高瓦斯工作面预抽分区钻孔精细化设计方法研究
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摘要
现有高瓦斯工作面一般采用单一钻孔间距预抽瓦斯,在预抽钻孔设计时未考虑地质构造等因素对设计抽采区域的影响,且未精确分析抽采达标条件下抽采时间与钻孔间距的相互关系,对工作面回采区域预抽设计没有实现分级、分区的精细化设计。针对以上问题,以霍尔辛赫煤矿3603工作面为研究对象,提出了一种高瓦斯工作面预抽分区钻孔精细化设计方法,改变了以往工作面从终采线到开切眼单一钻孔间距的粗放设计模式。首先根据工作面地质条件对其进行预抽区域划分,由回采计划确定各分区的抽采时间,然后根据不同抽采率条件下抽采时间与钻孔间距之间的数值关系确定各分区的预抽钻孔间距,实现预抽区域精细化设计。现场试验结果表明,相比原设计,钻孔抽采时间由原来的8个月降低至6个月,钻孔工程量由319 440m缩减为154 960m;观测期间整个工作面瓦斯体积分数未超过0.58%,且无超限现象。
At present,single borehole spacing is generally used to pre-drainage gas on high gas working face.But in the design of pre-drainage boreholes,influence of geological structure and other factors on the design of pre-drainage area are not considered,and relationship between extraction time and borehole spacing is also not accurately analyzed under condition of drainage standards.As a result,pre-drainage design of mining area on working face has not realized fine design of classification and zoning.For the above problems,taking 3603 working face of Huoerxinhe Coal Mine as research object,a fine design method of pre-drainage zoning borehole on high gas working face was proposed,which changes the extensive design mode of single borehole spacing from final line to open-off cut.Firstly,according to the geological conditions of the working face,the pre-drainage area is divided,and the extraction time of each area is determined by mining plan.Then,the pre-drainage hole spacing of each zoning area is determined according to the numerical relationship between the extraction time and the borehole spacing under different extraction rates,so as to realize the fine design of the pre-drainage area.The field test results show that compared with the original design,extraction time is reduced from 8 months to 6 months,and borehole engineering quantity is reduced from 319 440 mto 154 960 m;during observation period,the volume fraction of gas concentration on the whole working face does not exceed 0.58%,and there is no over-limit phenomenon.
At present,single borehole spacing is generally used to pre-drainage gas on high gas working face.But in the design of pre-drainage boreholes,influence of geological structure and other factors on the design of pre-drainage area are not considered,and relationship between extraction time and borehole spacing is also not accurately analyzed under condition of drainage standards.As a result,pre-drainage design of mining area on working face has not realized fine design of classification and zoning.For the above problems,taking 3603 working face of Huoerxinhe Coal Mine as research object,a fine design method of pre-drainage zoning borehole on high gas working face was proposed,which changes the extensive design mode of single borehole spacing from final line to open-off cut.Firstly,according to the geological conditions of the working face,the pre-drainage area is divided,and the extraction time of each area is determined by mining plan.Then,the pre-drainage hole spacing of each zoning area is determined according to the numerical relationship between the extraction time and the borehole spacing under different extraction rates,so as to realize the fine design of the pre-drainage area.The field test results show that compared with the original design,extraction time is reduced from 8 months to 6 months,and borehole engineering quantity is reduced from 319 440 mto 154 960 m;during observation period,the volume fraction of gas concentration on the whole working face does not exceed 0.58%,and there is no over-limit phenomenon.
引文
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[2]王奇,张晓涛.顺层钻孔瓦斯抽采半径确定研究[J].能源与环保,2017,39(7):218-221.WANG Qi,ZHANG Xiaotao.Study on determining radius of gas drainage in drill holes along seam[J].China Energy and Environmental Protection,2017,39(7):218-221.
[3]鲁义,申宏敏,秦波涛,等.顺层钻孔瓦斯抽采半径及布孔间距研究[J].采矿与安全工程学报,2015,32(1):156-162LU Yi,SHEN Hongmin,QIN Botao,et al.Gas drainage radius and borehole distance along seam[J].Journal of Mining &Safety Engineering,2015,32(1):156-161.
[4]刘军,王兆丰,李学臣,等.消除矿井瓦斯抽采空白带方法的研究[J].煤炭科学技术,2012,40(12):59-61.LIU Jun,WANG Zhaofeng,LI Xuechen,et al.Study on the methods of eliminating blank zone of mine gas drainage[J].Coal Science and Technology,2012,40(12):59-61.
[5]宜茂生,贾玉良,马家骏.矿井开拓开采计算机辅助设计CAD综合系统的研究[J].煤炭学报,1995,20(增刊1):42-46.
[6]李钢,范喜生,马丕梁,等.基于MATLAB的本煤层瓦斯抽采钻孔间距设计[J].煤矿安全,2011,42(1):35-37.
[7]武磊,戴广龙,杨志磊.顺层钻孔有效抽采半径实验研究[J].煤矿安全,2013,44(5):4-6.WU Lei,DAI Guanglong,YANG Zhilei.Experimental study on effective extraction radius for bedding hole[J].Safety in Coal Mines,2013,44(5):4-6.
[8]李波,孙东辉,张路路.煤矿顺层钻孔瓦斯抽采合理布孔间距研究[J].煤炭科学技术,2016,44(8):121-126.LI Bo,SUN Donghui,ZHANG Lulu.Study on rational space between gas drainage boreholes passing through seam in coal mine[J].Coal Science and Technology,2016,44(8):121-126.
[9]周世宁,林柏泉.煤层瓦斯赋存与流动理论[M].北京:煤炭工业出版社,1999.
[10]梁冰,袁欣鹏,孙维吉,等.分组测压确定瓦斯有效抽采半径试验研究[J].采矿与安全工程学报,2013,30(1):132-135.LIANG Bing,YUAN Xinpeng,SUN Weiji,et al.Grouped pressure test to determine effective gas drainage radius[J].Journal of Mining &Safety Engineering,2013,30(1):132-135.
[11]王宏图,江记记,王再清,等.本煤层单一顺层瓦斯抽采钻孔的渗流场数值模拟[J].重庆大学学报,2011,34(4):24-29.WANG Hongtu,JIANG Jiji,WANG Zaiqing,et al.Numerical simulation of seepage field of gas extraction drilling of single bedding of mining-coal bed[J].Journal of Chongqing University,2011,34(4):24-29.
[12]余陶,卢平,孙金华,等.基于钻孔瓦斯流量和压力测定有效抽采半径[J].采矿与安全工程学报,2012,29(4):596-600.YU Tao,LU Ping,SUN Jinhua,et al.Measurement of effective drainage radius based on gas flow and pressure of boreholes[J].Journal of Mining &Safety Engineering,2012,29(4):596-600.