Experimental Study on the Stability Analysis of Goaf Beneath Tunnel under Traffic Load

With goaf of Tongde coal mine beneath Shipogou tunnel of Lishi-Jundu expressway as geological background,the characteristics of overburden movement and the earth's surface residual deformation under traffic load were studied by using similar material simulation,and the stability of goaf was evaluated according to related standards.The results indicate that with the increase of traffic load,both the residual subsidence in caving zone,fractured zone,bending zone and the surface residual deformation of goaf increasd to different degrees;the rock mass of goaf was in activation over again;the goaf was at unstable state under traffic load,therefore,measures were needed for goaf treatment.The results provide scientific basis for goaf foundation treatment,layout of structure above goaf and its anti-deformation design.