In order to meet the dual requirements of both tunnel surrounding rock stability and normal operation of the upper bridge structure,the measures of required protection and reinforcement measures is one of the core technologies when shield tunnel is on construction.Based on the example of the shield tunneling underpass bridge project of Metro Line 2 in a certain city,and considering such as the hydrogeological characteristics,health status of the bridge structure,and deformation characteristics of the tunnel surrounding rock during shield tunneling,this paper proposes bridge reinforcement measures to reduce construction risks.The operability of the two reinforcement measures is also compared and analyzed from the perspective of construction difficulties and bridge damage.According to the analysis results of numerical models and measured data,it is shown that compared to the reinforcement measures of"bearing replacement","steel pipe support"is easier to construct and the reinforcement effect is better with no damage to the bridge structure.After adopting it in the project,the overall deformation of the surrounding rock is smaller,and the maximum settlement of the ground and bridge foundation is within 5mm.
关键词
盾构/加固方案/数值模拟/实测验证
Key words
shield tunneling/reinforcement scheme/numerical simulation/field test and verification
维普
万方数据