论文部分内容阅读
以南京过江隧道工程为研究对象,在复杂地质条件下,对大断面双层过江盾构隧道与竖井连接处进行三维数值模拟计算,根据分析结果提出了针对性的工程抗震措施。地震动力响应分析采用三维动力有限差分方法,对其模型输入不同方向的南京波与修正后的汶川波,得出了过江隧道结构在三维围岩环境下的动力响应、应力、变形特征等。研究表明最大压应力一般集中在拱腰处,在仰拱部位和盾构与竖井连接处会出现受拉区,最大位移一般出现在拱顶和盾构与竖井连接处;输入修正后的汶川波比南京波所引起的位移和应力都要大得多。最后提出了能进一步增强隧道抗震性能的建议。
Taking Nanjing cross-river tunnel project as the research object, under the complex geological conditions, the three-dimensional numerical simulation of the connection between the tunnel and the shaft of the large cross-section double-decked shield tunnel was proposed. According to the analysis results, the corresponding engineering seismic measures were proposed. The dynamic response of the seismic response analysis using three-dimensional dynamic finite difference method, the model input in different directions of the Nanjing wave and the modified Wenchuan wave, arrived at the tunnel structure in three-dimensional surrounding rock dynamic response, stress, deformation characteristics. The study shows that the maximum compressive stress is generally concentrated in the arched waist and the tension zone appears in the arch area and the connection between the shield and the shaft. The maximum displacement generally appears at the junction of the vault and the shield and shaft. The input of the modified Wenchuan wave Than the Nanjing wave caused by the displacement and stress are much greater. Finally, some suggestions to further enhance the seismic performance of the tunnel are proposed.