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楔挡分流结构是一种新型的拦挡结构,在灾害防治中发挥着重要作用,对其在爆炸等特殊荷载作用下的损伤进行研究具有重要的意义。使用ANSYS/AUTODYN软件,首先采用光滑粒子流体动力学方法(smoothed particle hydrodynamics,SPH)和混凝土的RHT(Riedel-Hiermater-Thoma)本构,对前人试验模型进行了模拟计算。通过对试验和模拟结果的对比分析,验证了SPH算法和混凝土RHT本构在模拟混凝土介质中爆炸损伤的可行性。然后使用同样的算法和材料本构,建立全尺寸模型,对混凝土楔挡分流拦挡坝坝体内爆炸损伤及应力波传播进行了模拟计算。通过对计算结果的分析,研究了混凝土介质中爆炸成坑的机理,得到了楔挡分流结构在内部爆炸作用下的爆坑形态特征、药柱上下部混凝土损伤特点、破碎区范围。对坝体中冲击波传播及混凝土碎块抛射等问题进行了探索。
Wedge blocking diversion structure is a new type of block structure, which plays an important role in disaster prevention and treatment. It is of great significance to study its damage under special loads such as explosion. The ANSYS / AUTODYN software was used to simulate the previous experimental model by using smoothed particle hydrodynamics (SPH) and RHT (Riedel-Hiermater-Thoma) constitutive model of concrete. The feasibility of the SPH algorithm and the concrete RHT constitutive model for the explosion damage in the simulated concrete medium is verified by comparing the experimental results with the simulated ones. Then, using the same algorithm and material constitutive model, a full-scale model is established to simulate the explosion damage and stress wave propagation in the dam body of concrete wedge diversion dam. Through the analysis of the calculation results, the mechanism of explosion into concrete pits in concrete was studied. The characteristics of the shape of pits in the wedge block shunt structure under internal explosion were obtained. The damage characteristics of the concrete at the upper and lower parts of the pits and the range of the broken area were obtained. The problems of shock wave propagation and concrete fragment ejection in the dam are explored.