According to the theory on stock column skeleton of BF and the economic analysis of injection, a new concept on limit of injected coal and critical replacement ratio is proposed.
根据料柱骨架理论和喷煤技术经济分析，提出了高炉喷煤极限和临界置换比的新概念；
It is found that the load critical depth and the friction range increase while the cap breadth increases with the same replacement ratio.
发现置换率相同时，承台板宽度大，水泥土桩的荷载临界深度也大，桩侧摩阻力分布深度下移。
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