Abstract
Geological conditions of urban subway foundation pits are controllable factors in determining the deformation of pits. In this paper, the monitoring data and statistical data of a subway deep foundation pit in North China are presented and compared with those of Tianjin subway. The deformation characteristics of the proposed pit, open excavated with triple-layer steel supports, are introduced in detail. Based on the aforementioned information, the energy conservation equation of the mobilized strength design (MSD) method in which the compression deformation energy of internal support is considered is applied to predict the maximum lateral movement. The maximum lateral movement turns out to be 22.2 mm according to the improved MSD method, which is very close to the measured value.
Highlights
In the construction of metro, the deformation control of deep pit is one of the most crucial topics
Peck [1] conducted a detailed study on the ground settlement caused by the excavation of soft soil foundation pit and obtained the estimated value of the soil settlement outside the pit
Wang et al [4] and Yang and Lu [5], respectively, used numerical analysis methods to analyze the relationship between the deformation mode of support structure and the settlement range, settlement distribution form, the maximum value of settlement, and the location of the soil around the foundation pit
Summary
In the construction of metro, the deformation control of deep pit is one of the most crucial topics. Researchers and engineers have conducted extensive research on the deformation mode and failure mechanism of deep and large foundation pits, including the deformation prediction method of foundation pits and the estimation of ground settlement and horizontal displacement of wall. In order to reduce the influence of deep foundation pit excavation on the surrounding environment, the deformation of supporting structure needs to be strictly controlled. Based on the monitoring data of the deep foundation pit in a metro project of Shijiazhuang city in North China, this paper analyzes the deformation characteristics of the deep foundation pit under the condition of open excavation plus three steel supports, taking a two-story threespan box type underground frame structure station in Shijiazhuang city subway project as an example. In the energy conservation equation of the MSD method, the compression deformation energy of internal support is introduced to predict the deformation characteristics of foundation pit and compared with the measured value
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
