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开展饱和钙质砂爆炸密实动力特性试验研究,探索饱和钙质砂爆炸密实机制和密实效果,对钙质砂地层中进行的工程建设有重要的理论意义和工程实用价值。通过控制爆炸参数,测试不同参数作用时钙质砂爆炸前后声波特性和表面沉降规律,揭示饱和钙质砂爆炸密实动力特性。试验结果表明:钙质砂高孔隙比和颗粒破碎特性对爆炸密实效果有重要影响。爆炸密实作用后,在爆炸近区,钙质砂颗粒受到较强爆炸冲击作用,导致钙质砂颗粒破碎而形成破碎区和压缩区,压缩区随着时间的推移有松弛的趋势,钙质砂颗粒结构重新固结过程在爆炸后2 h内基本完成。
It is of great theoretical significance and engineering practical value to carry out the dense dynamic experiment of saturated calcareous sand explosion and to explore the densification mechanism and density effect of saturated calcareous sand explosion. By controlling the explosion parameters, the acoustic characteristics and surface subsidence law before and after calcareous sand explosion were tested under different parameters to reveal the dense dynamic characteristics of saturated calcareous sand explosion. The experimental results show that the high void ratio and particle crushing properties of calcareous sand have an important effect on detonation densification effect. Explosion compact effect, in the vicinity of the explosion, calcareous sand particles by a strong explosion impact, resulting in calcareous sand particles crushed to form crushing zone and compression zone, the compression zone with the lapse of time there is a tendency of relaxation, calcareous sand Particle structure re-consolidation process within 2 h after the explosion basically completed.