Soil nailed wall Construction scheme of deep foundation pit support
l、 Project overview Xxxx culture and art, in the Haihu Road New District of xxxx, the project construction area is 4.02 hectares, and the building height is 35 meters. 2. Topography The proposed xxxx Culture and Art Center is located in the Haihu Road New Area under construction by xxx in xx City, and the site is located on the south bank of the Nishui River and north of the May 4th West Road. 3. Geological overview The main soil properties of the stratum are five series, from top to bottom: 1. Arable soil: brownish gray, mainly composed of silt, uneven soil, containing a small amount of plant roots and small gravel. Loose, underconsolidated, slightly wet. 2. Loess like soil: the gross soil shall be the backfilling soil of the original building core or the filling soil for leveling the ground in the site, which is light yellow or brownish gray, mainly silt, with local carbon chips and a small amount of construction waste, with low dry strength and toughness. 3. Pebble: variegated. For particles with particle size greater than 20mm, the parent rock is granite gneiss, the surface is strongly weathered, and occasionally contains boulders. The skeleton particles are not in contact with each other, arranged in a mixed manner, and the density is slightly dense. 4. The layer of strongly weathered mudstone is brownish red and greenish gray, which belongs to the clay rock formed by sedimentation. Most of its organizational structure has been destroyed, and its mineral composition has changed. The weathered mudstone is in the form of dry soil, occasionally containing gypsum, distributed unevenly in the form of stars, and softened when encountering water. 5. The layer is moderately weathered mudstone, brownish red, mainly argillaceous structure, layered structure, partially damaged structure, slightly developed weathering fissures, occasionally containing stones, distributed unevenly in the form of stars, and softened when encountering water. The groundwater on the site is of phreatic water type, and the aquifer is mainly composed of highly permeable pebble layer (partially round gravel). The second major source of groundwater supply is lateral runoff supply, followed by atmospheric precipitation. The buried depth of groundwater on the site is below 13.30~16.2 meters, so no precipitation treatment is required.
