Study on uplift bearing capacity characteristics of aerated bolt
In order to study the deformation characteristics of the pull-out interface of inflatable bolts under specific conditions and their influence on bearing capacity.The three-dimensional finite difference software FLAC 3D is used to establish the numerical calculation model of inflatable bolt,on this basis,the inflatable pressure,buried depth and rubber membrane length of the bolt are changed to obtain the corresponding load-displacement curve,and the bearing characteristics and displacement changes of the inflatable bolt are analyzed.The results show that from the theo-retical analysis of anchoring mechanism,the expansion body of the anchor section can effectively improve the pull-out bearing capacity of the anchor.From the numerical model calculation and a-nalysis,changing the inflation pressure,rubber membrane length and burial depth can improve the pull-out bearing capacity of the bolt,which is increased by 1.93%,1.66%and 13.2%compared with the initial conditions,and the limit displacement changes are 0.05mm,0.17mm and 0.15mm,respectively.Changing the buried depth is the most effective way to improve the bearing capacity of the bolt,and increasing the air pressure of the bolt can effectively improve the bearing capacity while better controlling the change of displacement.
Inflatable boltFLAC 3DPulling capacityInflation pressureRubber film lengthDepth of burial
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万方数据
