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冶金部矿山司于1989年5月15日至16日在张家洼矿山公司主持召开了小官庄铁矿采矿技术攻关汇报会。交流了一年来的工作进展情况,讨论了今后的攻关任务。东区采矿技术攻关该区攻关工作由东北工学院负责。他们完成了18线-250米水平有底柱崩落法的落矿工作,即组织了以182溜井的冒落区及18-1矿块的爆落区为松散体的侧向挤压爆破,这次爆破用炸药量近14t。崩落矿石量近2.5万吨,炸药单耗0.53kg/t。爆破效果良好,不但有效地控制了地压活动,也为20钱无底柱的正常回采创造了有利条件。
Metallurgical Department of Mining Division in May 1989 May 16 to 16 in Zhangjiawa Mining Company held a small iron ore mining technology research briefing. Exchanged the work progress over the past year and discussed the key tasks for the future. Eastern mining technology research in this area to tackle the work by the Northeast Institute of Technology. They finished the work of lowering the floor with a 15-foot-250-foot bottom-line caving method by organizing lateral extrusion blasting of loose bodies in the burst zone of the 182-slip well and the block 18-1 The amount of explosive blasting nearly 14t. Caving ore volume of nearly 25,000 tons, explosive unit consumption 0.53kg / t. The blasting effect is good, which not only effectively controls the ground pressure activities, but also creates favorable conditions for the normal recovery of 20 money without pillars.