爆炸振动对塑性混凝土防渗墙的影响

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Abstract According to the code for design of concrete structure and scientific research achievements of plastic concrete materials，and based on the experimental results of mechanical characteristics of plastic concrete materials，complete stress-strain relationships for plastic concrete materials under compression and tension are proposed respectively. Accordingly，damage definitions of plastic concrete have been put forward on the basis of energy equivalence theory；and damage development process is also analyzed. As a case study，a velocity-based controlling method for plastic concrete damage due to blasting vibration propagated from surrounding rock blasting at a project of rockfill cofferdam in Hongyanhe Nuclear Power Plant(HNPP)，Liaoning，China，is described. The relationship between the damage area at cut-off wall section and the peak vibration velocity at the top of cut-off wall，which is constructed with plastic concrete and lies in the inner part of rockfill cofferdam，has been studied in detail. Then，a blasting vibration velocity control standard is set up for plastic concrete material in HNPP. It?s shown that blasting vibration will not result in damage to plastic concrete when the peak velocity at the top of cut-off wall is less than 3.0 cm/s. The damage area increases linearly with peak velocity when the peak velocity at the top of cut-off wall is in the range of 3.0–7.5 cm/s. When the peak velocity goes beyond the value of 7.5 cm/s，the damage area will increase dramatically and the cut-off wall begin to lose its function.

Key words： mechanics of explosion vibration plastic concrete damage blasting cut-off wall

Received: 24 December 2010

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https://rockmech.whrsm.ac.cn/EN/Y2011/V30/I6/1142

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