To study the heights of the caved zone and water-conducting fracture zone in backfill mining,the failure mechanism of strata during backfill mining was analyzed,and a method for determining the heights of the two zone...To study the heights of the caved zone and water-conducting fracture zone in backfill mining,the failure mechanism of strata during backfill mining was analyzed,and a method for determining the heights of the two zones was proposed based on key strata theory.The movement and failure regularity of the strata above the backfilling panel were revealed through numerical simulation.Considering the geologic conditions of the CT101 backfilling panel,the height of the fracture zone was determined using the proposed method along with empirical calculation,numerical simulation,and borehole detection.The results of the new calculation method were similar to in situ measurements.The traditional empirical formula,which is based on the equivalent mining height model,resulted in large errors during calculation.The findings indicate the reliability of the new method and demonstrate its significance for creating reference data for related studies.展开更多
结合华中西南电网运行实际,提出在特高压工程建设过渡期系统强直弱交背景下,区域互联大电网的主要运行风险和控制措施。首先阐述了华中西南电网的强直弱交、直流送受并重的结构特征,分析了华中西南强直弱交区域互联大电网的主要安全风险...结合华中西南电网运行实际,提出在特高压工程建设过渡期系统强直弱交背景下,区域互联大电网的主要运行风险和控制措施。首先阐述了华中西南电网的强直弱交、直流送受并重的结构特征,分析了华中西南强直弱交区域互联大电网的主要安全风险,包括特高压交流联络线功率波动、特高压直流故障、直流受端交流系统故障和送端500 k V交流系统故障,对比了交直流故障影响。最后,针对当前的运行风险,提出防控措施,主要包括运行方式预控、配置和优化安全控制措施、优化电网第三道防线等。展开更多
基金Supported by the National Key R&D Program(2018YFC0604501).
文摘To study the heights of the caved zone and water-conducting fracture zone in backfill mining,the failure mechanism of strata during backfill mining was analyzed,and a method for determining the heights of the two zones was proposed based on key strata theory.The movement and failure regularity of the strata above the backfilling panel were revealed through numerical simulation.Considering the geologic conditions of the CT101 backfilling panel,the height of the fracture zone was determined using the proposed method along with empirical calculation,numerical simulation,and borehole detection.The results of the new calculation method were similar to in situ measurements.The traditional empirical formula,which is based on the equivalent mining height model,resulted in large errors during calculation.The findings indicate the reliability of the new method and demonstrate its significance for creating reference data for related studies.
文摘结合华中西南电网运行实际,提出在特高压工程建设过渡期系统强直弱交背景下,区域互联大电网的主要运行风险和控制措施。首先阐述了华中西南电网的强直弱交、直流送受并重的结构特征,分析了华中西南强直弱交区域互联大电网的主要安全风险,包括特高压交流联络线功率波动、特高压直流故障、直流受端交流系统故障和送端500 k V交流系统故障,对比了交直流故障影响。最后,针对当前的运行风险,提出防控措施,主要包括运行方式预控、配置和优化安全控制措施、优化电网第三道防线等。
