A five-story office building is to be built on a site underlain by moderately uniform soils. Bedrock is at a depth of over 200 m. This building will be 50 m wide and 85 m long, and the foundations will be founded at a depth of 1 m below the ground surface. Determine the required number and depth of the exploratory borings.
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- A large building is to be built on a thick layer of normally consolidated clay shown in the figure below. The building is to be placed at the bottom of a 4 m deep excavation, which will correspond to 1 level of parking garages. The water table remains 4 m below the ground surface during the entire process. Find the OCR in the middle of the clay layer at Point A, a long time after excavation and before construction of the building. (Answer tolerance = 2%).arrow_forwardPlease help me in answering the following practice questionsAt a site, it is planned that a circular grain silo will be constructed at the ground surface. The grain silo will be set on a rigid circular foundation that has a diameter of 6 meters. Assume that the silo will apply a concentric vertical load Q on top of the circular foundation and that the foundation will transfer this load to the top of the silty clay layer as a uniform vertical pressure q. The soil profile at this site is as follows (also shown in attached image): 9-m-deep silty clay layer underlain by bedrock Groundwater table located at a depth of 6 m from the horizontal ground surface, groundwater condition is hydrostatic. Silty clay layer Air-entry value (AEV) = 120 kPa Specific gravity GS = 2.72 Porosity n = 0.42 Average undrained shear strength su = 40 kPa Critical state friction angle Φ'C= 24 degrees (a) How can I compute pore-water pressure, total vertical stress, and effective vertical stress at point P…arrow_forwardDiscuss the importance of proper backfilling and compaction in excavation projects?arrow_forward
- please answer asap The column footing has been subjected to the ground surface. The clay layer has a unit weight of20.26 kN/m3 and has a thickness of 4.5 meters and is overlain by the sand layer with a unit weight of 15.17 kN/m3 and has a thickness of 3.5 meters. The location of the water table is 2 meters below the ground surface. If the sand layer is saturated, its unit weight becomes 18.45 kN/m3.Determine the following: The normal consolidation settlement if the footing (2.5 m × 4 m) has a load of 650 kN. The normal consolidation settlement if the footing (2 m x 3.5 m) has a load of 750arrow_forwardThe procedure of designing spread footing foundations on the basis of field exploration data (standard penetration test, cone penetrometer results, etc.) offers some practical benefits. What are the advantages of this method?arrow_forwardFor the first series of tests, no drainage of pore water occurs, either when the normal load is applied or during shearing (relating to clay’s very low coefficient of permeability). How does the “no drainage” control can be visualized?arrow_forward
- State the method to determine the N-value of soil and the normal N-value required for supporting friction pilesarrow_forwardWhat is Dynamic Deep Compaction/Consolidation?arrow_forwardsite investigation is to be made for 2500kn load carried on (3.0m x 2.0m) footing. The foundation will be built in layered soil as shown in figure. Estimate the depth of the bore hole. check image for complete informationarrow_forward
- The 20ft high clay fill shown below is proposed to be constructed over a layer of soft clay. A 5ft gravel layer is placed above the soft clay in order to facilitate drainage, assume it has the same unit weight as dense gravel. Answer the following: What is the magnitude of the settlement one year after the construction begins? What is the effective stress at Point A one year after construction begins if Point A is 25 feet below the GWT?arrow_forwardAn embankment is to be constructed for a certain project, as such filling materials are required to be excavated from borrow pits. The moist unit weight of the undisturbed soil is 20 kN/m3 and its water content is 10%. In order to build a 5 m high embankment with top width 2 m and side slopes 1:1, estimate the quantity of earth required to be excavated per meter length of embankment. The dry unit weight required in the embankment is 17 kN/m3 with a moisture content of 12%. Assume the specific gravity of solids as 2.65.arrow_forwardAn exploratory drill hole was made in a stiff saturated clay having a moisture content of 38.9% and Gs = 2.34 as shown in the figure. The sand layer underlying the clay was observed to be under artesian pressure. Water in the drill hole rose to a height of 13.8 ft above the top of sand layer. If an open excavation is to be made in the clay, determine the (a) unit weight of the clay, and the (b) maximum cut before the bottom heaves.arrow_forward
- Principles of Geotechnical Engineering (MindTap C...Civil EngineeringISBN:9781305970939Author:Braja M. Das, Khaled SobhanPublisher:Cengage Learning