针对烟囱定向爆破产生的强大冲击振动效应以及防护主要依据工程经验的现状,土垫层厚度计算0显得尤为重要.应用Winkler弹性地基模型,基于接触力学理论计算钢筋砼烟囱定向爆破触地冲击力,进而结合地面破坏规律推导出土垫层厚度的计算公式,并采用相关文献实例进行验证.结果表明采用二次曲线模拟接触区域更符合实际情况,计算结果较保守、偏于安全.因此,该公式对烟囱定向爆破防护具有一定的指导意义.%The calculation of soil cushion thickness is of great importance for the phenomenon that the strong shock and vibration effects as well as protection produced by directional blasting of chimney are mainly based on engineering experience. In this paper, impulsive force of reinforced concrete chimney caused in directional blasting is calculated based on Winkler's elastic foundation model,thus the calculation formula of cushion thickness is derived from land surface failure law and verified by related literature examples. The results show that contact area simulated by conic simulation accords closer with the practical situation and the calculation results are more conservative and safer. Therefore, this formula is of guidance significance to directional blasting protection of chimney.
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