Evaluation Study of Grouting Effect in Urban Sand Tunnel
Based on the underpass project of Kaiyuan Road-Jianyuan Road in Xi'an City,the deforma-tion characteristics of sand tunnel under the conditions of no grouting reinforcement and full-face grou-ting reinforcement were compared and analyzed by numerical simulation,and the excavation effect of middle partition method was evaluated.The results show that the ground settlement and vault dis-placement without grouting reinforcement are 4.78 times,4.44 times,7.08 times and 5.73 times that of full-face grouting reinforcement,respectively.The supporting stress caused by tunnel excavation under the condition of unconfined tunnel face is less than that under the condition of full-face grouting reinforcement,and the left and right tunnels are under the condition of full-face grouting reinforce-ment.The extrusion deformation of the tunnel face of excavation section is much smaller under the condition of full-face grouting reinforcement than under the condition of no grouting,and the maxi-mum and minimum displacements are reduced by 80％on average.The numerical simulation results show that the tunnel excavation settlement shows a safe and stable situation under the condition of full-face grouting reinforcement.
万方数据
维普
