concussion blasting

With the remote vibration shot,the seam could be safely and rapidly opened.

通过对丁集煤矿煤层突出危险性分析,研究确定了井筒穿过具有突出危险性煤层时通过地面预注浆进行固化煤层,降低煤层的孔隙率和瓦斯放散初速度,提高煤体强度,使煤体不具有突出危险性,再用远距离震动放炮方法安全快速揭开煤层。

When advancing and uncovering coal in roadway, better construction method is vibration shot, metal framework, borehole bleed-off and hydraulic hole, of which vibration shot is principal.

井巷掘进揭煤时,较好的施工方法是震动放炮,金属骨架,钻孔排放和水力冲孔,尤以震动放炮为主。

Because of ground object influences,the theoretical transformation of shotpoint (restoring shooting) can only be a remedial measure during 3D seismic data acquisition.

受地物影响,炮点的理论变观方法(恢复性放炮法)只能是三维地震数据采集过程中的一种补救措施而已,它只保证了设计覆盖次数不变的目的,而不能保证道集内炮检距和方位角不变的目的。

Relationship between anxiety and explosive hearing injury;

炮震性听力损害与焦虑情绪的关系分析