Multi-physical field parameter response in the whole process of coal and gas outburst under deep high stress
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摘要:
基于深部煤与瓦斯突出全过程的热−流−固耦合规律，建立了煤与瓦斯突出数值模型，分析了深部高应力条件下突出全过程中多物理场参数响应。研究结果表明：突出孔洞周围煤岩体应力场的响应规律为初始振动−突然衰减−后期稳定；瓦斯压力的下降速率与距离突出口的长度呈负相关关系；突出过程中，破碎煤所包含的吸附瓦斯迅速解吸并且膨胀做功，导致温度降低；突出发生后，渗透率发生显著变化的区域可分为突增区、中等增长区和增长区；随着应力的增加，弹性潜能占煤与瓦斯突出总能量的比例不断增加，弹性潜能占比与应力呈正相关关系。
Abstract:Based on the thermo-fluid-solid coupling law of coal and gas outburst in deep mining, a numerical model of coal and gas outburst is established, and the response of multi-physical parameters in the whole process of coal and gas outburst under high stress condition is analyzed. The results show that the response rule of the stress field around the outburst hole is initial vibration-sudden attenuation-late stability. The decreasing rate of gas pressure is negatively correlated with the length of the outburst hole. In the outburst process, the adsorbed gas contained in the crushed coal quickly desorbed and expanded to do work, resulting in a decrease in temperature; the areas with significant changes in permeability after outburst can be divided into sudden increase area, medium increase area and increase area. With the increase of stress, the proportion of elastic potential in total coal and gas outburst energy increases, and the proportion of elastic potential is positively correlated with stress.
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Keywords:
- deep mining /
- coal and gas outburst /
- stress /
- multiple physical fields /
- energy condition
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图 3 距离突出口不同位置处应力场响应规律
Figure 3. Response law of stress field at different positions from the outburst
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图 5 距离突出口不同位置处瓦斯压力场响应规律
Figure 5. Response law of gas pressure field at different positions from outburst
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图 7 距离突出口不同位置处温度场响应规律
Figure 7. Response law of temperature field at different positions from the outburst
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图 9 单位体积含瓦斯煤岩体弹性潜能与应力关系
Figure 9. Relationship between elastic potential and stress of gas bearing coal rock mass per unit volume
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图 10 弹性潜能、瓦斯内能占比与应力关系
Figure 10. Relationship between elastic potential, gas internal energy ratio and stress
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图 11 突出时临界瓦斯压力、坚固性系数与应力的关系
Figure 11. Relationship between critical gas pressure, firmness coefficient and stress during outburst
表 1 基础参数
Table 1 Basic parameters
参数 取值 顶底板的弹性模量/GPa 21 顶底板的泊松比 0.40 顶底板的密度/（kg·m−3） 2.5×103 顶底板的黏聚力/ MPa 20 顶底板的内摩擦角/（°） 40 煤体的弹性模量/GPa 2.3 工作面气压/MPa 0.1 煤的泊松比 0.19 煤的传热系数/（W·m−1·K−1） 0.1 煤的密度/（kg·m−3） 1.41×103 煤层初始孔隙率/% 5.61 煤的黏聚力/MPa 20 煤的内摩擦角/（°） 40 气体动力黏度系数/（Pa·s） 11.124 气体的密度/（kg·m−3） 0.716 初始气体压力/MPa 0.50 煤体的初始温度/K 304.4 煤的渗透率/m2 3.1×10−12 
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