穿层爆破在南桐矿瓦斯抽放中的应用与数值模拟

›› 2012, Vol. 33 ›› Issue (6): 1822-1828.

穿层爆破在南桐矿瓦斯抽放中的应用与数值模拟

龚敏，文斌，王德胜

北京科技大学土木与环境工程学院，北京 100083

收稿日期:2011-11-27 出版日期:2012-06-11 发布日期:2012-06-14
作者简介:龚敏，男，1963年生，博士，教授，博士生导师，主要从事岩石动力学方面的研究工作

Numerical simulation of blasting through strata for gas drainage in Nantong coal mine and its application

GONG Min，WEN Bin，WANG De-sheng

School of Civil and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China

Received:2011-11-27 Online:2012-06-11 Published:2012-06-14

摘要/Abstract

摘要： 穿层抽放是一些高突矿井常用的瓦斯治理手段，在穿层抽放时采用爆破技术已被证明具有良好的抽放效果。以重庆市南桐矿穿层爆破为背景，建立了穿层深孔爆破数学模型；利用数值计算和现场实测抽放数据相结合的方法，分别研究了各爆破孔、控制孔动应力的变化以及爆破应力场强度与抽放效果的关系。研究结果表明，穿层抽放的特点决定了爆破孔与抽放孔的布孔方式。由于炮孔斜穿煤层，煤层各断面动应力场分布极不均匀，药包中心控制孔所受动应力为控制孔中最大。在南桐矿薄煤层试验条件下，药包长度为3.2 m的爆破孔平均破坏半径为0.57 m，较其他两排炮孔大20%以上。炮孔中药包长度是影响瓦斯抽放量的重要因素。爆破孔的平均单孔抽放量较控制孔高55%，爆破钻场较非爆破钻场平均单孔流量大49%。

关键词: 穿层深孔爆破, 瓦斯抽放, 数值模拟, 动应力分布

Abstract: Gas drainage through strata is usually a way of gas control in outburst coal mine. Blasting in boreholes is useful for gas drainage through strata. Taking the blasting practice of Nantong coal mine as research background, the mathematical models of deep-hole blasting through strata are established. Using numerical simulation and verification test from the coal mine, the changes of dynamic stress are respectively studied for blasting holes and control holes; relations between strength of the stress field and drainage effect after the blasting are discussed. The research result shows that the layout of drainage holes and blast holes is associated with the characteristics of gas drainage crossing layer. Due to the blasting hole inclined cross coal seam, dynamic stress distribution of different coal seam sections is extremely uneven; the dynamic stress of center control hole is the biggest compared with other control holes. Under the condition of thin coal seam in Nantong mine, average value of destruction radius is 0.57 m when the charge length of blasting hole is 3.2 m. This value increases 20% more than that of blasting holes of other rows. Charge length of blast hole is an important factor affecting draining gross of gas. The average of gas drainage volume in blasting holes is 55% larger than that of control holes, and the average single-hole flow of blasting drill field is 49% larger than that of the non-blasting drill field’s.

Key words: deep-hole blasting through strata, gas drainage, numerical simulation, dynamic stress distribution

中图分类号:

O 241

龚敏，文斌，王德胜. 穿层爆破在南桐矿瓦斯抽放中的应用与数值模拟[J]. , 2012, 33(6): 1822-1828.

GONG Min，WEN Bin，WANG De-sheng. Numerical simulation of blasting through strata for gas drainage in Nantong coal mine and its application[J]. , 2012, 33(6): 1822-1828.

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