The dissimilar test method is carried out for tunnel response induced by foundation pit excavation in soil-rock mixtures. The discontinuous characteristics of the mixtures complicate the influence of foundation pit excavation on adjacent tunnel. Meanwhile, the influence of rock content w on the tunnel response induced by foundation pit excavation is studied. The experimental results show that: (1) An increase in w would decrease the tunnel segment moment. (2) Variations of earth pressures around tunnel lining show different laws in the cases of w<60%,w =60% and w = 90%. (3) When 0%< w ≤ 60%, the increase of rock content cannot reduce the variation on deformation and displacement of tunnel segment; however, the variation on deformation and displacement of tunnel segment can be effective controlled in the case of w = 90%.