...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal Of The South African Institute Of Mining & Metallurgy >Distinguishing and controlling the key block structure of close-spaced coal seams in China
【24h】

Distinguishing and controlling the key block structure of close-spaced coal seams in China

机译：区分和控制中国近距离煤层的关键块结构

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Based on the complicated geological production conditions and abnormal strata behavior of the fully mechanized caving face No. 102 in the Xinyang Coal Mine, we analyze the breaking and forming process of distinguishing key block structures in close spaced coal seams. This analysis establishes an integrated mechanical model of these distinguishing structures. Furthermore, the horizontal force T_(AB) generated by downward key blocks A and B is quantified, as is the Pressure P_G exerted by key block B on caved gangue. Finally, the interaction mechanism is revealed. Analysis of the results using Mathematica reveal the following: 1. Both T_(AB) and P_G exhibit approximately inverse relationships to coal pillar width b; 2. T_(AB) exhibits an approximately exponential relationship with mining height M of which the base is greater than 1; 3. PG exhibits an approximately arctangent relationship with mining height M. Combining these results with field observations, we conclude that the area in the vicinity of supports 100#-120# in the upper area of working face No. 102 is the likely zone of abnormal strata behavior. Thus, this area was classified as a key control area. Based on these results, the graded support control technique is proposed. Application of this technique in the field resulted in a reduction in the rate of hydraulic support system malfunction from 47% to 7% in the key control area. In addition, during times of periodic mining pressure, the roof caving height value never exceeded 0.3 m and the maximum spalling depth never exceeded 0.2 m. Overall, the results indicate that this new technique has markedly increased the stability of surrounding support rock material.
机译：基于金阳煤矿的复杂地质生产条件和全能机械化洞穴的异常地层行为，分析了区分间隔煤层中的关键块结构的破裂和形成过程。该分析建立了这些区别结构的综合机械模型。此外，由向下键块A和B产生的水平力T_（AB）被量化，因为压力P_G被腔内块B上的压力P_G施加在塌陷的兆内。最后，揭示了相互作用机制。使用MathematicA的结果分析以下内容：1。T_（AB）和P_G展示与煤柱宽度B大致反比关系; 2. T_（AB）与底座大于1的矿井高度M表示近似指数关系; 3. PG与采矿高度展现出近似的畸形关系。将这些结果与现场观测结合起来，我们得出结论，在工作面上的上部区域中的支撑100＃-120＃附近的区域是可能的区域异常的地层行为。因此，该区域被归类为关键控制区域。基于这些结果，提出了分级支持控制技术。该技术在该领域的应用导致液压支撑系统故障降低47％至7％的关键控制区域。另外，在周期性挖掘压力期间，屋顶塌陷高度值从未超过0.3μm，最大剥落深度从未超过0.2μm。总体而言，结果表明，这种新技术显着提高了周围支撑岩材料的稳定性。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号