Comparative Study of Surrounding Rock Disturbance Characteristics of Tunnel Construction with Cantilever Roadheader Method and Drilling and Blasting Method
In order to reveal the mechanical effects and deformation disturbance characteristics of surrounding rocks during the construction processes of cantilever roadheader method and drilling and blasting method in metro tunnel projects,a comparative analysis was conducted using the finite element software based on the construction of a tunnel section between Qianlingshan Park Station and Beijing Road Station on the proposed Guiyang Rail Transit Line 3.The comparative analysis focused on the displacement field,disturbance area,and anchor bolt stress of the surrounding rocks in grade V rock conditions under cantilever roadheader method and drilling and blasting method.The results show the following:the maximum deformation of the surrounding rock is 343.29 mm,which is about 22 times that of the cantilever roadheader method.The disturbance area of surrounding rock is also much larger than that of cantilever roadheader method.The analysis of support structure shows that in cantilever roadheader method excavation of grade V rock,the maximum tensile stress of the anchor bolt is approximately 92.7%of that in drilling and blasting method,and the maximum compressive stress on the initial support is approximately 48.0%of that in drilling and blasting method.This indicates that cantilever roadheader method can significantly reduce the stress on the anchor bolt and initial support,reducing the risk of damage.It confirms the superiority of cantilever roadheader method over drilling and blasting method in reducing disturbance to the surrounding rocks.
tunnel engineeringcantilever roadheader methoddrilling and blasting methodnumerical simulationmechanical effectcomparative analysis
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