Meikuang Anquan (May 2023)
Study on anti-impact support structure performance of multi-direction energy absorption for roadway
Abstract
Aiming at the problem of insufficient impact resistance of the existing portal support, a kind of anti-impact support structure for multi-direction energy absorption was constructed by adding V-shaped groove to the beam structure and flexible chain support structures on both sides. Parameters such as total energy absorption, plastic strain and vertical displacement were used as analysis indexes to study the supporting performance of the support in the face of vertical impact and lateral impact, and the deformation degree for each structure of the support and the overall most vulnerable position were obtained. Under the vertical impact condition, the equivalent plastic strain position of the new support appeared at the middle joint of the top beam, and then the joint of the top beam should be thickened. In the whole process of vertical impact, the vertical displacement of the three hydraulic columns was not average, which indicated that the support was not very ideal in the face of concentrated impact. Under vertical impact conditions, the V-shaped groove had a small deformation in the face of the impact with large velocity, and a large deformation in the face of the impact with small velocity, which showed that the V-shaped groove had a certain response speed in the face of impact. Under lateral impact conditions, the equivalent plastic strain of the support was mainly concentrated at the connection between the flexible chain and the support when the impact velocity is low, and the annular base should be installed at the connection between the flexible chain and the support. The bearing capacity and total energy absorption of flexible chain support structure under lateral impact were slightly weaker than that of support under vertical impact, but they can play a good role in horizontal support.
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