建筑物定向倒塌爆破切口深度的探讨

Study on Blasting Cut Depth for Directional Collapsing of Building

文章对建筑物爆破拆除定向倒塌减小切口深度的可行性及意义进行了探讨，分析了在此种情况下的炸高合理取值范围。研究发现切口深度减小后，增大了支撑部分面积，减小了楼体后坐的可能性；增大了楼体倾倒触地的速度；扩大了单向倾倒方式的使用范围，由通常高宽比H0／L≥√2的楼房变成了H0／L≥1．1的楼房；同时可降低钻爆、防护的工作量，提高了施工效率。实例证明，爆破拆除楼房时，合理地减小切口深度具有一定的使用价值。

The feasibility and significance of reducing the cut depth for building directional blasting and demolishing were discussed in this paper, and the reasonable range of height of burst under this condition was analyzed. The research found that reducing the cut depth can reduce drilling-and-blasting and shielding works, raise the construction efficiency and speed up the construction progress, and at the same time, enlarge the part of area of support and reduce the possibility of the building recoil. The speed of the building toppling down to the ground was raised. The method expands the scope of application of directional falling, the ratio of height to width of the building by the common H0/L≥√2 was changed into H0/L≥1. 1. The example proved that reducing cut-depth for demolishing building based on blasting method is applicable.