高强混凝土试块爆破损伤累积规律试验研究

为揭示多次爆破对高强混凝土的损伤累积规律,设计了高强混凝土试块损伤累积试验,对试块损伤和裂纹进行计算和统计。结果表明:单次爆破下试块的损伤值随测点到爆源中心距离的增大而减小,其中近区损伤值迅速降低,而中区损伤值则缓慢降低,并能维持在一个相对稳定的损伤值范围内;在多次爆破中测点损伤值以相同的趋势增长,且多次爆破下测点损伤值随着爆破作用次数的增加持续增大,近区损伤值增长较快,中区测点损伤可分为初期缓慢增加和后期跃迁式增大两个阶段,同时中远区测点损伤值累积呈现有突变的过程。

Experimental Study on Accumulation Law of Blasting Damage on High-strength Concrete Block

In order to reveal the laws of damage accumulation in high-strength concrete under the multiple blasts,the damage accumulation testing experiment of high-strength concrete block was designed,and the damage and crack of concrete block was counted. The results showed that the blasting damage value of the measure point reduced with the distance increasing. Its decay process can be divided into rapid decrease phase near the blasting area,slow decrease stage in middle area. The value of the middle area was maintained at a relatively stable damage range. In the multiple blasting,the damage value of the measured points went on growing with the increase of the blasting times, and the damage near the blasting area grew faster. The damage value can be divided into two stages in middle area, a slow increase at early stage and a quick increase at later stage. But with the increase of number of blasting effect, especially in the last few times,the damage accumulation had a mutation process at the moderate area.