| 岩石冲击破坏的流形元与有限元模拟对比分析 |
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| 作者单位： | ;1.北京理工大学;2.北京理工大学;3.北京理工大学 北京100081;4.北京100081 |
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| 摘 要： | 流形元是新出现的一种被较为广泛地应用于材料破坏模拟的数值分析方法。为了验证该方法在材料破坏模拟中的有效性,分别利用流形元与有限元两种不同的数值方法对岩石冲击破坏过程进行了模拟分析。模拟结果表明,流形元法对材料破坏的模拟结果更符合实际情况,这主要是由于该方法采用了两种不同的覆盖系统——数学覆盖和物理覆盖,并引入能够客观反映材料裂纹的产生与扩展准则,以及相应的块体运动理论。流形元的出现有望对材料破坏模拟开创出一条新的途径。
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| 关 键 词： | 岩石冲击破坏 数值模拟 流形元 有限元 对比分析 |
SIMULATION OF THE TOUCHDOWN VIBRATION ON COLLAPSING OF A BUILDING |
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| Abstract: | The impact of a tamper to the ground in foundation treatment was used to simulate the touchdown vibration on collapsing of the building demolished by blasting method An expression of impacting force of the tamper to the ground was derived and the factors of influencing the impacting force were studied The determined ground particle vibration velocities and their waveforms were introduced The formula of vibration velocity,fitted on the basis of the determined data,and the values of coefficient K a,α in the formula in present testing conditions were given At the same time,the technological measures of reducing the touchdown vibration on collapsing of buildings were presented |
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| Keywords: | Collapsing of buildings Vibration of touchdown Tamping vibration Simulating test |
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