在第四系中更新统洪积粘土层中进行了现场试验研究，在8.5～12.5m的埋深范围内爆扩成型9个无衬砌腔体。装药量在15～51kg，成腔容积在5～20m3。针对计算土中爆炸成腔半径的半经验公式，给出适用于不同炸药的比例系数及其换算公式。%On-Site experimients are carried out in mid Pleistocene series diluvial clay blanket of Quaternary system. Nine of no-lining cavity are explosive enlarged in the depth of 8.5～12.5m. The explosive charges are at the weight of 15～51kg. The explosive cavities are at the capacity of 5～20m3. Against the semi-rational calculation formulas on radius of explosive cavity in soil, the proportion factors suitable for different explosives and their reduction formula are put forward.
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