Stability behavior of support with corrugated steel webs of straight wall semicircle arch shape in coal mine roadway

A new type of metal support named H-Shaped members with corrugated webs was proposed to be applied in the metal support structure of the mine roadway. Through the experimental study combined with the finite element nu- merical simulation,the stability behaviors of this type of supporting structure with corrugated webs were studied. The model tests on two straight wall semicircle arch with corrugated webs were designed to obtain the failure mode,the strain and the displacement development rules of the support,and the influence of flange thickness of corrugated steel web on the supporting capacity is analyzed. The results showed that the failure mode of the corrugated steel webs was global asymmetric buckling, when the flange thickness of the corrugated steel webs was increased from 12 mm to 16 mm,increased by 33% ,the bearing capacity of the support increased by 27. 38% . It showed that the thickness of flange has a significant influence on the bearing capacity of the support. And the finite element model was verified by comparing the experimental results with finite element analysis. At the same time,the finite element method was used to compare the I-steel for mining with the corrugated web support with the same steel consumption. The results showed that the bearing capacity of the corrugated web support was 31. 68% higher than I-steel for mining,and the deforma- tion was about 4 / 5 of I-steel for mining. Through the numerical simulation of the influence of various parameters of the section of corrugated steel web support on the elastic and elasto-plastic buckling load of the support,it was found that the height and thickness of the web are more sensitive parameters. The supporting performance of the corrugated webs support and I-steel support for mining were respectively analyzed under the hydrostatic pressure,vertical unidirectional stress and vertical force. Results showed that with the same steel consumption,the corrugated web support had higher shearing capacity,and it was not easy to undergo buckling even if it had high height-to-thickness ratios. In addition,it was flexural and the axial stability capacity could also be greatly improved since the steel consumption was concentrat- ed on the flanges. Therefore,the deformation of the corrugated web support was less than the mining I-steel support, and the supporting performance of the corrugated supporting was superior to I-steel support under various load condi- tions.