特殊地形条件下烟囱拆除爆破地震效应测试与分析

Monitoring and Analysis of Seismic Effects of Chimney Blasting Demolition Locating at the Special Terrain

结合2个特殊地形条件下的烟囱拆除爆破工程实例,进行了爆破地震效应监测与分析。重点分析了陡壁台阶和山坡地形对烟囱拆除爆破地震效应的影响情况,得出了位于2种特殊地形情况下烟囱拆除爆破地震效应的一般结论。通过对实测振动信号和数据分析比较,发现烟囱拆除爆破地震效应不仅与爆破方案、爆源距离有关,还与烟囱倾倒方向上的场地条件和地震波传播路径上的地形条件等因素有关,并且烟囱触地振动强度不一定比爆破时振动强度大。

According to two engineering examples of chimney blasting demolition under the special terrain condition. The paper monitors and analyses the seismic effects of the examples. And emphatically analyses the seismic effects status of chimney blasting demolition, which locates at steep sidestep and slope. At last, the ecumenical conclusion of seismic effects on chimney blasting demolishment, which locates at the two special terrain plight, is drawn. After analyzing and comparing the measured vibration signals and data, we can find that the seismic effects of chimney blasting demolition is not only related with blasting project, distance from the vibration source, but also related with the ground conditions in the direction of chimney collapsing and the terrain plight of blasting areas in the direction of seismic wave spread etc. What is more, the intensity of the touchdown vibration of chimney blasting is not always larger than the vibration caused by blasting.