This paper studies the impact of possible rockfall in the karst cave on the structural stress of the moun-tain tunnel.A finite element model of the tunnel structure is established to analyzed the influence of changes in inter-nal forces under different weight of falling rocks,which is based on a mountain tunnel project with a large karst.The results indicate that the internal forces of the lining arch foot and arch crown are relatively large,and the lining struc-ture needs to consider the appropriate expansion of the arch foot.As the weight of falling rocks increases,the in-crease in structural bending moment is smaller than the increase in structural axial force.In addition,when the maxi-mum weight of falling stones at a height of 35 m is 80 tons,the outer arch lining of the tunnel meets the design re-quirements for ultimate bearing capacity.This study may provide the reference for the analysis of rockfall treatment in similar projects.
karst caves in mountain tunnelrockfall impactultimate weight of falling rocks
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