深井超高水充填工作面小煤柱稳定性规律及控制技术
Stability law and control technology of small coal pillar in super high water backfilling face with deep mining depth
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摘要: 为了探究充填工作面合理煤柱尺寸，以山东义能煤矿为工程背景，构建了“充填体-煤柱-充填体”结构力学模型；通过研究不同煤柱尺寸内部破坏状况确定损伤程度，提出了煤柱承载分尺寸分区分级特征；利用UDEC软件模拟分析了10、6、3、1 m宽度煤柱的竖向应力大小、塑性区发育及变形特征。结果表明：随煤柱宽度减小，竖向应力递减最小至16.5 MPa，塑性区范围不断增大，煤柱变形不断增大。按照煤柱应力与变形特征“象限法”探究了不同宽度煤柱稳定性，并结合安全、经济等因素，确定了超高水充填开采条件下小煤柱合理宽度为3 m；提出通过锚杆锚网联合支护及煤柱注浆封堵技术控制煤柱稳定性，设计了注浆流程、材料、时机、压力等参数，为深井充填工作面安全高效开采提供有效保障。Abstract: In order to explore the reasonable coal pillar size of the backfilling working face, taking Shandong Yineng Coal Mine as the engineering background, a structural mechanics model of “backfilling body-coal pillar-backfilling body” was constructed. The damage level is determined by studying the internal failure conditions under different sizes of coal pillar, and the bearing characteristics of coal pillar in different sizes, zones and grades are proposed. The vertical stress, plastic development characteristics and deformation of coal pillar at different scales of 10 m, 6 m, 3 m and 1 m are simulated and analyzed by using UDEC software. The simulation shows that the vertical stress distribution decreases with the decrease of width, the minimum reaches 16.5 MPa, the plastic zone increases with the decrease of coal pillar size, the deformation of coal pillar increases with the decrease of coal pillar width, and reaches the minimum deformation at the range of 3-6 m; according to the “quadrant method” of coal pillar stress and deformation characteristics, the coal pillars stability of different widths was explored. Combined with the safety and economic factors of the mine, the reasonable width of small coal pillar under the conditions of superhigh water backfilling mining is determined to be 3 m. It is proposed to maintain the stability and sealing of small coal pillar by grouting and plugging, anchor bolt and mesh support technology, and determine the grouting process, materials, timing, pressure and other parameters, which could provide an effective guarantee for the safe and high recovery rate for backfilling mining with deep buried depth.
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Keywords:
- deep well /
- backfilling mining /
- coal pillar stability /
- reasonable width /
- grouting plugging
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