预裂爆破在精河下天吉水库边坡开挖中的应用  

Application of Pre-splitting Blasting for Slope Excavation in Xiatianji Reservoir of Jinghe

作　　者：万建江[1] 

机构地区：[1]新疆生产建设兵团第八建筑安装有限责任公司,新疆乌鲁木齐830054

出　　处：《西部探矿工程》2006年第5期127-128,共2页West-China Exploration Engineering

摘　　要：精河县下天吉水库导流、泄洪、排砂洞工程进口明渠右岸边坡开挖。施工钻具为4台KQJ100B型潜孔钻机，马道二层，每层高20m，按马道层数，一次造孔至马道高程，分层、分段往进口明渠内抛掷的施工方法。炸药为20岩石硝氨炸药，分段、导爆索、电雷管引爆。预裂后成果半孔率54％～78％，预裂面平整度不大于20cm，坡比与设计相符，预留马道平台保护层厚度平均60cm，边坡平整度符合规范要求。The right bank slope of entrance open ditch for a diversion, flood-discharge and draining sand tunnel project in Xiatianji reservoir of Jinghe county is excavated. The methods of construction are： four KQT100 B down-the-hole drills are used for drilling instruments; the packway consists two layers; the height of each layer is 20 m; oncethrough borehole making reaches packway＇s altitude; throwing in the direction of entrance open ditch, by layers and sectionally; No. 2 rock ammon-dynamite explosive is used with sectional detonating cord and electric detonator initiation. The achievements after pre-splitting are： half-borehole ratio ranges from 54% to 78%; flatness of pre-splitting face is not greater than 20 cm; the slope agrees with the value of design; the protective layer thickness of preplaced packway platform averages out 60 cm, the flatness of slope is up to the standard demand.

关 键 词：边坡 预裂 梯段 爆破 半孔率 

分 类 号：TD235.371[矿业工程—矿井建设]