研究表明，在连续级配碎石、砂砾、石灰稳定土、石屑几种回填材料中以自然级配砂砾石为最佳台背回填材料。
According to the research, the natural graded gravel is the best backfill material of graded crushed stone, grit, lime stabilized soil and rock chips.
这种废石或碎石的行为与洁净的砂石或砾石相类似。
The behaviour of this waste or broken rock is similar to that of a clean sand or gravel.
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