首页> 美国政府科技报告 >Design Optimization in Underground Coal Systems:Section 1. Structural Parameters of Coal Measure Rocks. Section 2. Longwall Mining System Strata Simulator. Section 3. Design Criteria for Underground Roof-Truss Support Systems. Interim Report,April--June 1977.
【24h】

Design Optimization in Underground Coal Systems:Section 1. Structural Parameters of Coal Measure Rocks. Section 2. Longwall Mining System Strata Simulator. Section 3. Design Criteria for Underground Roof-Truss Support Systems. Interim Report,April--June 1977.

机译:煤炭地下系统设计优化:第1节煤系岩石结构参数。第2节。长壁采矿系统地层模拟器。第3节地下屋架 - 桁架支撑系统的设计标准。中期报告,1977年4月至6月。

获取原文

摘要

Research in areas related to coal mining was continued. Computer programs related to longwall mining were developed and tested. The work of sampling and testing of coal specimens continued,especially with respect to the effects of size and shape (cylinder vs cube) of the specimens on the measured properties. In addition,loading rate appears to be of some significance. The literature of supports in underground mining has been reviewed,especially with respect to roof bolts and roof trusses. The testing of functional plastic models of roof trusses by photoelastic methods has been continued. Monitoring of instrumented roof trusses in Alabama has been continued. (ERA citation 03:020916)

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