非对称深基坑变形规律现场监测

根据南京市青奥轴线地下交通工程主隧道基坑特点，制定了深基坑开挖施工监测方案，并使用 测斜仪、频率接收仪对基坑的深层水平变形、墙体关键位置处的水平位移以及钢筋混凝土支撑轴力进行 监测。结果表明:非对称基坑开挖过程中，随着基坑开挖深度和支撑的架设位置的不同，墙体位移的模 式也不尽相同；最大水平位移发生位置逐渐下降至６／７倍基坑开挖深度；同时各级轴力也相应增加，并 呈现交替形式。监测过程中，各项数据均小于报警值，支护方案有效。

In-situ Monitoring for Deformation Laws of Asymmetric Deep Foundation Pit

The in-situ monitoring plan for the excavation of deep foundation pit was designed according to the main tunnel excavation characteristics of the axial underground traffic engineering of the Youth Olympic Games in Nanjing, and the deep horizontal displacement, the horizontal displacement of the key-sections of the wall and the axial force of the steel- concrete supports were monitored by inclinometer and frequency receivers. The results show that during the excavation of the asymmetric deep foundation pit, the model of the wall displacement were various with the different depth of the exca- vation and the location of the supports; the place of the maximum horizontal displacement also gradually moved down to 6/7 times of the excavation depth; meanwhile the axial force of each steel-concrete support also increased by turns. Dur- ing the monitoring, the monitoring values were all smaller than the warning value, so the supporting plan is effective.