江俐敏,吴育谦,刘存福,周圣国,王智德

• 1:武汉职业技术学院建筑工程学院
• 2:南粤交通怀阳高速公路管理中心
• 3:武汉理工大学土木工程与建筑学院

摘要(Abstract)：

针对目前煤系地层隧道石门揭煤爆破掏槽技术最优参数确定复杂的难题，以西藏拉泽公路圭嘎拉隧道为研究对象，采用理论分析确定该隧道石门揭煤断面掏槽形式采用中空孔直眼掏槽，并分析了其中空孔的三种空孔力学效应；采用数值模拟试验方法建立了隧道石门揭煤直眼掏槽计算模型，从石门揭煤掏槽效率、揭煤深度和煤层动力响应等方面对不同掏槽参数展开分析。结果表明：随着掏槽关键参数a=24 cm增加到a=32 cm时，槽腔岩石破碎程度降低，煤体破碎程度相当，炮孔与空孔间未贯通的岩石厚度增加，降低了掏槽效率；a=28 cm时，局部揭煤深度过大，增大了突出风险；a=32 cm时，煤体深部出现松动区，使深部煤体应力强度降低，不同a对大断面煤系地层隧道石门揭煤煤层顶板动力作用影响较小。并获得了该煤系地层隧道石门揭煤爆破中空孔直眼掏槽掏关键参数最优值，其中炮孔与空孔间距建议值为24 cm、空孔半径建议值为100 mm;最后完成了现场爆破试验，爆破后岩体破碎程度均匀，掏槽效果好，揭煤深度适宜，其测试结果与理论研究成果较接近，验证了研究成果的可靠性。

关键词(KeyWords)： 煤系地层隧道;大断面;石门揭煤爆破;中空孔直眼掏槽;优化设计

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金项目(编号51779197);; 武汉市城乡建设委员会科技计划项目(武城建[2017]12号—201740、武城建[2019]68号—201941);; 武汉职业技术学院2021年校级教科研课题(2021YK016)

作者(Author): 江俐敏,吴育谦,刘存福,周圣国,王智德

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