大采高综采工作面煤壁片帮特征及其稳定性分析

方端宏; 刘盼; 张凤杰

大采高综采工作面煤壁片帮特征及其稳定性分析

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出版历程
- 发布日期: 2013-03-19

Rib Spalling Characters and Its Stability Analysis at Fully Mechanized Caving Face With Great Mining Height

摘要

摘要: 为研究大采高综采工作面的煤壁稳定性，采用2种压杆力学模型分析，得出煤壁的失稳位置离顶板的距离为0.35~0.5倍的采高。然后将片帮的煤体简化为单一滑动面模型，通过力学分析，得到衡量煤壁稳定性的稳定系数K。如果K＞1，即下滑力大于抗滑力，此时发生片帮现象；如果K=1时，此时煤壁处于极限平衡状态；当K＜1时，抗滑力大于下滑力，煤壁稳定。另外由K值的表达式可知，当煤体的内摩擦角和内聚力增大时，煤壁越稳定；当采高和顶板来压增大时，煤壁越易于片帮。通过现场实践分析，注射马丽散等增强煤体的抗剪强度，加强顶板及护帮的支护，加快工作面推进速度，及时移架等措施，有利于减小片帮发生，增强煤壁的稳定性。
- 片帮 /
- 压杆理论 /
- 滑动面 /
- 稳定系数
Abstract: Two kinds of mechanical model are used to analyze coal wall stability of fully mechanized caving face with great mining height, the research shows that instability position of coal wall is away from the roof of 0.35~0.5 times of the mining height. And simplified the spalling coal body into a single sliding surface model, a stability coefficient K is got through the mechanical analysis. if K ＞1, glide force is bigger than resistance and rib spalling happens; if K =1, coal wall is in limit equilibrium state; if K ＜1, this means that wall is stable. In addition, from the expression of K , it concludes that as the greater of the internal frictional angle and cohesion of coal is, the greater stability of the wall is; when mining height and roof pressure increases, the wall is easier to spall. According to the field practice, taking the steps that injecting Malisan to enhance coal shear strength, strengthening the roof and wall's support, speeding up the work-face advance rate, and removing the frame in time and so on could reduce rib spalling and enhance the stability of the coal wall.
- rib spalling /
- pressure bar theory /
- sliding surface /
- stability coefficient

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参考文献(8)

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