地铁车站基坑换撑设计对基坑变形研究

Study on deformation of foundation pit about design of support exchange in metro foundation pit

换撑设计多用在基坑围护中,尤其地铁围护结构基坑常采用换撑设计以控制基坑变形、周边建(构)筑物沉降等。以已建成苏州地铁某车站未设置换撑的超深基坑为工程背景,运用启明星等软件模拟不设置换撑与设置换撑不同工况下,基坑变形及周边管线沉降数据地墙位移等,与实际监测数据进行对比分析,研究地铁车站围护结构换撑设计的经济性与合理性。

Support exchange is commonly used in the foundation pit enclosure,especially in the metro foundation pit shoring.Support exchange is often used to ensure that relevant parameters such as deformation of foundation pit and settlement of surrounding buildings are controlled within certain limits.In this paper,taking an ultra-deep foundation pit without bracing support exchange in a completed station of Suzhou metro as the engineering background,software such as Qimingxing is used to simulate the deformation of the foundation pit and the settlement data under different conditions of not setting bracing replacement and setting bracing replacement,and comparing with the actual monitoring data,the economic rationality of the bracing replacement design of the envelope structure of subway station is studied.