针对土中钢板-钢筋混凝土竖井结构受二次爆炸作用下的破坏特征和变形计算问题，基于竖井结构抗一次爆炸试验，开展有限元计算和理论分析。讨论了不同一次、二次爆炸比例爆距情况下竖井结构的破坏特征、一次爆炸工况对二次爆炸后结构变形的影响，提出了一次爆炸后竖井结构抗力衰减评价指标，参数化分析了竖井混凝土强度和钢板厚度对抗力衰减程度的影响规律和机理，构建了二次爆炸作用下竖井结构弹塑性变形计算方法。研究结果表明: ①二次爆炸作用与一次爆炸作用竖井结构破坏模式和破坏特征相同，但一次爆炸会导致结构发生塑性变形和抗力衰减，从而使二次爆炸时竖井结构变形增大，破坏程度加剧；②可以采用结构广义刚度Kstru的衰减程度I表征一次爆炸后竖井结构的抗力变化，衰减程度I与一次爆炸竖井结构无量纲环向相对位移α1相关；③混凝土强度对结构抗力衰减规律影响不大，钢板与混凝土厚度比的增大可以减缓结构抗力的衰减速度；④结合竖井结构一次爆炸弹塑性变形计算方法和结构抗力衰减计算方法得到的二次爆炸作用下竖井结构弹塑性变形半经验计算方法与数值模拟计算结果误差小于8.1%，可以为竖井结构抗爆设计计算和毁伤评估提供依据。
Abstract
In order to study the failure characteristics and deformation calculation of steel plate-reinforced concrete shaft structure in soil under secondary explosion, finite element calculation and theoretical analysis were carried out based on the anti-primary explosion test of shaft structure. The failure characteristics of the shaft structure under different primary and secondary explosion proportional explosion distances and the influence of the primary explosion condition on the structural deformation after the secondary explosion were discussed. The evaluation index of the resistance attenuation of the shaft structure after the primary explosion was proposed. The influence of the strength of the shaft concrete and the thickness of the steel plate on the attenuation degree of the resistance were analyzed, and the calculation method of the elastoplastic deformation of the shaft structure under the secondary explosion was constructed. The following conclusions are obtained: ① The failure mode and failure characteristics of the shaft structure under the secondary explosion are same as those under the primary explosion. However, the primary explosion will lead to plastic deformation and resistance attenuation of the structure, which will increase the deformation and damage degree of the shaft structure under the secondary explosion; ② The attenuation degree I of the generalized stiffness Kstru can be used to characterize the resistance change of the shaft structure after primary explosion. And the attenuation degree I is related to the dimensionless circumferential relative displacement α1 of the shaft structure after an explosion; ③ The strength of concrete has little effect on the attenuation of structural resistance. But the increase of the thickness ratio of steel plate to concrete can slow down the attenuation rate of structural resistance. According to the analysis results, the empirical formula of I was obtained by fitting; ④ The semi-empirical calculation method of elastic-plastic deformation of shaft structure under secondary explosion combined with the calculation method of elastic-plastic deformation of shaft structure under primary explosion and the calculation method of structural resistance attenuation is obtained. The error between the semi-empirical calculation method and the numerical simulation calculation result is less than 8.1 %, which can provide the basis for the anti-explosion design calculation and damage assessment of shaft structure.
关键词
二次爆炸 /
竖井结构 /
破坏特征 /
弹塑性变形
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Key words
secondary explosion /
shaft structure /
failure characteristics /
elastic plastic deformation
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