煤体坚固性系数和瓦斯压力对煤层深孔爆破增透的影响  

Impact of Coal Strength Coefficient and Methane Gas Pressure on Permeability Enhancement of Coal Seam Induced by Long-hole Blasting Technology

作　　者：赵宝友[1] 王海东[2,3] 

机构地区：[1]辽宁工程技术大学力学与工程学院,阜新123000 [2]煤炭科学研究总院沈阳研究院,沈阳110016 [3]煤炭科学研究总院煤矿安全技术国家重点实验室,沈阳110016

出　　处：《爆破》2014年第1期25-31,共7页Blasting

基　　金：国家自然科学基金青年科学基金项目(51304109);高等学校博士学科点专项科研基金新教师类资助项目(20112121120004);辽宁工程技术大学校基金资助项目(2010115;2011188)

摘　　要：基于FLAC 3D有限差分动力数值模拟及与室内实验和典型现场试验结果对比分析的方法,研究了煤层的瓦斯压力和坚固系数对高应力低透气性高瓦斯煤层深孔爆破增透效果的影响。有限差分动力数值模拟中,通过FISH语言的二次开发,同时考虑了煤层地应力、爆炸波时程、爆生气体时程的作用,且与以往煤体爆破裂纹扩展数值模拟不同的是,爆生气体时程不仅作用在炮孔壁处,还作用在裂纹表面之上。研究结果表明:煤层裂隙区随煤体坚固性系数的增大呈对数关系增大;煤层瓦斯压力的存在降低了煤体的有效强度,有利于煤层爆生裂纹的扩展;煤体坚固性系数和煤层瓦斯压力对煤层深孔爆破增透均呈现正效应的影响。On the basis of dynamic numerical simulation, the influence of coal stiffness and coal seam gas pres- sure on the permeability enhancement of high stress and low permeability coal seam by long-hole blasting technique was studied, and the results were also compared with the laboratory test and field application. The actions of geo- stress, coal seam gas pressure, blasting stress wave and explosion gas pressure were considered simultaneously in nu- merical simulation. The explosion gas was applied not only on borehole surface but on crack surface by using FISH language, which was entirely distinguished from former numerical simulation on crack growth induced by blasting. The results indicated that the stiffness of coal seam dramatically affected the extension of coal seam crack zone, and the crack zone exponentially increased with the increasing of coal seam firmness coefficient. The results also showed that the coal seam gas pressure was helpful to the crack extension, and the blasting technique could enhance the permea- bility of deeply buried and lowly permeable coal seam.

关 键 词：煤体坚固性系数 瓦斯压力 深孔爆破 爆炸波 爆生气体 

分 类 号：TD235[矿业工程—矿井建设] TD713