准确全面地实现企业生产过程数据采集是进行监管及报检批合格评定的依据与保证。在分析企业运行模式、产品属性的基础上,设计了企业生产过程数据采集方案,通过在企业端设立工控采集设备、仪器仪表、视频仪、条形码采集器来进行数据采集...准确全面地实现企业生产过程数据采集是进行监管及报检批合格评定的依据与保证。在分析企业运行模式、产品属性的基础上,设计了企业生产过程数据采集方案,通过在企业端设立工控采集设备、仪器仪表、视频仪、条形码采集器来进行数据采集,选用SQL Server 2000作为数据库服务器,企业端及监控端通过Internet进行连接,遵守HTTP协议。该数据采集方案基本能满足监管系统的要求。展开更多
Based on the boundary support conditions of overlying high-position,hard and thick strata,a Winkler foundation beam mechanical model was built.Computational expressions for the characteristics and position of the bend...Based on the boundary support conditions of overlying high-position,hard and thick strata,a Winkler foundation beam mechanical model was built.Computational expressions for the characteristics and position of the bending moment for high-position,hard and thick strata were constructed by theoretical analysis,and the initial breaking position of high-position,hard and thick strata was also analyzed.The breaking process and evolution law of mining stress in high-position,hard and thick strata were studied by similar material simulation tests.Studies show that:due to the foundation deformation effect of the lower strata,the initial break position in high-position,hard thick layers is in the middle of goaf;vertical tension fractures first occur under the middle surface,then tilt tension fractures form at both sides and a non-uniform thickness of the fracture structure forms and produces subsidence deformation;behind the coal wall tilt fractures extend and eventually complete the migration.Mining stress produces obvious changes before and after the breakage of the high,hard and thick stratum;high stress concentration forms in front of the coal wall before breakage and fracture stress concentration significantly reduces after migration.Coal seam mining under high-position,hard thick strata can easily induce dynamic phenomena.展开更多
文摘准确全面地实现企业生产过程数据采集是进行监管及报检批合格评定的依据与保证。在分析企业运行模式、产品属性的基础上,设计了企业生产过程数据采集方案,通过在企业端设立工控采集设备、仪器仪表、视频仪、条形码采集器来进行数据采集,选用SQL Server 2000作为数据库服务器,企业端及监控端通过Internet进行连接,遵守HTTP协议。该数据采集方案基本能满足监管系统的要求。
基金financially supported by the National Natural Science Foundation of China (No.51374139)the Natural Science Foundation of Shandong Province (No.ZR2013EEM018)the Scientific Research Innovation Team Support Plan of Shandong University of Science and Technology
文摘Based on the boundary support conditions of overlying high-position,hard and thick strata,a Winkler foundation beam mechanical model was built.Computational expressions for the characteristics and position of the bending moment for high-position,hard and thick strata were constructed by theoretical analysis,and the initial breaking position of high-position,hard and thick strata was also analyzed.The breaking process and evolution law of mining stress in high-position,hard and thick strata were studied by similar material simulation tests.Studies show that:due to the foundation deformation effect of the lower strata,the initial break position in high-position,hard thick layers is in the middle of goaf;vertical tension fractures first occur under the middle surface,then tilt tension fractures form at both sides and a non-uniform thickness of the fracture structure forms and produces subsidence deformation;behind the coal wall tilt fractures extend and eventually complete the migration.Mining stress produces obvious changes before and after the breakage of the high,hard and thick stratum;high stress concentration forms in front of the coal wall before breakage and fracture stress concentration significantly reduces after migration.Coal seam mining under high-position,hard thick strata can easily induce dynamic phenomena.
