【摘要】 冻土隧道爆破开挖过程中,炸药爆炸产生大量高温高压的爆生气体,破坏周围冻土原有的热平衡,易引发特殊的工程灾害。本文提出一种新型装药结构——复合不耦合装药结构(水或盐水+空气不耦合装药结构),并在爆破洞室进行不同装药结构的降温对比试验研究和不同试验条件下的试件爆破损伤参量研究。结果表明,该装药结构能够有效吸收部分爆生气体的热量,降低爆生气体和工作面的最高温度,改变爆炸应力波和爆生气体的能量分配比例,达到降温和减振的效果。这种复合不耦合装药结构在风火山冻土隧道开挖中进行实地应用,取得良好的爆破效果。更多还原

【Abstract】 During the excavation process of the frozen-soil tunnel,explosives produce high-temperature and high-pressure blasting gases which may break the thermo balance of original frozen-soil and trigger engineering disasters.The paper proposes one new-type charge structure,the water-air decoupling charge structure,which is characterized by the water/salt-water + air decoupling charge structure.Experiments on temperature effects and media fracture parameters are carried out in the blasting tunnel structure.The results show that the proposed structure can absorb largely the heat produced by explosion and hence reduce the highest gas temperature in the work-face.Benefited by this advantage,the energy ratio between the blasting stress wave and the explosive gases is improved properly.Therefore,the purpose to reduce temperature and vibration is achieved.This technology is applied in practical engineering in the Fenghuoshan Tunnel project and produces satisfactory results.更多还原