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深孔爆破技术在高地应力低透气性高瓦斯煤层增透防突中的适用性
引用本文:赵宝友,王海东.深孔爆破技术在高地应力低透气性高瓦斯煤层增透防突中的适用性[J].爆炸与冲击,2014,34(2):145-152.
作者姓名:赵宝友  王海东
作者单位:1.辽宁工程技术大学力学与工程学院,辽宁 阜新123000
基金项目:国家自然科学基金项目(51304109,51204086);辽宁工程技术大学校基金项目(2010115,2011188);
高等学校博士学科点专项科研基金项目(20112121120004)
摘    要:同时考虑爆炸波、爆生气体、煤层原始瓦斯压力和煤层地应力的作用,对不同地应力条件下的高瓦斯低透气性煤层深孔爆破进行了有限差分动力数值模拟,并与室内相似模型实验和相关现场实践进行了对比。结果表明:地应力对煤层深孔爆破效果的影响显著,尤其对于高地应力煤层,地应力严重抑制着煤层爆生裂隙的扩展,煤层爆生裂隙半径随地应力的增大而近线性地减小,但深孔爆破技术对于高应力低透气性煤层仍可取得良好的增透效果;煤层地应力的主应力方向在一定程度上影响着爆生裂隙的扩展方向,实际工程需结合煤层地应力状况来布置爆破孔的空间位置。

关 键 词:爆炸力学    爆生裂隙    深孔爆破    高应力低透气性煤层    煤层地应力    爆生气体
收稿时间:2012-09-03

Feasibility of deep-hole blasting technology for outburst prevention and permeability enhancement in high-gas-content coal seams with low-permeability subjected to high geo-stresses
Institution:1.College of Mechanics and Engineering, Liaoning Technical University, Fuxin 123000, Liaoning, China2.State Key Laboratory of Coal Mine Safety Technology, Shenyang Research Institute, China Coal Technology & Engineering Group Corp, Shenyang110016, Liaoning, China
Abstract:Byconsideringtheactionofblastingwave,explosion-inducedgasandinitialgaspressureas wellasgeo-stressenduredbycoalseamsimultaneously,thedeep-holeblastinginlow-permeability high-gas-contentcoalseamsunderdifferentgeo-stresseswerenumericallysimulatedbyusingthe FLAC3Dcode.Andthesimulatedresultswerecomparedwiththelaboratorymodeltestandotherrelatedfieldstudiesonthepermeabilityimprovementofthelow- permeabilitycoalseams.Thecomparableanalysisindicatesthatthegeo- stresscandramaticallyinhibittheextensionoftheblast-induced cracksinthecoalseams,especiallyforthedeeply-buriedcoalseams.Thoughtheradiusoftheblastingcrackzoneslinearlydecreaseswiththeincreasingofgeo- stress,theblastingtechniquecanalsobe adaptedtoenhancethepermeabilityofthedeeply-buriedlow-permeabilitycoalseams.Andthedirectionofthemaximumgeo- stresscanaffecttheextensiondirectionoftheblast-inducedcracksinsome degree.Therefore,inapracticalblastingengineering,thespatiallocationoftheblastholesshouldbe determinedaccordingtothestateofthegeo-stressenduredbythecoalseam.
Keywords:mechanicsofexplosion  blast-inducedcrack  deep-holeblasting\low-permeabilitycoal
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seamssubjectedtohighgeo-stresses
  geo-stressenduredbycoalseam  explosion-inducedgas
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