联合运用将能更好地改善高泥矿堆的渗进性，更有效地提高其堆浸效果。图4，表1，参12。

在有关假设条件下，给出了几个基本控制方程式，并得出了饱和散体中的波动传播方程。分析推导了波在无耗散情况下的势矢量方程和3种件波的速度表达式以及具有耗敲情形的势矢量的普遍方程式和P波与S渡的衰减系数。通过尾砂和铁粉矿的振动液化试验观察并记录振动液化时，饱和散体中孔隙水压力的变化情况，结果表明：随着振动的施加，孔隙水压力迅速升高，并表现出一定的波动性。利用波动理论和试验结果t详细分析了振动过程中饱和散体介质的3种体波的传播对孔隙水和颗粒的作用情况，揭示了孔隙水压力迅速升高和饱和教体液化的波动机理。

分析了地下金属矿山连续采矿的技术经济优势，提出了我国地下金属矿山连续采矿技术研究分4个发展阶段，即采场(溜井)振动出矿、采场连续大量采矿、区域无间柱连续采矿及全矿连续大量采矿阶段等，结合国家“九五”重点科技攻关课题“无间柱连续采矿试验研究”，详细介绍了工业试验的技术条件、连续采矿方案设计的技术思想、采矿方案设汁、回采工艺技术、大量采矿装备及主要研究成果。

视流动场中的散体为弱横观各向同性介质，推导了P波、SH波和SV波的相速度表达式，分析了它们在流动散体介质中的传播特点：P波波前为椭圆形或近似椭圆形，SH波波前为椭圆形，SV波波前为非椭圆形。由波的传播特点得出在振幅和频率较小的情况下，振波对散体的流动性影响不大。当振幅和频率逐渐增加时，椭球体的偏心率减小，散体间的粘性阻力和内摩擦力降低，散体的松散系数增加，抗剪强度降低，使散体具存更好的流动性。实验结果验证了推导与分析的正确性。

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。