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(4)擴底(藥壺法) 在六級普通灰岩和半風化灰岩中,岩石很容易用炸藥鬆動,採用藥壺法可使打眼工作量減少,節省炸藥和提高進尺,因为炸藥集中於炮眼底部,若堵塞物加長,可以充分發揮炸藥的威力,消滅留兜現象和減少炮眼角度,增大炮眼的水平距离,工作面的炮眼數可由六个減少至四个,通常炮眼底部擴大变成长2公寸,直徑0.50～1公寸的藥壺,炸藥必須進行改装,每个藥壺裝藥0.60～0.70公斤,每次爆破可以掘進1.20～1.30公尺,如圖9:
(4) Expansion (pot method) In six ordinary limestone and semi-weathered limestone, rocks can easily be loosened with explosives, the use of pot method can reduce the workload of drilling, saving explosives and increase footage, because the concentration of explosives At the bottom of the blast hole, if the blockage is lengthened, the power of the explosive can be fully exerted, the phenomenon of eliminating the stay pocket and the angle of the blast hole can be eliminated, the horizontal distance of the blast hole can be increased, the number of blast holes in the working surface can be reduced from six to four, Growth of 2-inch, diameter 0.50 to 1 inch pot, the explosives must be modified, each charge 0.60 ~ 0.70 kg medicine pot, each blasting can dig 1.20 ~ 1.30 meters, as shown in Figure 9: