基于动态设计理念的江洲深基坑内支撑优化设计

Optimization design of internal support of deep excavation located in river island based on dynamic design philosophy

在实际工程中,由于工程初步勘测的局限性以及实际施工过程的动态变化,在施工过程中需根据工程状况和监测反馈信息,对设计作动态调整以确保安全、工期和经济的和谐统一。基于动态设计理念,依托江洲深基坑工程,针对江洲基坑地下水位变化大的显著特点,采用数值模拟研究了不同水位下围护结构受力变形状态。模拟结果表明水位变化对围护结构受力变形存在较大影响。在此基础上,结合实际水位监测反馈信息和施工监控状况,将动态设计理念应用于围护结构内支撑,更改了支撑设计方案;现场实施效果证明了新方案的可行性与经济性。

Because of the limitation of preliminary survey and dynamic change of construction in actual engineer- ing, it is necessary to adjust design proposal dynamically according to project status and feedback information to make sure the harmony of safety and time and economy. Aimed at deep excavation engineering in river island which groundwater level change largely in different periods, the force and deformation state of envelop enclosure under different groundwater level were analyzed with numerical simulation based on dynamic design philosophy. The results show that the change of groundwater has a significant impact on the envelop enclosure. Combined with the feedback information of groundwater level monitoring and construction condition, the dynamic design philosophy was applied to the internal support and the support design scheme was changed. The implementation effect shows the feasibility and economy of the new proposal.