›› 2011, Vol. 32 ›› Issue (2): 459-464.

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Analysis of fracture mechanics for falling tall chimneys during demolition blasting

YANG Jian-hua1, MA Yu-yan1, LU Wen-bo1, SUN Jin-shan2, CHEN Ming1   

  1. 1. State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University，Wuhan 430072, China; 2. Faculty of Engineering, China University of Geosciences (Wuhan), Wuhan 430074, China
  • Received:2010-03-02 Online:2011-02-10 Published:2011-02-16

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Abstract:

In order to explain the frequent phenomenon that tall chimneys with a height more than 150m always fracture during falling process during demolition blasting, a mechanical model of tall reinforced concrete chimneys is set up in the directional falling process through the appropriate structural design parameters selected in accordance with the design standard of chimneys. The inner force distribution and limit bearing capacity expressions of chimney section at any time are derived; and the failure mechanism is analyzed. And then the evaluation is carried out if chimneys will fracture or not during demolition blasting according to its load and section strength. Results show that tall chimneys with a height more than 150 m will fracture at the section to the top 1/3 height when the tilting angle reaches to 40°-60°during demolition blasting.

Key words: tall chimneys, demolition blasting, directional falling, bearing capacity, fracturing

CLC Number: 

  • TU 279.7
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