风积沙矿区开采沉陷影响因素研究

Research on Main Influence Factors of Mining Subsidence in Aeolian Sand Mining Area

以补连塔风积沙矿区12407工作面为研究背景,采用层次分析法,从开采因素和地质因素2个方面选取了9个指标作为开采沉陷的影响因子,建立了风积沙矿区开采沉陷影响因素分析模型。在此基础上构造了5个具有不同松散层厚度、基岩厚度、沙基比和覆岩综合普氏硬度的数值实验模型,进行了数值分析。研究表明,采深保持不变时,松散层厚度和沙基比与地表最大下沉值正相关,基岩厚度和覆岩综合普氏硬度与地表最大下沉值负相关。

12407 coal mining face of Bulianta aeolian sand mining area is taken as a research subject,the analytic hierarchy process was applied to select 9 indexes as the mining subsidence influence factors from mining and geological background and constructs a model for influence factors analysis of mining subsidence in aeolian sand mining area.Based on this analysis,five numerical models were established with different thickness of lose overburden strata,bedrock thickness,the ratio of sand and bedrock,and comprehensive hardness of cover rocks.The result indicates that the thickness of lose overburden strata and the ratio of sand and bedrock with the maximum ground subsidence value are positive correlation,and bedrock thickness and the comprehensive hardness of cover rocks are negative correlation.