锯齿状停采线煤柱诱发冲击危险的反演研究
Inversion Study on Rock Burst Danger Induced by Serrated Stopping Line Coal Pillar
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摘要: 针对三河尖煤矿冲击矿压类型，运用震动波CT探测技术反演了锯齿状停采线煤柱区域波速分布，根据震动波CT技术指标波速异常系数An和波速梯度变化系数VG的判别准则，判断了锯齿状停采线煤柱区域的应力集中特征、弱化特征和危险性特征。研究结果表明：锯齿状停采线煤柱附近应力集中区的波速正异常系数An约为14%，应力集中特征为弱；弱化区的波速负异常系数An约为18%，弱化特征为中等；冲击危险区的 异常系数约为11%，危险性特征为弱。最后采用针对性卸压措施，保证了巷道掘进和工作面的安全回采。Abstract: According to the type of rock burst in Sanhejian Mine, velocity distribution in coal pillar region of the serrated stopping line was inversed through seismic computed tomography detection technology. Characteristics of stress concentration, weakening level and hazard level in coal pillar region of the serrated stopping line was estimated according to the criterion of seismic computed tomography detection technology, which contains assessment parameters of wave velocity anomaly An and wave velocity gradient anomaly VG. The results show that micro-seismic energy in coal pillar region of the serrated stopping line accounted for 60.2% of the micro-seismic energy in mining area; in coal pillar region of the serrated stopping line, positive anomaly An of wave speed was about 14%, characteristic of stress concentration was weak, negative anomaly An of wave speed was about 18%, weakening level was medium, value was about 11%, hazard level was weaken. Finally, we use targeted pressure relief measures to avoid the stress concentration phenomenon in coal pillar region of the serrated stopping line, and the safety of the working face of mining and extraction was ensured.
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Keywords:
- rock burst /
- stopping line coal pillar /
- seismic computed tomography /
- wave velocity /
- inversion
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