Abstract
The complex engineering geological conditions and the surrounding environmental conditions of the existing subway lines and adjacent buildings have significantly deepened the difficulty of metro station foundation pit design and construction. Based on the foundation pit project of Luboyuan Station of Nanjing Metro Line 9, this study chooses a reasonable foundation pit support design scheme to carry out related research by analyzing the site geological environmental conditions. Through the analysis and evaluation of the engineering geological conditions of the engineering site, the engineering geological problems that may occur in the process of construction are given. According to the lithologic characteristics of the site strata, the hydrogeological conditions, and the features of the underground engineering structure, the design of the foundation pit supporting system is optimized and analyzed. The results show that making full use of the geological features of strata and adopting effective support methods can ensure the safety of foundation pit construction, reduce the cost of engineering description, and shorten the construction period, which can be used as a reference for similar projects and construction.
Highlights
With the high development of urbanization, the high concentration of population, and the rapid growth of motor vehicle ownership, the phenomenon of urban traffic congestion is becoming more and more serious
In this study, taking the foundation pit design of Luboyuan Station in the fourth project of Nanjing Metro Line 9 as an example, through the analysis and evaluation of the engineering geological conditions of the project site, this study gives the engineering geological problems that may occur in the process of construction
According to the above analysis, based on the foundation pit deformation control standard in Nanjing, the results show that the bearing capacity and deformation of the supporting structure are within the allowable range, so the support scheme is feasible for the project
Summary
With the high development of urbanization, the high concentration of population, and the rapid growth of motor vehicle ownership, the phenomenon of urban traffic congestion is becoming more and more serious. Taking the deep foundation pits of 48 subway stations collected in Nanjing, for example, only 21 foundation pits are protected by underground diaphragm walls, bored piles cover another 26, and one project uses SMW piles [25, 26]. Most of the projects that select diaphragm walls as bottomless foundation pit retaining structures are located in the floodplain of the Yangtze River and the ancient channel of the Qinhuai River. It is imperative to make rational use of the geological structure characteristics of rock and soil and the surrounding environmental conditions to reduce the project cost-effectively, solve the technical problems of foundation pit construction, and speed up the construction speed and other factors [27, 28]. According to the onsite lithologic characteristics of strata, the hydrogeological conditions, and the structural elements of underground engineering, the design of the foundation pit supporting structure is optimized and analyzed
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