【摘要】 以京津城际延伸线天津—于家堡盾构隧道为背景,采用数值模拟和现场监测相结合的方法,对新建盾构隧道侧穿邻近不同形式基础的建筑物产生的地面沉降、建筑物差异沉降进行深入研究,分析盾构到达建筑物之前、侧穿过程及离开后3个阶段沉降变化规律,分别模拟了加固前后地面沉降及差异沉降变化情况,结果表明,建筑物靠近隧道一侧沉降明显,产生沉降最大的阶段为盾构通过建筑物阶段,且无论在累积沉降还是在差异沉降方面浅基础建筑受到的影响要大于深基础建筑,同时加固方案能大大减小地面沉降及差异沉降。从加固后的数值模拟计算结果与现场监测情况来看,两者所反映的规律是一致的,验证了FLAC3D模拟盾构施工对沿线建筑物沉降影响是可靠的。更多还原

【Abstract】 In the background of Beijing-Tianjin inter-city extension line which from Tianjin to Yujiapu,adopts the method of combining numerical simulation and monitoring,studies the ground settlement and buildings differential settlement caused by new shield tunnel crossing adjacent different forms of foundation,analyzes the settlement variation of three stages which before shield reach the building,through the building and leave the building, then simulates the ground settlement and buildings differential settlement change before and after the reinforcement,the results show that the building settlement near the tunnel is obvious,the settlement that the shield crossing the building is the greatest,and the total settlement and buildings differential settlement that the shield side-crossing shallow foundation building is greater than side-crossing the deep foundation building,and grouting can greatly reduce the ground settlement and differential settlement. From the numerical simulation results and the monitoring after grouting,the law is consistent,that validates the rationality of FLAC3 Dpredicting building settlement caused by shield construction.更多还原