中文摘要：

为了确保底板治水工作的连续性，并有效降低巷道掘进率、提高资源回收率．城郊煤矿21304工作面采用了切顶卸压沿空留巷无煤柱开采技术。以城郊煤矿21304工作面为研究背景，通过工程经验和现场实验的方法，对双向聚能拉伸爆破参数进行了研究。现场试验结果表明：4＋3＋2＋0装药方式下，孔内裂缝明显、充分，裂缝率达到了86％，且工作面回采后顶板沿裂缝面及时垮落，现场应用效果良好。

英文摘要：

To ensure the continuity of the mine water prevention and control, reduce the rate of roadway excavation, and improve resource recovery, retaining a lane by cutting root for next sublevel technology was applied in 21304 mining face in Chengjiao coal mine. The energy-gathered blasting parameter was studied by engineering experience and field experiment. The results show that 4＋3＋2＋0 explosive filling mode worked well. The crack rate in the blasting hole reached 86%, and the roof rock masses could collapse in time.