What is the natural period of a layered soil with medium gravel of depth 40m? Is it safe to build a multi-storey building with fundamental period of vibration equal to 1.5 seconds, as that displayed in the figure below, on a site with the above soil type? Is this site more suitable for a particular type of structure shown below? T=1.5 secs T=4.5 secs T=0.2 secs V-780 m es T= ? H=40m

What is the natural period of a layered soil with medium gravel of depth 40m? Is it safe to build a multi-storey building with fundamental period of vibration equal to 1.5 seconds, as that displayed in the figure below, on a site with the above soil type? Is this site more suitable for a particular type of structure shown below? T=1.5 secs T=4.5 secs T=0.2 secs V-780 m es T= ? H=40m

Fundamentals of Geotechnical Engineering (MindTap Course List)

5th Edition

ISBN:9781305635180

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter8: Stresses In A Soil Mass

Section: Chapter Questions

Problem 8.10P: The soil profile at a site consists of 10 m of gravelly sand underlain by a soft clay layer. The...

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The soil profile at a site consists of 10 m of gravelly sand underlain by a soft clay layer. The water table lies 1 m below the ground level. The moist and saturated unit weights of the gravelly sand are 17.0 kN/m3 and 20.0 kN/m3, respectively. Due to some ongoing construction work, it is proposed to lower the water table to 3 m below the ground level. What will be the change in the effective stress on top of the soft clay layer?
4. (a) Time required for a 3m clay layer, sitting on bedrock, and overlain by a sand layer to fully consolidate is 4 years. What if the clay layer was on a sand layer or another stiff clay layer? Please explain (with reasoning) how the time required for the consolidation process to complete is likely to be affected in either case (no calculations required to be shown).
Define the term critical void ratio.
Is it possible for some soils to be expansive when the normal stress is low, and collapsible when it is high? Explain.
A bed consists of compressible clay of 4 m thickness with pervious sand on top and impervious rock at the bottom. In a consolidation test on an undisturbed specimen of clay from this deposit 90% settlement was reached in 4 hours. The specimen was 20 mm thick. The time for the building founded over this deposit to reach 90% of its final settlement will be?
Soil borings made at a site in city indicate that the top 6 m is a loose sand and miscellaneous fill, with the groundwater table at 3 m below the ground surface. Below this is a fairly soft blue-gray silty-clay with an average water content of 30 %. The boring was terminated at 16 m below the ground surface when fairly stiff silty clay was encountered. Make reasonable assumptions as to soil properties and calculate the total, water, and effective stresses at 3, 6, 11, and 16 m below the ground surface.
A compressible, normally consolidated clay layer is 6 ft thick and the slope of its field consolidation line is 0.21. If the initial void ratio is 0.47 and the effective overburden pressure is 3.6 tons/ft^2, what is the primary consolidation at midheight of the clay layer if the additional pressure from the building is 1.7 tons/ft^2? Give an answer in inches to 3 decimal places. Type your answer...
layer. 2. A project with excavation and construction stages will take place at your site. The profile contains a saturated clay On March 1, the effective stress at point A (in the middle of the clay layer) is 150 kPa, and the overconsolidation ratio is 1. On April 1, the effective stress at point A is 140 kPa. On May 1, the effective overconsolidation ratio on May 1? Show your work and circle your answer. stress at point A is 290 kPa. What is the
Civil Engineering Two near-surface strata of the same soft clay are to be consolidated. In one the consolidation is to be done by placement of a surcharge fill at the ground surface. In the other, the consolidation is to be effected by lowering the water table to the bottom of the clay layer and evaporation of water from the ground surface, which will cause shrinkage of the clay. The ground water table is initially at the top of the clay stratum. Show profiles of effective stress and water pressure versus depth for each stratum corresponding to the condition where the vertical effective stress is the same in each at middepth. Will the clay structure be the same in each stratum at this depth at this time? Why?
Shear Stress 5. Please provide proper discussion and illustration. Clear and complete solution please thank you. A clay soil has an undrained shear strength (cohesion, Cu) of 800 psf. How could the strength of this soil be increased?
A 5.1 m thick clay soil with a current overburden pressure of 89 kPa is going to experience an additional stress of 89 kPa after a new structure is built. If it was determined that the clay is normally consolidated has an initial void ratio of 1.2, a recompression index of 0.07, and a compression index of 0.47. Determine the total amount of settlement that is expected to occur. Provide your answer in meters to 3 decimal places.
Why is it important to minimize disturbance to soil samples that are going to undergo consolidation testing? Why would it be important to obtain an accurate estimate of the preconsolidation stress?