## 2 Project Background  
### Construction Site  
The Engineering Procurement Construction (EPC) of the Jiaojiang Xinhai Urban Shared Space Project is located in the core area of trade and commerce in Jiaojiang District, Taizhou City. It is bounded by Modern Avenue to the north, Central Avenue to the east at a distance of approximately 100 m, Hongjiachangpu to the south at a distance of approximately 200 m, and is relatively open to the west. The Hongjiachangpu River, which is approximately from 50 to 80 m wide, is located to the south of the site and has a water surface elevation of 2.8 m and a water depth of 1.5 to 2.0 m. The geomorphological unit of the site is a marine plain with convenient transportation. The west side of the site was formerly occupied by a plant which has been demolished, and the original building foundation has been excavated. The rest of the site is characterized by arable land. On the east side, a significant amount of construction waste has been accumulated, and the terrain is generally flat with slight local elevations.  
The total planned land area of the Jiaojiang Xinhai Urban Shared Space Project is approximately 79,022 m\({}^{2}\), and the total construction area is approximately 118,533 m\({}^{2}\). The above-ground part is divided into five plots, which are primarily composed of a number of two- to three-story commercial buildings with category C seismic protection. With the exceptions of Plot II (buildings 2-1# and 2-3#), Plot IV, and Plot V, the entire site features an integral basement with a basement floor elevation of \(-\)0.25 m. Table 1 provides a basic overview of the proposed building structure.  
\begin{table}
\begin{tabular}{c c c c c c c c} \hline \hline
**Plot** & **Building** & **Story** & \begin{tabular}{c} **Building** \\ **Height (m)** \\ \end{tabular} & \begin{tabular}{c} **Building Ground** \\ **Elevation (m)** \\ \end{tabular} & \begin{tabular}{c} **Outdoor Ground** \\ **Elevation (m)** \\ \end{tabular} & \begin{tabular}{c} **Structure** \\ **Elevation (m)** \\ \end{tabular} & \begin{tabular}{c} **Column** \\ **Load (kN)** \\ \end{tabular} & \begin{tabular}{c} **Proposed** \\ **Foundation** \\ \end{tabular} \\ \hline I & 1-1\#-1-5\# & 2F & 9.9 & & & & 5000 \\ \hline II & \begin{tabular}{c} 2-1\#, 2-4\#, \\ and 2-5\# \\ \end{tabular} & 2F & 11.9 & & & & 5000 \\ \hline  & 2-1\#, 2-3\# & 2F & 11.9 & & & & 3000 \\ \hline III & 3-1\#-3-5\# & 2F & 11.6 & & & 5000 \\ \hline IV & 4-1\# & 2F & 10.87 & & & 5000 \\ \hline V & \begin{tabular}{c} 5-1\#, 5-3\# \\ 5-2\# \\ \end{tabular} & 1-3F & 7.15-11.9 & & & & 3000 \\ \hline  & \
\begin{tabular}{c} Basement \\ \end{tabular} &
\begin{tabular}{c} \(-1\)F \\ \end{tabular} & / & / & / & / & 2100 \\ \hline \hline \end{tabular}
\end{table}
Table 1: Basic overview of the proposed construction list.  
The underground part of the Jiaojiang Xinhai Urban Shared Space Project features a pile foundation structure with an excavation size of 110 m by 700 m and a depth ranging from 3.8 to 6.05 m. The excavation constitutes a large-span deep foundation pit and employs the zoned excavation method supported by bored piles. The primary support system of the pit consists of a combination of bored piles and a water curtain of cement mixing piles.