长壁逐巷胶结充填巷道复合承载体支护研究
Research on support of composite bearing body in longwall-roadway cemented backfilling
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摘要: 长壁逐巷胶结充填开采过程中充填巷道的支护效率极大地影响了掘巷速度，为了简化回采过程中充填巷道两侧处于煤体-煤体、充填体-煤体、充填体-充填体围岩动态组合时的支护，通过数值模拟得出单个开采循环内煤体和充填体的应力演化规律，针对充填巷道周围煤与充填体的不同复合承载特点，设计了3种支护方案，并分析了支护效果。结果表明，单个开采循环内的不同阶段煤体都为复合承载体系中的主要承载部分，其垂直应力最大可达34.4 MPa，应力集中系数为2.33；充填体垂直应力变化范围约为0.5~2.13 MPa，变化幅度小；在掘进过程中减少对充填体侧的支护时，处于3种状态的充填巷道断面收缩率分别为2.84%、4.38%、13.33%，即单个开采循环中存在煤体-充填体复合承载时减少支护对巷道变形影响较小。
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关键词:
- 长壁逐巷开采 /
- 煤体-充填体复合承载 /
- 数值模拟 /
- 应力演化 /
- 巷道支护
Abstract: The supporting efficiency of the filling roadway during longwall-roadway cemented backfilling process greatly affects the speed of roadway driving. In order to simplify the support during the mining process when both sides of the filling roadway are in the dynamic combination of coal body-coal body, filler-coal body, and filler-filler surrounding rock, this paper uses numerical simulation to obtain the stress evolution law of the coal and the backfill in a single mining cycle. According to the different composite bearing characteristics of the coal and the filling body around the filling roadway, three supporting schemes are designed and the supporting effect is analyzed. It is found that at different stages of a single mining cycle, the coal body is the main bearing part of the composite load-bearing system, with the maximum vertical stress of 34.4 MPa and the stress concentration coefficient of 2.33. The vertical stress range of the filler is about 0.5 MPa to 2.13 MPa, and the change range is small. In the process of tunneling, when the support on the side of the filling body is reduced, the section shrinkage rate of the filling roadway in the three states is 2.84%, 4.38% and 13.33%, respectively. In other words, the reduced support has little influence on the roadway deformation when the coal-filling body compound bearing capacity exists in a single mining cycle. -
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