Evolution Analysis on Danger Coefficient of Surrounding Rock along CrossPassage under Vertical Shaft of Metro System
MA Feng-kai
XIAO Hong-tian
YAN Qiang-gang
Abstract：A vertical shaft then a cross passage would be often met in the urban metro construction.During the construction period,the roof collapse of the cross passage or the over large subsidence of the surface ground would be occurred.A 3D numerical simulation analysis was conducted on the excavation of the vertical shaft and then the cross passage.Based on the yielding approach index of the multi element model,with the references of the self-defined variation subprogram provided by the ABAQUS software,the dynamic display of the surrounding rock danger coefficient could be realized.In combination with the engineering construction node,the evolution analysis was conducted on the danger coefficient of the surrounding rock.Finally an explanation was conducted on the rationality of the danger coefficient index selected.The results showed that the selected index was rational.The analysis on the distribution and evolution features of the danger coefficient could be applied to guide the division,excavation and support of the surrounding rock and could provide the basis to the evolution judgement of the plastic zone and the stability evaluation of the surrounding rock.
Keywords：vertical shaft of metro systemcross passageyielding approach indexdanger coefficientevolution analysis
Publication Date：2017-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：5( 48-52 )