Optimization calculation of the width of waterproof coal pillars in fault zones based on spatial relationship between coal strata and fault
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摘要: 近断层煤层开采时，防隔水煤岩柱的正确留设是防止断层突水事故的重要措施。山东济宁三号煤矿123上01(南)工作面西邻的F8断层落差较大，可能会沟通底部奥陶系灰岩(简称奥灰)含水层，为确保工作面安全回采，需要进行F8断层防隔水煤岩柱尺寸计算。考虑煤岩层真实产状、断层面与煤层产状的空间关系和底板承压水威胁，对《煤矿防治水细则》中断层导水条件下的防隔水煤岩柱尺寸计算方式进行改进，推导出水位到安全防隔水煤岩柱宽度(Ha)在断层面垂足处的水头高度计算公式及改进后的断层防隔水煤岩柱尺寸计算公式。对比计算结果发现：《煤矿防治水细则》原有计算公式在将煤岩层理想化为水平岩层，且取偏小的煤层底板水压值计算的情况下，计算出的F8断层煤岩柱尺寸为112 m，改进公式的计算结果为128.5 m。因改进公式考虑了实际煤岩层产状及与断层面空间关系，且水压取值位置准确，计算结果更为精确，将为矿井安全回采提供更为科学的参考依据。Abstract: The appropriate setting width of the waterproof coal pillars is an important measure to prevent water inrush hazard during near fault mining. The working face 123up01(south) of Jining No.3 Coal Mine in Shandong Province is adjacent to F8 fault in the west. The fall of F8 fault is large, which may be conducted with the Ordovician limestone aquifer at the bottom. To ensure the safe mining in the working face, it is necessary to calculate the size of waterproof coal pillars of fault F8. In view of the actual occurrence of coal strata, the spatial relationship between fault plane and coal seam occurrence, and the threat of water inrush caused by the confined water under the coal seam floor, the method to calculate the waterproof coal pillar size of water-conducting faults in Detailed Rules for Water Prevention and Control in Coal Mines was improved, and the formula of the head height from the water level to Ha at the vertical foot of the fault plane and the improved formula of waterproof coal pillar size were deduced. By comparing the calculation results before and after improvement, it is found that the original calculation formula in Detailed Rules for Water Prevention and Control in Coal Mines idealizes the coal strata as horizontal strata, and takes the smaller water pressure value of coal floors, the coal pillar size of F8 fault is calculated as 112 m, while the calculation result of the improved formula is 128.5 m. Since the improved formula takes into account the spatial relationship between the actual occurrence of coal strata and fault plane, and the position where the water pressure value obtained is accurate, so the calculation result is more accurate, which provides a more scientific reference for safe coal mining.
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Key words:
- fault /
- waterproof coal pillar /
- spatial relationship /
- setting width /
- optimization calculation /
- coal mine
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图 1 山东济宁三号煤矿123上01(南)工作面位置
Fig. 1 Location of the 123up01(south) working face of Jining No.3 Coal Mine in Shandong Province
图 2 煤层位于含水层上方且断层导水时防隔水煤(岩)柱留设
Fig. 2 Design of waterproof coal (rock) pillars when the coal seam is located above the aquifer and the fault conducts water
图 3 煤岩层关系三维展示
Fig. 3 Three-dimensional schematic diagram of the coal-rock relationship
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