XU H L, GAO H J, GUO X,et al.Study on the impact resistance of a new type of support under circumferential pressure[J].Journal of Henan Polytechnic University(Natural Science) ,2024,43(4):21-28.

doi:10.16186/j.cnki.1673-9787.2022090053

Received:2023/06/21

Revised:2023/09/22

Published:2024/07/05

Study on the impact resistance of a new type of support under circumferential pressure

XU Hailiang, GAO Hanjun, GUO Xu, SONG Yimin, AN Dong

School of Civil Engineering，North China University of Technology，Beijing 100144，China

Abstract: Objectives In view of the problems with traditional portal support structures in roadways， MethodsA  multi-directional energy-absorbing and anti-impact support structure was proposed was proposed.By establishing a numerical analysis model under the synergistic action with the surrounding rock，the support effect of the support system in the face of static load，vertical impact and lateral impact conditions was studied.  Results The results showed that：（1）Under static load conditions，the top and bottom of the left and right columns of roadways were most prone to damage，the new type of bracket only experienced a small vertical displacement，resulting in a better support effect.（2）Under the action of vertical and lateral impact，roadways were prone to damage at the corner and the top and bottom respectively.In the case of lateral impact，the top and bottom of roadways tended to be damaged，necessitating subsequent strengthening of the center column of the bracket.（3）The deformation trends of the new bracket facing vertical and lateral impact conditions were basically same，with the first yielding occurring at the connection between the top beam and the column structure，which could be subsequently reinforced.（4）Compared to traditional portal brackets，the new bracket’s flexible chain and V-groove structure responded quickly to impact，providing better protection for the support structure.  Conclusions The results of the study provided a useful reference for the use of portal support structures in tunnel support.

Key words:multi-directional energy-absorbing and anti-impact support structure;energy-absorbing element;roadway support;impact ground pressure