不同压实矸石充填体置换“三下”煤柱的岩层移动规律  

STRATA MOVEMENT WHERE COAL-PILLAR UNDER WATER,BUILDING OR RAILWAY IS REPLACED BY GANGUE BACKFILLS OF DIFFERENT COMPACTNESS

作　　者：余伟健[1] 王卫军[2] 

机构地区：[1]湖南科技大学煤矿安全开采技术湖南省重点实验室,湘潭411201 [2]湖南科技大学能源与安全工程学院,湘潭411201

出　　处：《力学与实践》2011年第2期39-45,70,共8页Mechanics in Engineering

基　　金：湖南省科技计划重点项目(2009FJ2005);湖南省教育厅资助项目(10C0665);湖南省高校科技创新团队支持计划资助

摘　　要：为了分析不同压实矸石的充填体置换"三下"煤柱所引起的岩层移动及稳定性等问题,采用弹簧原理和弹塑性理论分析了上覆岩层和矸石充填支撑体的压缩机理,并推导了矸石充填体的初期压缩量;根据充填体的压实原理、岩层力学及相关理论,推导了不同矸石充填体压实度所对应的压缩值及等价采高的解析式;结合工程实例,采用理论计算和数值模拟方法分析了不同矸石充填体置换煤柱所对应的上覆岩层移动规律.结果表明,随着充填体压实度的减小,二次岩层移动所引起的顶板下沉值和等价采高都是不断增大的,而当孔隙比达到0.55左右,所得到的等价采高H_e增长速度更加灵敏,并且最大侧向位移增加趋势明显加快.In order to study strata movement and stability where coal-pillar under water,building or railway is replaced by gangue backfills of different compactness,spring principle and elastic-plastic theory are used to analyze the compression mechanism of gangue backfills as supporting bodies,and related formula for the early stage compression is obtained.The compression value and the equivalent mining height for different compactness is obtained based on compaction principle of gangue backfills and rock mechanics.In a engineering example,the theoretical calculation and the numerical simulation are used to analyze strata movement for gangue backfills of different compactness.It is shown that the roof subsidence and the equivalent mining height of quadratic strata movement steadily increase with the decrease of compactness degree of gangue backfills.When the void ratio is about 0.55,the increment speed of equivalent mining height becomes very sensitive and the rising tendency of the maximum side displacement become marked.

关 键 词：压实度 矸石充填 “三下”煤柱 岩层移动 

分 类 号：TD322.4[矿业工程—矿井建设]