基于冗余度理论的深基坑环梁支撑优化分析  

Redundancy of ring-beam supporting structures of deep excavations

作　　者：江杰[1,2,3] 肖萌 龙团元 王智 张学臣 杨迪 

机构地区：[1]广西大学土木建筑工程学院,广西南宁530004 [2]广西大学广西防灾减灾与工程安全重点实验室,广西南宁530004 [3]桂林理工大学广西岩土力学与工程重点实验室,广西桂林541004 [4]中铁建设集团有限公司,北京100040

出　　处：《广西大学学报（自然科学版）》2017年第6期2339-2346,共8页Journal of Guangxi University（Natural Science Edition）

基　　金：国家自然科学基金资助项目(51568006;41372361);广西重点实验室系统性研究项目(2016ZDX11);广西岩土力学与工程重点实验室资助课题(14-KF-03);广西科技厅岩土与地下工程创新团队项目(2016GXNSFGA380008)

摘　　要：在基坑支护结构优化过程中,为了保证优化过程的合理性和优化后支护结构的安全性,引入冗余度理论对基坑支护结构进行优化。依据南宁市九洲国际深基坑工程实例中的环梁支护结构进行结构优化分析。采用杆件拆除法,对基坑支护结构失效情况进行数值模拟,并依据冗余度理论判断失效杆件的重要程度,最终得到优化结构。从而得出结论:冗余度大的杆件重要性小,可优先考虑优化此类杆件;最终确定的优化杆件需结合冗余度和杆件轴力变化共同判断;环梁支撑杆件的冗余度最小,重要性程度最高,是主要受力杆件。依照此种方法得到的优化结构,既能满足结构的冗余度要求,又节约了成本,为类似支护结构优化和冗余度研究提供了参考。To ensure the rationality of the optimized process and the safety of the entire supporting structure,the theory of redundancy is introduced to the optimization of supporting structure in foundation pit. An optimization on ring-beam supporting of Jinzhou deep foundation pit is carriedout. By adopting bar demolition method,using numerical simulation to account for the failure of the support component,and employing the redundancy to determine the importance of the components,the final optimized structure is obtained. Conclusions are drawn as follows. The larger redundancy the member bars have,the less important they are. And optimizing the bars is the priority. The final optimized bars need to be decided by combining the change of redundancy and axial force. The ringbeam has the minimum redundancy and the highest importance,and it is the main force-bearing bar. Through this method,it not only ensured the redundancy of the supporting structure,but also economized the cost. It provides a reference for the optimization design in foundation pit supporting structure and further study of redundancy in deep excavations.

关 键 词：冗余度 环梁支撑 优化分析 数值分析 

分 类 号：TU375[建筑科学—结构工程]