In order to improve the gradation and the quality of the filtering material, both sieved and blasted materials are used.And the quantity of gravel mined decreased. 根據料場(chǎng)砂礫石級配特點(diǎn)和反濾設計要求，綜合利用篩分料和爆破料改善反濾料的級配，進(jìn)而提高反濾料的質(zhì)量，同時(shí)減少反濾料的開(kāi)采量。
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