爆炸振动对塑性混凝土防渗墙的影响

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摘要根据混凝土结构设计规范和混凝土材料力学特性的研究成果，在塑性混凝土室内力学特性实验的基础上提出适合塑性混凝土材料受压和受拉状态下的全应力–应变关系。同时结合损伤力学中的能量等效原理，分别定义塑性混凝土材料在受压和受拉状态下的损伤定义，分析损伤发展过程。在此基础上，以辽宁红沿河核电站取水口施工围堰的防渗墙爆破振动控制为背景，采用数值计算分析在爆炸振动作用下，防渗墙顶部质点振动速度与防渗墙损伤面积的关系，据此制定塑性混凝土材料的爆炸振动速度控制标准。分析结果表明，当周围爆炸作用在防渗墙顶部产生的振动速度小于3.0 cm/s时，不会对混凝土产生影响；当振动速度为3.0～7.5 cm/s时，塑性混凝土损伤面积随振动速度线性增长；当振动速度超过7.5 cm/s时，损伤开始加速上升，防渗墙开始产生结构和功能性的破坏。

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关键词 ：爆炸力学, 振动, 塑性混凝土, 损伤, 爆炸, 防渗墙

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

收稿日期: 2010-12-24

引用本文:

夏祥，李海波，于崇. 爆炸振动对塑性混凝土防渗墙的影响[J]. 岩石力学与工程学报, 2011, 30(6): 1142-1148.
XIA Xiang，LI Haibo，YU Chong. ANALYSIS OF EFFECT OF BLASTING VIBRATION ON PLASTIC CONCRETE CUT-OFF WALL. , 2011, 30(6): 1142-1148.

链接本文:

http://www.rockmech.org/CN/Y2011/V30/I6/1142

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