The calculation formula for the spread foundation height is not offered in Code for Design of Building Foundation(GB50007—2002).
《建筑地基基础设计规范》（GB50007—2002）扩展基础设计中没有给出具体的基础高度的计算公式。
A simplified model for directional collapse of a construction is presented and a calculation formula on the minimum height of blasting cut is developed.
对建筑物的定向倾倒提出了简化模型，推导了最小炸高的计算公式。
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