Abstract
Saturated soft loess has a large pore structure, high compressibility, low strength, fluid plastic state, and poor engineering properties. It is still one of the key problems that engineering needs to solve. In order to study the influence of deep foundation pit excavation in the saturated soft loess area on the deformation of foundation pits, the deformation laws of ground settlement, enclosure structure, and supporting axial force were clarified based on the field tests on the deformation characteristics of deep foundation pits in areas with the high-water level in saturated soft loess, combined with geological conditions and on-site construction procedures. The results indicate the following: water supply and construction process were found to be the main factor in changing the surface settlement curve of deep foundation pits in saturated soft loess; increasing the construction speed of the pit bottom floor, inverted braces, floor frame beams, and sidewall frame beams to close the structure, which is conducive to restraining the deformation of the continuous underground wall and foundation pits in similar areas. In the initial stage of support layout, the axial force of steel support tends to increase too fast or even exceed the standard control value. Therefore, a reasonable preadding axial force is an effective means to control the deformation of the continuous underground wall and the axial force of the steel support. The current research results may provide a reference for constructing deep foundation pits in similar areas.
Highlights
Loess is a kind of yellow silt sediment that is transported by wind
GZC4-8 GZC5-8 (c) excavation, it is necessary to speed up the deployment of the steel support and increase the monitoring frequency to prevent the smaller number of tracks from increasing the value of the rest of the supporting axis
It analyzes the changes in the ground surface settlement, the horizontal deformation of the diaphragm wall, and the excavation depth. e relationships between the surface settlement and the horizontal deformation of the diaphragm wall and the axial force of the steel support provide a reference for the construction plan for the deep foundation pit excavation in the saturated soft loess area
Summary
Loess is a kind of yellow silt sediment that is transported by wind Analysis of monitoring data has become an effective way to understand deep foundation pits’ deformation laws in saturated soft loess. Many scholars have analyzed the monitoring of different types of deep foundation pits in loess and soft soil areas. There is less monitoring and analysis of deep foundation pit construction in saturated soft loess areas with high-water levels. Erefore, this article aimed to analyze and study the deformation laws between the groundwater level, the ground surface, continuous underground walls, and internal supports during the construction of deep and high-level foundation pits in saturated soft loess. There is less monitoring and analysis of deep foundation pit construction in saturated soft loess areas with high-water levels. erefore, this article aimed to analyze and study the deformation laws between the groundwater level, the ground surface, continuous underground walls, and internal supports during the construction of deep and high-level foundation pits in saturated soft loess. e results can provide references for the excavation and the deformation prevention measures of deep foundation pits in similar saturated soft loess areas to ensure the safety and stability of the foundation pit
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