特厚煤层边界条件转化期间矿压研究与控制技术

Ground Pressure Research and Control Technology on Transformation of Boundary Conditions in Extra Thick Seam Mining

以水帘洞煤矿沿空巷道为工程背景,采用FLAC3D软件模拟,得到一面采空到两面采空及其转换过程中小煤柱和沿空巷道围岩应力分布特征,通过理论分析建立特厚煤层沿空巷道覆岩结构模型,对小煤柱和沿空巷道进行稳定性分析。对试验巷道回采期间支护方案进行设计和加固,并采用多种手段跟踪监测。结果表明,巷道支护设计有效,围岩应力、变形和顶板离层等控制效果良好。

Taking Shuiliandong mine roadway as 1engineering background,the distribution characteristic of the stress distribution of narrow pillar and god-side entry surrounding rock was obtained by analyzing the thick seam mining working conditions from one side goaf to both sides goaf,and during the conversion between them through using the FLAC3 Dnumerical software,through the theory established model of god-side entry cover load structure in thick coal seam,and analyzed the stress distribution of narrow pillar and god-side entry surrounding rock.On this basis,support scheme of test roadway was designed and reinforced during stoping,and the use of a variety of means to monitor the effect of practice,results showed that the design of roadway support was effective,surrounding rock stress、deformation and roof separation has good control effect,studies show that support the guiding ideology and the basic theory is correct,the results can be applied under similar conditions.