立井冻土段爆破掘进施工  

Blasting Excavation in Freezing Section of Mine Shaft

作　　者：杨俊杰[1] 马芹永[1] 王书敏[2] 

机构地区：[1]淮南矿业学院 [2]淮北矿务局工程处

出　　处：《煤炭科学技术》1997年第4期1-4,共4页Coal Science and Technology

摘　　要：从鹿洼主井冻土爆破掘进的工程实践，总结了防止冻结管断裂以及冻土爆破方法的经验。The main shaft of Luwa Coal Mine has a net diameter of 4 5 m and an overburden with a thickness of 288 9 m The mine shaft was sunk with a freezing shaft sinking method with a freezing depth of 320 m The temperature of the shaft wall was 9℃ and due to a high strength of the freezed soil, the shaft was excavated with a blasting method According to the measurement, there was a distance of 1 9 m between the freezing tube to the incomplete diameter ( 6 1 m ) of the mine shaft The blasting bore holes were drilled with YT-24 rock drill and 1 2 kw coal drill A depth of a cut hole was 1 2 m and a depth of a blasting hole was 1 m The space between the side holes should not be over 550 mm The blasting bore hole was reverse loaded with No 2 rock explosive Each cycle was arranged with 85 blasting bore holes with explosives of 20 85 kg The blasting operation was a full face blasting which could have following blasting results: An utilization rate of the bore holes was 90 % Each blasting cycle had an advanced rate of 0 9 m Each cubic meter of freezed soil had a explosives and detonator consumption of 0 8 kg and 3 23 detonators Each meter depth excavation of the mine shaft had a consumption of explosive of 23 2 kg A freezed blasting should have a shallow bore hole, less explosive loading, small blasting and always taking care of the freezing tube safety To prevent the tube breaking and failure, the following measures weremade: a red writing note on a board with a distance and location of the freezing tube, the side bore holes all with a vertical depth and the explosive loading control of side bore holes with individual loading of 150 g

关 键 词：冻结法凿井 冻土 爆破 掘进 竖井井筒 

分 类 号：TD262.11[矿业工程—矿井建设] TD265.34