What is the basic principle for soil liquefaction

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Reference no: EM131681651 , Length: 1

Question 1. List 5 (each) possible methods for shallow and deep ground improvement methods.

Question 2. What are quality control and quality assurance? How are they different? And why are they important? What are the types of construction specifications possibly used in practice?

Question 3. Comparing two clay samples compacted according to standard Proctor procedure the same dry density, but at water contents below and above optimum, which of the following statements is most likely true:

a) The wetter soil is likely to have flocculated structure than dispersed soil structure
b) The wetter specimen will have higher unsoaked strength
c) The wetter sample will have higher stress-strain modulus
d) The wetter soil will have lower swelling potential

Question 4. The maximum dry density of a given soil is 1.5 g/cm3 and its specific gravity was determined to be 2.65. Determine the moisture content corresponding to this density on the zero air void curve. Also, determine the optimum moisture content of this soil if we know that the saturation at OMC was 95%.

Question 5. What is the basic principle for soil liquefaction? List five possible ground improvement methods that can be used to mitigate soil liquefaction and explain why and how.

Question 6. A fill material has 10% oversized particles. The compaction tests on the fill without oversized particles result in a maximum dry unit weight of 18.7 kN/m3 and its corresponding optimum moisture content of 12%. The oversized particles have specific gravity of 2.67 and saturated surface dry (SSD) moisture content of 3%. Calculate the corrected maximum dry unit weight and optimum moisture content including the oversized particles.

Question 7. Explain the four main mechanisms involved in dynamic consolidation.

Question 8. A four story hospital building is to constructed on a landfill that contained construction debris. The design indicates that shallow foundations can be used for this project provided a homogeneous soil layer with no voids could be ensured within a depth of 10 m below ground surface. Assume ground water table is deep enough that it is not a concern. Dynamic compaction was proposed to improve the ground. The local contractor doing dynamic compaction has a 15-ton tamper with a diameter of 1.5 m and thickness of 1.0 m. You are requested to conduct a preliminary design for this dynamic compaction project that includes drop height, spacing, number of passes and number of drops. Also, estimate the total settlement using the area ratio of improvement.

Question 9. Under what kind of condition will the punching failure through the replaced zone likely happen?

Question 10. A circular concrete footing of 1.5m in diameter has an embedment depth of 0.6m in a uniform loose sand.The column load on the footing is 300 kN. The loose sand has a unit weight of 16 kN/m³ and a frictionangle of 26°. The groundwater table is 10m below the ground surface. The required factor of safety is 3.0.

Calculate the ultimate bearing capacity and factor of safety against bearing failure. If a replaced zone of 2.5min diameter and 1.0mthick granular fillwith unit weight of 20 kN/m³, cohesion of 0, and friction angleof 40° is constructed under the footing, what are the ultimate bearing capacity and factor of safety for all four modes of failure?

Reference no: EM131681651

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