导水裂隙带发育高度与主关键层下基采比的关系研究  

Research on relationship between the development height of water conducted zones and the ratio of bedrock and mining under primary key stratum

作　　者：杨雷磊 Yang Leilei(State Key Laboratory for Gas Disaster Monitoring and Emergency Technology,Chongqing 400037,China;CCTEG Chongqing Research Institute,Chongqing 400037,China)

机构地区：[1]瓦斯灾害监控与应急技术国家重点实验室,重庆400037 [2]中煤科工集团重庆研究院有限公司,重庆400037

出　　处：《能源与环保》2024年第1期25-30,共6页CHINA ENERGY AND ENVIRONMENTAL PROTECTION

基　　金：国家自然科学基金面上项目(51574279)。

摘　　要：针对不同主关键层下基采比导水裂隙带发育高度不同的问题,为确定主关键层下基采比对主关键层稳定性和导水裂隙带发育高度的影响,在关键层理论模型基础上,建立采场覆岩的力学模型,并分析关键层的破断机理。应用UDEC数值模拟软件,建立2种主关键层下基采比变化模型,分析了主关键层破断的条件,研究了导水裂隙带高度与主关键层下基采比的关系。研究结果表明,主关键层破断前后导水裂隙带高度随关键层下基采比的变化趋势不同,主关键层破断时关键层下基采比的临界值为7~10;当关键层下基采比小于7时,主关键层位于裂隙带;当关键层下基采比大于10时,主关键层位于弯曲下沉带。According to the issue of varying development heights of water conducted zone with different ratios of bedrock and mining under primary key stratum(PKS),in order to determine the influence of the basic mining ratio under the PKS on the stability of the PKS and the development height of water conducted zones,a mechanical model of the overlying rock in the mining area was established on the basis of the theoretical model of the PKS,and the fracture mechanism of the key stratum was analyzed.Using UDEC numerical simulation software,two models for the variation of the ratio of bedrock and mining under the KPS were established.The conditions for the fracture of the KPS were analyzed,and the relationship between the height of the water conducted zone and the ratio of bedrock and mining under the KPS was studied.The research results showed that the height of the water conducted zone before and after the KPS was broken had different trends with the change of the ratio of bedrock and mining below the key stratum.The critical value of the ratio of bedrock and mining below the KPS when the KPS was broken was 7~10.When the ratio of bedrock and mining below the key stratum was less than 7,the KPS was located in the fractured zone.When the ratio of bedrock and mining below the key stratum was greater than 10,the main key stratum was located in the bending and sinking zone.

关 键 词：主关键层 导水裂隙带 基采比 数值模拟 

分 类 号：TD823[矿业工程—煤矿开采]