石炭二叠系井田立井奥灰水害探查治理技术

摘要/Abstract

摘要： 塔山煤矿副立井掘进属于带压危险区，为了消除掘进过程中底板奥灰突水的潜在威胁，通过开展钻探设计与施工，分析了副立井水窝底板奥灰含水层钻孔出水情况，然后进行注浆加固治理设计与施工，最后通过注浆前后压水试验，分析治理效果，确保副立井安全。结果表明：设计在井筒30 m范围之内对称均匀布置17个钻孔进行探查，详细分析了钻孔出水量、水压、水温等数据，得出钻孔出水量及吸水率均从井筒西北向东南方向增大，东南部的5个钻孔出水量均大于4 m3/h，说明井筒东南部奥灰含水层富水性大于西北部，裂隙发育东南也较西北强，但除个别钻孔之外，所有钻孔吸水率均低于0.01 L/min?m?m，说明探查区域总体裂隙较不发育；设计采用水泥单液浆，大部分钻孔注浆水灰比为3:1，浆液浓度约为1.2 kg/cm3，东南部部分钻孔可增加水灰比，提高浆液浓度，并进行二次注浆；从注浆量来看，注浆量从西北的钻孔向东南逐步增大，特别时东南的5个钻孔，注浆量达到最大，这与钻孔出水量及吸水率呈现正相关的变化特征；通过压水试验进行治理效果检测，注浆后出水量、吸水率均远小于注浆前，且注浆后吸水率均小于标准值0.01 L/min?m?m，均满足要求的注浆结束标准，表明煤层内裂隙已达到充填加固封堵的作用。

关键词: 石炭二叠系井田, 立井, 奥灰水害, 探查治理, 效果检测

Abstract: The auxiliary shaft tunneling of Tashan Coal Mine belongs to the dangerous zone under pressure. In order to eliminate the potential threat of Ordovician limestone water inrush from the floor during the tunneling process, the water outflow from the borehole of the Ordovician limestone aquifer at the floor of the auxiliary shaft's sump floor are analyzed through drilling design and construction, and then the design and construction of grouting reinforcement is carried out. Finally through the water pressure test before and after grouting to analyze the treatment effect to ensure the safety of the auxiliary shaft. The results show that 17 boreholes are symmetrically and evenly arranged within 30m of the shaft for exploration. The data of borehole water yield, water pressure and water temperature are analyzed in detail. It is concluded that the borehole water yield and water absorption increase from northwest to Southeast, and the water yield of five boreholes in the southeast is greater than 4 m3 / h, indicating that the water yield of Ordovician limestone aquifer in the southeast of the shaft is greater than that in the northwest, and the fracture development in the southeast is stronger than that in the northwest, but except for some boreholes, The water absorption of all boreholes is lower than 0.01 L/min?m?m, indicating that the overall fractures in the exploration area are not developed;The design adopts cement single liquid slurry. The water cement ratio of most boreholes is 3:1, and the slurry concentration is about 1.2 kg / cm3. Some boreholes in the southeast can increase the water cement ratio, improve the slurry concentration, and carry out secondary grouting;From the perspective of grouting volume, the grouting volume gradually increases from the boreholes in the northwest to the southeast. Especially in the five boreholes in the southeast, the grouting volume reaches the maximum, which is positively related to the water yield and water absorption of the boreholes;Through the water pressure test to detect the treatment effect, the water yield and water absorption after grouting are far less than those before grouting, and the water absorption after grouting is less than the standard value of 0.01 L/min?m?m, which meet the required grouting completion standard, indicating that the cracks in the coal seam have reached the role of filling, reinforcement and plugging.

Key words: Carboniferous Permian wellfield, vertical shaft, Ordovician limestone water damage, exploration and treatment, effect detection

罗安清牟义. 石炭二叠系井田立井奥灰水害探查治理技术[J]. 煤炭工程, 2023, (6): 0-0.

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