【摘要】 当前高精度制导武器应用广泛，对防护结构同一部位进行多次连续打击在技术上已不存在障碍，然而高精度制导武器集中连续打击下结构的累积毁伤效应、毁伤特征以及剩余结构承载能力等课题均有待进一步分析。该研究对岩质地层中硐室遭受常规武器二次爆炸的毁伤效应进行了系统性探究。首先，基于结构抗力计算理论给出了两次打击下硐室结构的毁伤指标表征方法及毁伤荷载量化关系，定义了二次毁伤的临界荷载P_u并给出了数学表达式；其次，开展了岩质地层中的硐室二次爆炸缩比试验，获取了二次爆炸毁伤模式及基准数据；最后，通过数值仿真开展了不同工况条件下硐室结构的二次毁伤效应数值试验，当第一次打击比例爆距较小时(<0.62 m/kg~3),结构在第二次打击时受第一次爆炸作用的影响较大、受第二次爆炸作用的影响较小；当第一次打击比例爆距较大时(>0.62 m/kg~3),结构在第二次打击时受第一次爆炸作用的影响较小、受第二次爆炸作用的影响较大。缩比试验和数值试验的数据也验证了通过临界荷载P_u判断结构二次毁伤状态的合理性。相关结果可支撑地下结构的累积毁伤评估和防护设计。更多还原

【Abstract】 Currently, high-precision guided weapons are widely used, and there are no technical barriers to conducting multiple continuous strikes on the same part of the protective structure. However, structures’ cumulative damage effect, damage features and residual load-bearing capacity under high-precision guided weapon concentrated continuous strikes need further analysis. Here, a systematic study on damaging effects of two consecutive strikes of conventional weapons on cavern in rock formations was performed. Firstly, based on the theory of structural resistance calculation, the damage index characterization method and damage load quantification relationship of cavern structure under two strikes were proposed. The critical load P_u for two times damage was defined and its mathematical expression was derived. Secondly, two-strike scale reduction tests of cavern were conducted in rock formations to obtain two-strike damage modes and benchmark data. Finally, numerical simulation tests were conducted to investigate two-strike damage effects of cavern under different working conditions. It was shown that when the first strike scaled blast distance is smaller(<0.62 m/kg~3), cavern is more affected by the first strike during the second strike and less affected by the second strike; when the first strike scaled blast distance is larger(>0.62 m/kg~3), cavern is less affected by the first strike during the second strike and more affected by the second strike; data from scale reduction tests and numerical simulation tests also verify the rationality of using the critical load P_u to determine two-strike damage state of cavern; the relevant results can support cumulative damage assessment and protective design of underground structures.更多还原