基于地应力测量和三维建模技术,对黄岩汇15111工作面褶曲构造应力场进行了反演,研究了构造应力区采空区边缘不同位置处煤层顶板垂直应力的分布特征,不同位置处护巷煤柱上垂直应力、巷道顶板水平应力、以及巷道围岩变形量随煤柱宽度增加而变化的规律,并据此探索了一种确定构造应力区沿空巷道合理窄煤柱宽度方法,确定该构造应力区窄煤柱宽度为6.5 m。研究发现:构造应力区采空区边缘应力集中系数减少量在背斜左翼、向斜右翼中部最为明显;处于背斜左翼、向斜右翼中心对称位置煤柱上垂直应力、巷道顶板水平应力曲线呈“分别相似”特征,且该特征随着煤柱宽度增加而变得明显;构造应力区窄煤柱上垂直应力峰值偏向巷道侧,且垂直应力场随着煤柱宽度增加出现明显的内、外应力场;构造应力对沿空巷道顶板水平应力的分布也有影响,煤柱宽度为4.0~8.0 m时,巷道顶板水平应力自褶曲背向斜交界处向背、向斜轴部呈递减趋势,煤柱宽度为9.0~16.0 m时,呈递增趋势;褶曲对巷道围岩变形量的影响在煤柱宽度较窄时较为明显,在煤柱宽度4.0~10.0 m时,褶曲背、向斜中心对称位置巷道围岩变形量呈“分别相似”特征,煤柱宽度大于10.0 m后褶曲背、向斜中心对称位置巷道围岩变形量变化特征趋于一致。

Based on the 3D modeling techniques and the measurement of in-situ stress, the tectonic stress field in 15111 working face in Huangyanhui coal mine was inversed. Also,the distribution characteristics of vertical stress on coal seam roof,the vertical stress on the coal pillar along the roadway,the horizontal stress of roadway roof and the de- formation of surrounding rock at different positions along the edge of the gob-area in tectonic stress zone were investi- gated. According to the research result,a method of determining the reasonable narrow coal pillar width in gob-side en- try in tectonic stress area was explored,and the narrow coal pillar width in this research was determined to be 6. 5 m.The investigation indicates that the reduction of stress concentration factor at the edge of gob-area in tectonic zone is most obvious in the left side of anticline and the right side of oblique,the vertical stress curve of the narrow coal pillar and horizontal stress curve of roadway roof at the symmetrical position of the anticline and the oblique have a respec- tively similar character,and it becomes more obviously as the coal pillar width increases,at the same time,the vertical stress peak on the narrow coal pillar close to the side of the roadway and the stress curve shows obvious internal and external stress fields as the coal pillar increases. In the tectonic stress zone,the vertical stress peak on the narrow coal pillar tends to the side of the roadway,and the vertical stress field shows obvious internal and external stress fields as the coal pillar width increases. In addition,the tectonic stress also affect the horizontal stress distribution of roadway roof along the gob-side,when the coal pillar width is 4. 0-8. 0 m,the horizontal stress at the roadway roof decreases gradually from the junction of oblique and anticline to the axis of anticline and syncline,and it turns to an increase character as the coal pillar width increases to 9. 0-16. 0 m. The effect of folds on the deformation of surrounding rock is obvious when the pillar width is narrow,the roadway deformation in two sides of the fold show respectively similar character when the coal pillar width is 4. 0-10. 0 m,while the trend changes to share a similar character when the width wider than10. 0 m.

1.工程概况

2.地应力测量与数值模型的建立

    2.1 地应力测量

    2.2 数值模型的建立

3.煤柱宽度优化研究

   3.1 理论计算

   3.2 构造区应力场反演

   3.3 煤柱宽度优化研究

4.模拟结果和现场实测分析

   4.1 构造应力区水平应力反演情况

   4.2 采空区边缘煤层上垂直应力变化特征

   4.3 构造应力区煤柱上垂直应力变化特征

   4.4 巷道顶板水平应力分布特征

   4.5 巷道围岩变形量变化特征

   4.6 现场巷道围岩变形监测

5.结论