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首页> 美国卫生研究院文献>PLoS Clinical Trials >Permeability enhancement of deep hole pre-splitting blasting in the low permeability coal seam of the Nanting coal mine
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Permeability enhancement of deep hole pre-splitting blasting in the low permeability coal seam of the Nanting coal mine

机译：南亭煤矿低渗透煤层深孔预裂爆破的渗透性提高

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To solve the hidden danger of high methane and low permeability gas in the coal mining process, potentially affecting the safety production in an orderly way, we propose the use of deep hole blasting technology to improve the permeability of the coal seam gas drainage, increase the quantity and rate of extraction, and reduce methane output. Taking the geological conditions of the 201 working surface of Tingnan Coal Mine as an example, it is calculated that the single drilled fracture crack extension range is 3.11~5.24 m according to the coal seam deep-hole pre-splitting blasting joint mechanism and fracture propagation mechanics model, providing a theoretical basis for choosing the appropriate hole spacing. Using COMSOL simulation software to simulate the effective gas drainage radius of a coal seam from a two-dimensional perspective on a single borehole radial, the least squares fitting method was used to analyze the simulated data, and obtained the effective drilling extraction radius after pre-split blasting in a deep hole that is 3.6 m, which is in accordance with the theoretical calculations. In order to obtain accurate and scientific calculations, Fast lagrangian analysis of continua (FLAC3D) numerical simulation software was used. After simulating the distribution of plastic zone between two blast holes at different intervals from a three-dimensional angle, and evaluating the development of cracks in the blasting hole, the white zone of the blasting space was completely eliminated when the interval between blasting holes was 7 m, and the cracks could be propagated throughout the surroundings. Therefore, a blasting hole spacing of 7 m is optimal. On-site monitoring in the Nanting coal mine showed that the quantity and rate of extraction of the single hole after pre-splitting blasting were 2.36 times and 1.62 times as much as before. By integrating the borehole drainage amount and the optimized calculation equation, it could be concluded that the permeability coefficient of the coal seam after blasting was 7.78 times as much as before. The function of time-variated drilling methane emission was obtained using multivariate statistical regressions based on the on-site monitored borehole methane emission (qt), and the drilling limit after pre-splitting blasting revealed that the limitation of methane extraction volume was 5.27 times as much as before.
机译：为解决煤矿开采过程中高甲烷低渗瓦斯的隐患，有序地影响安全生产，建议采用深孔爆破技术，提高煤层瓦斯抽放的渗透率，增加瓦斯抽采量。数量和提取速率，减少甲烷产量。以亭南煤矿201工作面的地质条件为例，根据煤层深孔预裂爆破联合机理及裂缝扩展，计算得出单钻裂缝裂缝扩展范围为3.11〜5.24 m。力学模型，为选择合适的孔距提供理论依据。使用COMSOL仿真软件在单个井眼径向上从二维角度模拟煤层的有效瓦斯抽采半径，使用最小二乘拟合法对模拟数据进行分析，并获得预采后的有效钻探抽采半径。根据理论计算，在深3.6 m的深孔中进行分次爆破。为了获得准确和科学的计算结果，使用了连续性快速拉格朗日分析（FLAC3D）数值模拟软件。从三维角度模拟了两个间隔不同间隔的喷砂孔之间的塑性区分布，并评估了喷砂孔中裂纹的发展，当喷孔间距为7时，喷砂空间的白色区域被完全消除。 m，并且裂缝可能传播到整个环境。因此，喷孔间距最好为7 m。南亭煤矿现场监测表明，预裂爆破后单孔抽采的数量和速度分别是以前的2.36倍和1.62倍。综合钻孔排量和优化计算公式，可以得出爆破后煤层的渗透系数是以前的7.78倍。基于现场监测的井壁甲烷排放量（qt），通过多元统计回归获得随时间变化的钻井甲烷排放量函数，预裂爆破后的钻井极限表明，甲烷抽采量的限制为5.27倍。和以前一样

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