唐洞煤矿应用控制爆破技术拆除付井绞车基础

本文介绍了资兴矿务局唐洞煤矿八一井采用控制爆破技术，拆除付井绞车基础，废弃其一部份，保护其另一部份继续使用，取得了很好的效果，为煤矿进行基础改造设计提供了有益的经验     

Failure modes of PDC cutters under different loads

The capability of several types of flat PDC cutters to withstand combined loads were tested and evaluated by the impact and cutting of single PDC cutter on granite in a linear impact-cutting table.The primary failure modes of PDC cutters withstanding different combined loads were investigated and analyzed.The suggestions of enhancing PDC cutters to be suitable for drilling very hard rock have been made.     

薄煤层提高块煤率的爆破参数优化

为提高薄煤层开采中的块煤率，基于控制爆破技术原理，提出了“大孔距装药，密集孔导向成缝，挤压孔超深微差起爆”，设计了爆破参数试验方案，经试验块煤率得到显著提高。     

水力采煤适用条件的综合评价

集我国水力采煤矿井三十多年之生产经验，应用模糊数学，灰色系统理论对水采适用条件进行综合评价。     

进路法回采顶柱人工假顶的稳定性分析

针对用进路法回采顶柱的人工假顶暴露形状为矩形的矿山地下结构，应用薄板理论和能量原理对其稳定性进行分析。通过建立进路结构力学模型，得出院 假顶变形阶段的挠曲，应力与假顶的强度，受力及工程尺寸等参数的关系式，并具体应用于新城金矿的顶柱回采实践中，结果表明：运用该理论方法分析采场稳定性在生产实际中具有很好的指导作用。     

爆炸荷载下高耸建筑物过早断裂的数值模拟

爆破拆除高耸建筑物时,爆破切口的爆炸荷载必然产生爆破震动,但有关拟爆物自身震动危害的研究较少,一般以经验来估计爆破震动的影响。采用数值模拟,通过分析爆炸荷载引起的拟爆烟囱上部结构的动力响应来研究爆破震动对过早断裂的影响。结合现场爆破观测的结果,其结论是爆破切口产生爆炸荷载对上部结构的断裂有相当影响,是筒体过早断裂及反向倾转的主要原因,爆炸荷载作用下,烟囱简体高度的55%～75%范围内是断裂危险区,对风化严重等强度低的砖烟囱进行爆破拆除时,尤其应控制单响起爆药量与起爆的间隔时间。     

破碎难采矿体开采地压的测试研究

针对新城金矿极破碎顶底柱难以安全采出的情况，开展了采场地压规律的动态监测。应用YZY型钻孔应力传感器和二次接收仪测量采场地压变化，采用电子数显式收敛计量测围岩变形，得出了顶底往开采地压变化的一般规律，为选择合理的矿柱开采方案和地压控制措施提供了科学的依据。     

巷道放顶煤松动高度的确定

巷道放顶煤是急倾斜中厚-厚煤层安全、高效开采的一种新方法.应用模糊数学和灰色理论,建立模型确定顶煤初采松动高度,经试验证明是合理的、可行的.     

冲击载荷作用下岩石破碎数值模拟及试验研究

运用数值模拟方法研究了冲击载荷作用下的岩石微观结构特性变化,通过对岩石内部应力分布及裂纹分布图可以得出冲击载荷破岩时岩石内部在垂直方向产生一个拉应力区和一个压应力区,刀具下方的拉应力最大;中间裂纹扩展速度比径向和侧向裂纹都要快,裂纹面呈三角形状。在多功能试验装置上对花岗岩进行冲击载荷破岩试验,试验结果表明:单纯提高冲击载荷对破岩效果不会有很大的提高,存在一个最佳破岩冲击能(63J)。     

Complete splitting process of steel fiber reinforced concrete at intermediate strain rate

The complete splitting process of steel fiber reinforced concrete （SFRC） at intermediate strain rate was studied by experiment. The basic information of a self-developed SFRC dynamic test system matching with lnstron 1342 materials testing machine was given, and the experiment principle and the loading mode of cubic split specimen were introduced. During the experiment, 30 cubes of 150 mm×150 mm×150 mm and 36 cubes of 100 mm×100 mm×100 mm, designed and prepared according to C20 class SFRC with different volume fractions of steel fiber （0, 1%, 2%, 3%, 4%） were tested and analyzed. At the same time, the size effect of SFRC at intermediate strain rate was investigated. The experimental study indicates that SFRC size effect is not influenced by the loading speed or strain rate. When the steel fiber content increases from 0 to 4%, the splitting strength of SFRC increases from 100% to 261%, i.e. increasing by 161% compared with that of the common concrete. The loading rate increases from 1.33 kN/s to 80.00 kN/s, and the splitting tensile strength increases by 43.55%.