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为实现水工建筑物水平建基面的快速开挖,提出用于竖直炮孔的聚–消能复合垫层结构,并通过混凝土配合比试验研制出了制作聚–消能结构的高波阻抗混凝土材料。利用基于LS-DYNA二次开发的爆破损伤数值仿真技术分析了该复合垫层对炮孔底部损伤特性的影响,论证其用于水平建基面开挖的可行性;并结合在白鹤滩水电站的爆破试验,测试爆后控制基面的超欠挖和爆破损伤深度,验证该复合垫层爆破方法的使用效果。结果表明,聚–消能复合垫层保护下的水平建基面开挖方法能有效控制水平建基面开挖的超欠挖和爆破损伤深度,获得良好的建基面效果,同时,该方法能够充分利用开挖工作面,可实现水平建基面的快速大规模开挖,提高生产效率。
In order to realize the rapid excavation of the horizontal foundation surface of hydraulic structures, the poly-energy dissipation composite cushion structure for vertical borehole is proposed. The high wave impedance of poly-energy dissipation structure is developed through the concrete mix test Concrete material. The impact of the composite cushion on the bottom of the blast hole was analyzed by using the numerical simulation of blasting damage based on the secondary development of LS-DYNA, and the feasibility of using the composite cushion on the excavation of horizontal foundation surface was demonstrated. Combined with the numerical simulation of blasting damage at Baihetan Hydropower Station Blasting test to test the overbreak and underbreaking depth of control base surface after blasting and verify the using effect of the composite cushion blasting method. The results show that the horizontal excavation method under the protection of poly-energy dissipation composite cushion can effectively control the overbreak due to underbreaking and blasting, and obtain a good foundation effect. Meanwhile, this method Can make full use of excavation face, can achieve rapid horizontal excavation of large-scale excavation, improve production efficiency.