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优化复合锚固结构是由土钉和在土钉端部系统而规律地设置的一定长度的经特殊处理的空孔段群组成。空孔群在围岩介质中造成一个弱化区,弱化区介于支护结构与围岩介质之间,将原有的二介质系统(支护结构和围岩),改变为三介质系统(支护结构、弱化区和围岩)。爆炸条件下,优先由弱化区产生变形、破碎、压实或压密,同时大量吸收爆炸能,使支护结构的危机得以转移至弱化区而本身不受损。优化复合锚固结构对比单一锚固结构具有优异的抗动静载性能。因此进行对比试验,研究优化复合锚固结构及单一锚固结构的抗爆性能。试验结果表明,在支护结构产生临界破坏前后,单一锚固结构的质点加速度量值是优化复合锚固结构的2.22倍以上,前者的动应变量值是后者的5.30～4.50倍以上。在临界破坏条件下,优化复合锚固结构的抗力是单一锚固结构的5.10倍以上,在极限破坏状条件下,前者是后者的4.13～3.40倍以上。
The optimized composite anchoring structure is made up of a group of soil nails and a set of regularly-treated holes of a length that are regularly arranged at the soil nailed end system. The pore group results in a weakened zone in the surrounding rock media. The weakened zone is located between the supporting structure and the surrounding rock media. The original two-media system (supporting structure and surrounding rock) is changed to a three-media system Retaining structure, weakening area and surrounding rock). Under the condition of explosion, the deformation, crushing, compaction or compaction of the weakened zone is preferentially preferentially generated. At the same time, a large amount of the explosive energy is absorbed, so that the crisis of the supporting structure can be transferred to the weakened zone without being damaged by itself. Optimized Composite Anchorage Structure Compared with a single anchorage structure, it has excellent anti-static and anti-static performance. Therefore, comparative tests were conducted to study the antiknock performance of composite anchorage structures and single anchorage structures. The experimental results show that the mass acceleration of a single anchorage structure is 2.22 times higher than that of the optimized composite anchorage structure before and after the critical damage occurs to the supporting structure, and the former is 5.30 ~ 4.50 times the latter. Under the condition of critical failure, the resistance of the optimized composite anchoring structure is more than 5.10 times that of a single anchoring structure. Under the condition of ultimate destruction, the former is 4.13 ~ 3.40 times higher than the latter.