Permeability evolution of deep coal under mining stress
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摘要: 为了研究深部开采工作面前方煤体的渗透属性，首先基于典型开采方式应力路径进行了不同瓦斯压力下的深部煤体渗透率测试，然后根据渗透率升降速率和单调性对渗透率的演化过程进行划分，归纳出常规三轴加载和采动应力下煤体渗透率演化过程概化模型，最后结合三向扰动应力下的深部煤体渗透率模型与二次多项式拟合关系建立了深部采动煤体全应力–应变渗透率理论模型。结果表明：典型开采方式采动应力路径下深部煤体的应力–应变曲线不存在压密阶段；峰值应力之前和之后测点的渗透率增加率上升幅度较小，而峰值点的渗透率增加率上升幅度较大；常规三轴加载的煤体渗透率曲线呈“V”字形，相应的概化模型包括下降段、峰前缓升段、急升段和峰后缓升段；采动应力下的深部煤体渗透率曲线呈倒“Z”字台阶形，相应的概化模型可划分为峰前缓升段、急升段和峰后缓升段；建立的渗透率理论模型能够表征不同开采方式下深部煤体全应力–应变过程的渗透率演化。Abstract: In order to investigate its seepage properties, the permeability of the coal in front of deep working face under different gas pressures is tested based on the mining stress path of typical mining layouts. Subsequently, the permeability evolution is divided according to the rate and monotonicity of permeability variation. Two conceptual permeability models for the coal under different stress paths are obtained. One is about the conventional triaxial loading, and the other is about the mining stress path. Moreover, according to the permeability model for deep coal under triaxial disturbance stress and the quadratic polynomial fitting relationship, a theoretical permeability model for the deep coal in complete stress-strain process is developed. The test results show that there is no compaction stage in the stress-strain curves of the coal under typical mining stress. The increase rate of permeability at the testing points before and after the peak stress is small, but that at the peak stress point is very large. The permeability curve of the coal under the conventional triaxial loading is V-shaped. The conceptual permeability model under the conventional triaxial loading can be divided into decreasing section, slow increasing section before the peak, sharp increasing section and slow increasing section after the peak. The permeability curve of the deep coal under mining stress is inverted Z-shaped. The conceptual permeability model under the mining stress path can be divided into slow increasing section before the peak, sharp increasing section and slow increasing section after the peak. Finally, it is validated that the developed theoretical permeability model can evaluate the permeability evolution of the deep coal under different mining layouts.
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Keywords:
- deep coal /
- permeability evolution /
- mining stress /
- conceptual model /
- complete stress-strain
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图 5 采动应力渗透试验测点布置
Figure 5. Layout of testing points for permeability tests under mining stress
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图 7 常规三轴加载下煤体渗透率试验结果
Figure 7. Permeability evolution of coal under conventional triaxial loading
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图 8 常规三轴试验渗透率概化模型
Figure 8. Conceptual permeability model for coal under conventional triaxial loading
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图 10 不同开采方式下深部煤体渗透率拟合结果
Figure 10. Permeabilities of deep coal under different mining layouts
表 1 不同开采方式下采动煤体渗透率测试
Table 1 Permeability tests of mining-induced coal under different mining layouts
序号 取样地点及文献 试验模拟埋深/m 模拟原岩应力/MPa 测试气体类型 年份 1 平煤八矿己14-14120工作面[9] 360 9 CH4 2012年 2 晋煤赵庄矿3号煤层[10] 360 9 CH4 2012年 3 平煤十矿己15-24080工作面[11] 600 15 CH4 2014年 4 川煤白皎矿2481工作面[12] 1000 25 CH4 2016年 5 南川宏能煤业矿井西翼K1煤层[13] 200 5 CH4 2016年 6 白皎矿#4煤层[14] 1000 25 CH4 2016年 7 兖州盆地[15] 1000 25 CH4 2017年 8 平煤八矿某工作面[16] 600 15 N2 2017年 9 平煤己15煤层[17] 320 8 CH4 2020年 
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表 2 不同气体压差下深部采动煤体力学特征结果
Table 2 Mechanical results of deep coal under different gas pressures
试件编号 气体压差/MPa 峰值应力/MPa 峰值应变/% P1 0.5 52.53 0.92 P2 1.0 48.08 0.67 P3 1.5 49.82 0.71 P4 2.0 48.05 0.68
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表 3 峰值应力前后测点渗透率增加率
Table 3 Increase rates of permeability before and after peak stress
试件编号 ηbcp ηcp ηacp P1 1.00 37.24 44.64 P2 0.56 7.30 9.31 P3 0.79 8.75 9.19 P4 5.10 41.51 57.39
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孔隙率ϕ0/% 煤体泊松比vb 内摩擦角/(°) 煤体弹性模量Eb0/GPa 裂隙弹性模量Ef0/GPa εL/% PL/MPa FI Biot系数αb 10.11 0.22 25.12 6.84 3.00 0.52 3.34 0.20 1.00
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表 5 峰后缓升段渗透率拟合系数
Table 5 Fitting coefficients in slowly increasing zone after peak stress
开采方式 χ1 χ2 χ3 R2 保护层 7.195×10-15 2.531×10-7 1.878 0.9894 放顶煤 -2.195×10-15 1.578×10-7 1.754 0.9253
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