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筒+砂質量-剩餘筒+砂質量-椎體砂重=試坑裏的砂質量 試坑裏的砂質量/量砂密度=試坑體積 濕土質量/試坑體積=濕密度 濕密度/(1+含水率%)=幹密度 幹密度/最大幹密度=壓實度 最大幹密度是室內試驗求得的
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