Reinforcement effect of shield tunnel passing under railway bridge with shallow foundation
To study the grouting reinforcement effect of shield tunnel passing under railway bridges with shallow foundation,based on the shield tunnel passing under the Hefei Metro Line 1 yard track segment and the Hefei-Wuhan freight railway bridge project,numerical simulation analysis method was used to analyze the reinforce-ment effect of in-hole grouting on the railway bridge foundation under different grouting depths,grouting rein-forcement ranges,and tunnel burial depth conditions.The results show that when the shield tunnel passes under the railway bridge with shallow foundation,the reinforcement effect of in-hole grouting can effectively control the deformation of the bridge piers;increasing the grouting depth has a significant effect on controlling the de-formation of the bridge piers;when the grouting reinforcement range is 120° to 180°,the larger the angle,the smaller the settlement and horizontal displacement of adjacent bridge piers caused by the shield tunnel,and the better the deformation control effect;when the grouting reinforcement range exceeds 180°,there is no signifi-cant change in the deformation control effect of the bridge piers;the displacement of the bridge piers caused by shield tunnel excavation is negatively correlated with the tunnel burial depth;when the in-hole grouting depth is 2 m and the reinforcement range is 120°,the tunnel burial depth must be greater than 10.6 m to meet the control standard for bridge pier settlement.
万方数据
维普
