巷道塑性区和煤与瓦斯突出孔洞关系
Relationship between plastic zone of roadway and coal and gas outburst hole
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摘要: 突出孔洞对于研究煤与瓦斯突出机理有重要意义。通过数值模拟，得到突出煤巷掘进头处煤体塑性区，并将其与实际突出孔洞进行对比；分析比较了不同地应力条件下巷道掘进头处塑性区的范围。研究表明：巷道掘进面前方塑性区尺寸随着双向主应力比值的增加而增大，并且增长幅度呈增大趋势；不同的双向主应力比值导致巷道围岩出现不同大小范围的塑性区；当双向主应力比值较大，塑性区范围随着主应力方向的不同呈现明显差异；实际突出巷道掘进头处煤体塑性区与巷道突出孔洞在形态和位置上均有相当的一致性，巷道突出孔洞是由巷道掘进头处煤体塑性区演化、发展而来的；不同地应力条件下巷道掘进头处煤体塑性区的尺寸，可以作为煤与瓦斯突出强度分析的一个指标。Abstract: The outburst hole is of great significance to study the mechanism of coal and gas outburst. Through numerical simulation, the plastic zone of coal body at the excavation head of outburst roadway is obtained and compared with the actual outburst holes. The range of the excavation head of roadway under different in-situ stress conditions is analyzed and compared. The results show that the size of plastic zone increases with the increase of the ratio of bidirectional principal stress in front of roadway excavation, and the increasing range shows an increasing trend. Different bidirectional principal stress ratios lead to different plastic zones in surrounding rock. When the ratio of bidirectional principal stress is large, the range of plastic zone is obviously different with the direction of principal stress. The plastic zone of coal at the excavation head of roadway outburst is quite consistent with the actual hole of roadway outburst in shape and position. The coal and gas outburst hole of roadway outburst is evolved and developed from the plastic zone of coal at the excavation head of roadway. The size of plastic zone of coal at the excavation head of roadway under different in-situ stress can be used as an index to analyze the strength of coal and gas outburst.
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Keywords:
- coal and gas outburst /
- outburst hole /
- plastic zone /
- in-situ stress /
- outburst intensity
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