深井近距离煤层采场围岩应力-应变场演化影响机理研究

Study on the Influence Mechanism of Stress-Strain Field Evolution of Stope Surrounding Rock in Deep Well and Close Distance Coal Seams

以华能邵寨煤矿1502、1801工作面为研究背景,采用土力学、材料力学结合岩石力学的理论分析方法,并以有限元数值模拟软件进行实验方案设计,对采场围岩的应力-应变场随采动影响的演化规律展开研究。建立近距离5^(#)、8^(#)煤层采场巷道围岩内影响力学模型并确定顶底板岩层边界条件,得到上方1502工作面采空条件下底板内应力条件并建立对1801工作面顶板受力情况影响的耦合作用内因公式,可作为理论依据确定最适合邵寨煤矿1502、1801工作面矿压控制手段及其工艺参数。

Based on the research background of the 1502 and 1801 working faces of Huaneng Shaozhai Coal Mine,the theoretical analysis method of soil mechanics,material mechanics and rock mechanics is adopted,and the experimental scheme is designed with finite element numerical simulation software,to study the evolution law of the stress-strain field of the surrounding rock of the stope with the influence of mining.Establish the mechanical model of influence in surrounding rock of the stope roadway of the close distance 5^(#)and 8^(#)coal seams and determine the boundary conditions of the roof and floor strata,obtain the stress conditions of the floor under the goaf conditions of the upper 1502 working face,and establish the coupling internal cause formula of the influence on the stress conditions of the roof of the 1801 working face,which can be used as the theoretical basis to determine the most suitable mine pressure control measures and its process parameters for the 1502 and 1801 working faces of Shaozhai Coal Mine.