Application of surface nuclear magnetic resonance technology in detecting water abundance in concealed burnt zone
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摘要: 煤层隐伏火烧区上覆基岩复合含水层(包括风化基岩和烧变岩含水层)是煤层开采的主要威胁之一, 明确隐伏火烧区的富水性对矿井水害防治具有重要意义。基于此, 以发生过较大突水事故的柠条塔煤矿为研究对象, 利用地面核磁共振(SNMR)技术开展隐伏火烧区含水层富水性探测并对其进行分析和验证。结果表明, 隐伏火烧区共有2个含水层位, 分别为第四系松散砂层含水层和1-2 上煤上覆基岩含水层; 第四系砂层含水层富水性受地表地形及其下隔水层顶部起伏形态影响水平变化较大; 1-2 上煤上覆基岩含水层富水性总体西南较低、北东较高, 该含水层厚度9~30 m, 局部相对较厚, 推测为1-2 上煤火烧区风化基岩和烧变岩含水层的叠加反映; 研究区内1-2 上煤上覆基岩含水层总体呈现出西部及中部偏东南区域富水性相对较大, 其余区域富水性相对较小。利用SNMR得到的含水层富水程度与探放水孔及水文孔的涌水量结果大致相同, 表明该方法的勘探结果相对可靠, 可用于隐伏火烧区富水性的探测。Abstract: The overlying bedrock composite aquifer(including weathered bedrock and burnt rock aquifer) in the concealed burnt zone of coal seams is one of the main threats to coal mining. It is of great significance to clarify the water enrichment of the concealed burnt zone for the prevention and control of coal mine water hazards. Ningtiaota Coal Mine, which has experienced a large water inrush accident, was used as the research object, and the Surface Nuclear Magnetic Resonance(SNMR) was used to detect the water enrichment of the aquifer in the concealed burnt area. The results show that there are two aquifers in the concealed burnt zone, namely Quaternary loose sand aquifer and 1-2 coal overlying bedrock aquifer. The water enrichment of the Quaternary sand aquifer is affected by the topography of the surface and the top undulating shape of the lower aquifer, and the level changes greatly. The water content of the bedrock aquifer overlying 1-2 coal is generally lower in the southwest and higher in the northeast. The thickness of the aquifer is 9-30 m, relatively thicker parts, which is presumed to be the superimposed reflection of weathered bedrock and burnt rock aquifer in the burnt area. In the study area, the overlying bedrock aquifer of 1-2 coal generally shows relatively larger water quantity in the western and central southeast regions and relatively weaker water abundance. The conclusions obtained by using SNMR are roughly the same as the results of water inflows from water detection holes and hydrological holes, which indicates that the exploration results of this method are relatively reliable and can be used for the detection of water enrichment in hidden burnt areas.
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图 7 研究区1-2 上煤上覆基岩含水层水文地质参数
Fig. 7 Hydrogeological map of the 1-2 coal overlying bedrock aquifer in the study area
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图 8 S1233工作面井下探放水钻孔分布
Fig. 8 Boreholes layout of underground exploration and drilling in working face S1233
表 1 S1233工作面井下探放水钻孔涌水量
Table 1 Water gushing by underground water exploration and drilling in working face S1233
编号 孔号 孔深/
m涌水量/
(m3·h-1)编号 孔号 孔深/
m涌水量/
(m3·h-1)1 Y3-1 134 27.7 7 X7-1 84 13 Y3-2 127 14.4 X7-2 82.5 10 Y3-3 132 20 X7-3 81.5 18 2 X4-1 127 30 X7-4 66 6 X4-2 123 16 8 X8-1 142 54 X4-3 130 95 X8-2 136 27 X4-4 129 30 X8-3 93 130 3 F1 127.5 31 X8-4 89 108 F2 102 25 9 X9-1 126 50.4 F3 108 48 X9-2 120 45.8 F4 126 51 X9-3 120 77.1 4 F5 129 77 X9-4 128 90 F6 111 24 10 X10-1 123 24 F7 109 25 X10-2 120 40 F8 123 23 X10-3 125 20 5 X5-1 129 13 X10-4 126 144 X5-2 123 18 11 X11-1 125 33 X5-3 126 46 X11-2 122 14 X5-4 138 56 X11-3 123 35 6 X6-1 121 15 X11-4 133 58 X6-2 123 70 X6-3 97 25 X6-4 93 50 
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