Construction organization design of foundation pit soil nailing wall support and dewatering

Uploaded on: 2018-05-28 16:50:49 come from: Road and bridge municipal administration / Road and bridge construction design / Construction organization design

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The total land area is 27196m2, and the total building area is 134648.4m2. The main buildings are a new district management committee office building and a five-star hotel, which are twin towers (about 99.1m high), supporting facilities and underground garage. According to the design drawings, there are two underground floors within the scope of the buildings to be built. The frame line of the outdoor wall of the basement is basically trapezoidal, about 150m long in the north, about 208m long in the south, and about 100m wide in the foundation pit. See the following table for the main buildings. List of main buildings Floor number Floor number Structure type Foundation form Remarks Office part - 2/23 frame shear pile foundation bottom elevation - 11.8m, local deep pit - 14.85m Hotel part - 2/24 frame shear pile foundation bottom elevation - 11.8m, local deep pit - 14.85m podium - 2/4 frame natural foundation or pile foundation bottom elevation - 11.1m, Local deep pit - 12.6m underground garage - 2 frame natural foundation bottom elevation is -11.1m, local deep pit - 12.6m architectural design ± 0.000m elevation is equivalent to the absolute elevation of 5.55m, the existing site elevation is about 3.6m, and the excavation depth of foundation pit is mostly about 9.5m. According to the geological report, The distribution of main soil layers under the foundation pit is shown in the following table: List of soil layer parameters in the foundation pit Surface layer number Geotechnical name Average thickness Weight r UU Unconsolidated undrained Cq Consolidated undrained permeability coefficient Bearing capacity fak m KN/m3 Ck (KPa) ф k (°) Ck (KPa) ф k (°) Kv (cm/s) Kh (cm/s) KPa 1 cultivated soil 1 5 5 2 silty clay 4 19.4 66 4.2 43 17.0 3.13E-07 3.30E-07 240 3 silty clay mixed with silt 2.7 18.8 29 4.7 25 23.7 1.38E-05 2.68E-05 150 4-1 silty clay mixed with silt 5.5 18.3 16 5.6 19 17.6 1.51E-05 1.96E-05 120 4-2 silty clay 3.3 18.4 15 6.3 14 15.5 4.41E-06 4.58E-06 100 5-1 silty clay 2.3 19.1 55 3.7 43 16.0 1.71E-06 1.37E-06 220 5- 2 Silty clay 4.2 19.7 77 4.1 45 17.9 3.65E-07 4.08E-07 260

Construction organization design of foundation pit soil nailing wall support and dewatering - Figure 1

Construction organization design of foundation pit soil nailing wall support and dewatering - Figure 2

Construction organization design of foundation pit soil nailing wall support and dewatering - Figure 3

Construction organization design of foundation pit soil nailing wall support and dewatering - Figure 4

Construction organization design of foundation pit soil nailing wall support and dewatering - Figure 5

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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 phreatic water, and the aquifer is mainly composed of highly permeable pebble layer (partially round gravel). The second major source of groundwater is lateral runoff recharge, 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.

Topic: Special construction scheme for foundation pit of soil nailing wall Deep foundation pit soil nailing wall support Design of soil nailing wall support for foundation pit