11 Questions
What is the minimum depth for buildings and how is it determined?
The minimum depth is 10 meters, which is chosen at a depth where stresses from the building reach 10% of the effective in-situ stress.
What is the minimum depth for pile foundations?
The minimum depth is 5 meters below the expected tip of the pile.
What are the main parameters obtained from a Pressuremeter Test?
The main parameters obtained are the Pressuremeter Modulus (Ep) and the Limiting Pressure (Pl).
What information is typically included in a borehole log for cohesive soil?
The information typically includes a description of the consistency, color, and other constituents of the soil.
What information is typically included in a borehole log for cohesionless soil?
The information typically includes a description of the relative density, gradation, and color of the soil.
What are the main purposes of subsurface investigation in construction?
Obtaining information on soil strata and their classification, determining the index and engineering properties of the soil layer, determining groundwater level, identifying problematic soil, selecting the type of foundation and construction method, and determining allowable bearing capacity and expected settlement.
What are the common methods used for subsurface investigation?
Excavation of open pits with sampling and testing, drilling of boreholes with sampling and testing, soundings without sampling, and surface geophysical methods.
What is the main method used in Egypt for subsurface investigation?
Drilling of boreholes with sampling and testing.
What is the suitable number of boreholes required for normal buildings?
One borehole for every 300 m2 of built-up area, with a minimum of 2 boreholes per site.
What factors affect the suitable depth of boreholes in subsurface investigation?
Soil conditions, dimensions of the building, and loads from the building.
What is the purpose of determining the groundwater level in subsurface investigation?
To identify the potential impact of groundwater on the foundation and construction of the building or structure.
Test your knowledge of subsurface investigation purposes and methods, including obtaining soil information, determining groundwater levels, and selecting foundation types. Identify the role of excavation, drilling, and other techniques in soil analysis. Improve your understanding of this critical step in construction and building design.
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