Concept explainers
A two-story reinforced concrete building is to be built on a vacant parcel of land. This building will be 100 ft wide and 200 ft long. Based on information from Other borings on adjacent properties, you are reasonably certain that the soils below a depth of 5 to 8 ft (1.5 - 2.5 m) are strong and relatively incompressible. However, the upper soils are questionable because several uncompacted fills have been found in the neighborhood. Not only are these uncompacted fills loose, they have often contained various debris such as wood, rocks, and miscellaneous trash. However, none of these deleterious materials is present at the ground surface at this site. Plan a site investigation program for this project and present your plan in the form of written instructions to your field crew. This plan should include specific instructions regarding what to do, where to do it, and any special instructions. You should presume that the field crew is experienced in soil investigation work, but is completely unfamiliar with this site.
Want to see the full answer?
Check out a sample textbook solutionChapter 4 Solutions
Foundation Design: Principles and Practices (3rd Edition)
Additional Engineering Textbook Solutions
Materials for Civil and Construction Engineers (4th Edition)
Structural Steel Design (6th Edition)
Structural Analysis (10th Edition)
Elementary Surveying (14th Edition)
Elementary Surveying: An Introduction To Geomatics (15th Edition)
- What is unconsolidated-un drained test? Explain the practical applications of CD analysis of Clay. Both answers should be in your own wordsarrow_forwardThe 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_forwardQ2) A temporary fill of 253 kN/m² was placed on the surface of the soil shown in figure below. After final consolidation was achieved, the fill got removed and a circular footing, 5.5m in diameter was constructed at 1m below the ground surface. Estimate: i. Total consolidation settlement due to fill. Total consolidation settlement after 85 days of fill application. iii. Total heave (expansion) of the soil surface after of the fill was removed. iv. Total consolidation settlement due to footing when uniform pressure of 103 kN/m² on the footing surface. W.T N.G.S 4m Sand Y sat. 18.5 kN/m³ 5m clay Ysat. 19 kN/m',OCR-1 C-3.533 m/month e-0.95, C-0.3, C,-0.05 Rockarrow_forward
- A developer plans to extend Bayview Haven residential estate in Darwin by constructing a 3.5mm fill platform over very soft mangrove silty clay soils. Borehole drilling indicates the very soft clay soils are 5m thick and underlain by rock of extremely low permeability, with the water table at the ground surface. Laboratory testing indicates the following geotechnical properties of the soils: • Very Soft Silty Clay: Degree of saturation - 100%, Coefficient of Volume Compressibility (m.) - 0.85 MPa', coefficient of consolidation of clay (c.) = 2.5 m/yr; dry unit weight - 13 kN/m', moisture content - 38%. Compacted fill: bulk unit weight = 22 kN/m'. (a) Estimate the final consolidation settlement (s.) of the clay layer AM (b) Estimate the consolidation settlement after 14.5 months (c) How long will it take the silty clay layer to reach 90% consolidation, in years. (d) If the silty clay has an overconsolidation ratio (OCR) of 1.5, what is the preconsolidation pressure at the midpoint of…arrow_forwardIn what type of soils can you perform the consolidated drained test? What shear strength parameters can you obtain if you perform this test, depending on the duration of the construction?arrow_forwardA saturated clay encountered in a deep excavation is found to have a water content of 23.5%. Determine its porosity and (saturated) unit weight.arrow_forward
- A new retail store is being planned for a site that contains 20 feet of soft clay underlain by impermeable bedrock. The coefficient of consolidation for the clay is 0.25 ft /day. The groundwater table is at the ground surface. Ten feet of sandy fill with a total unit weight of 120 pcf is placed at the site as a working platform for construction. Determine the excess pore pressure at a depth of 5 feet above the bedrock three years after the fill is placed. 3.arrow_forwardPlease answer fast I will upvote surearrow_forwardSimilar to Question 3, a square footing supporting a column applies a uniform pressure of 100 kPa on top of a deep clay deposit. Consider that only primary consolidation settlements apply for this question. Which of the following statements are correct (select all that apply)? A.Similar to Question 3, a square footing supporting a column applies a uniform pressure of 100 kPa on top of a deep clay deposit. Consider that only primary consolidation settlements apply for this question. Which of the following statements are correct (select all that apply)? B.One month after construction, the consolidation ratio within a soil element centered at point B should be lower than the consolidation ratio within a soil element centered at point C. C.When the excess pore water pressures are fully dissipated throughout the entire clay layer, the volumetric strain developed within a soil element centered at Point B is greater than the volumetric strain developed within a soil element centered at Point…arrow_forward
- silty clay encountered in a deep excavation is found to have a moisture content of 20%. Guess its void ratio and bulk density remarking on your assumption .arrow_forwardQuestion#1: Explain the Tri axial Shear test in your own words. Question#2: Describe the practical applications of consolidated-drained analysis for clay soil. Kindly solve both questionsarrow_forwardHand written solution is not allowedarrow_forward
- Principles of Geotechnical Engineering (MindTap C...Civil EngineeringISBN:9781305970939Author:Braja M. Das, Khaled SobhanPublisher:Cengage Learning