基于爆破荷载作用下引导式柔性防护网的受力分析

Passive or active flexible protection system is one of the effective means for the prevention and control of rockfall disaster. A large number of intercepted rocks remain in the structure, resulting in secondary disaster. For this problem, there is a new type of flexible protective structure, called guided flexible protection, and it is gradually applied in engineering. In the existing finite element models, impacting structure only by a single rock, there is a huge difference with the real situation of rockfall. Therefore, simulating the process of excluding dangerous rocks by blast through fluid-structure interaction, and according to the characteristics of large deformation and displacement of flexible struMechanical analysis of Guided Flexible Protection Based on Blasting Loadctures, the finite element model of the whole process of multiple rocks impact guided protection under the blasting load is constructed. It is revealed that the two-stage interaction process of intercept and guide between multiple rocks and structure. Then the two - stage mechanical behavior of each component is compared and analyzed. The internal force of net reaches maximum at the lead stage. The internal forces of the upper and lower support cables respectively reach maximum at the intercept and guide stage, and the internal force of the upper support cable is much larger than the lower one. There are two axial force peaks of posts respectively in two stages, and the peak in guide stage is slightly larger. Then, clearing the energy distribution of system, the brake ring is the main energy consuming component, and the energy dissipation in the intercept stage is much greater than the guide stage. Finally, the path of force transfer is obtained. This research provides the guidance for the design and optimization of guided flexible protection in engineering.