地铁深基坑支护结构变形预测分析与应用

随地铁深基坑施工的进行,为确保施工安全,都采取降水措施,深基坑侧面土体由于失水而导致其物理力学性状不可避免的发生变化,因此基坑侧面土体的m值也是不断变化的。利用现场监测的深基坑支护结构变形信息资料,结合参数优化反分析土体m值,根据现场地质资料和优化后的参数通过有限元计算对深基坑支护系统进行变形预测,及时调整开挖方案和支护参数,此方法可以有效地指导基坑施工,使得基坑围护结构的变形始终处于可控制状态,以确保施工安全。

Analysis and Application of Prediction for Displacement of Support Construction in Metro Foundation Pit

In the process of foundation pit construction, water level lowering must be taken in order to ensure the construction safety. Due to loss of water, the side ground of foundation pit will inevitably have a change in its physic-mechanical performance, so the values "m" of side ground will also vary constantly. Making use of the information on the deformation of the retaining structure and the parameter of optimized contrary analysis on the values "m" can give the prediction of the deformation by the method of finite elements and adjust excavation scheme and supporting parameter timely. By this approach, the construction can be instructed effectively, and the situation of deformation will be always under the control, so that the safe construction will be guaranteed.