4- Based on geotechnical studies performed on a sand deposit, the following results have been obtained for standard penetration test numbers (N60) at any depth. Groundwater level is measured 2 meters below ground level. Dry specific gravity of sand 17.6 kN / m3 and specific gravity of sand saturation 19.6 kN / g Cubic meters are obtained. For an earthquake of magnitude 8.25, determine whether liquefaction occurs at any level. The maximum acceleration is considered to be 0.259 = dmax. May DEPTH (M) N60 (BLOWS/30CM) 7 11 12 14 18 21

4- Based on geotechnical studies performed on a sand deposit, the following results have been obtained for standard penetration test numbers (N60) at any depth. Groundwater level is measured 2 meters below ground level. Dry specific gravity of sand 17.6 kN / m3 and specific gravity of sand saturation 19.6 kN / g Cubic meters are obtained. For an earthquake of magnitude 8.25, determine whether liquefaction occurs at any level. The maximum acceleration is considered to be 0.259 = dmax. May DEPTH (M) N60 (BLOWS/30CM) 7 11 12 14 18 21

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Q.
A sand deposit has been identified beneath a site located adjacent to a river. The sand deposit is 30 feet thick and the top of the layer is 24 feet below the ground surface and overlain by a very stiff clay and is underlain by bedrock. The water level has been measured to be at a depth of 30 feet. The standard penetration resistance of the layer has been determined to be 20 blows per foot and a sampler without liners was used; a drill rig with a safety hammer with an efficiency of 60% was used. The length of the drill rod is 5 meters and the borehole diameter is 7.87 inches (200 mm). The design earthquake has been designated as a moment magnitude 7.5 event on a nearby fault and the maximum ground acceleration is expected to be 0.60 g. The wet unit weight of the clay soils is 200 pounds per cubic foot and the wet unit weight of the sand soils is 250 pounds per cubic foot. The sands have 45% fines content according to a grain size analysis. Determine the cyclic stress ratio, CSR.…
(e) A soil profile consists of a clay layer between layers of sand, the water table being in theupper sand layer. Before the construction of a raft foundation for a large reservoir, piezometers were placed in the saturated clay layer. The whole process of filling the reservoir may be approximated to applying rapidly a single pressure increment of 200 kPa uniformly throughout the clay layer. One year after filling the reservoir, the piezometers indicated a distribution of excess porewater pressure as indicated in Figure Q-e. Estimate the average degree of consolidation at this time.
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2. SPT test was performed at a shallow site composed of uniform granular soil with a unit weight = 20 kN/m³ (shown below are N60). a) Convert to (N1)60. b) Estimate the range of friction angles at depths between 20 and 40 ft. Use various correlations. Compare the differences. SPT N-values (bpf) 10 20 30 40 50 10 Silty Sand (SM): Piedmont Residuum 30 40 50 60 Depth (feet)
Solve using 3 methods: 1 - Bazaraa Method 2 - Peck method 3 - Liao - Whitman method
Question:- A new building is proposed with a deep basement (10 meters below ground level) to be placed on rock. Borings indicated glacial till (4 meters deep on average) over shale. The shale is of varying hardness, so a seismic refraction survey was done. The results showed the shale has a seismic velocity of less than 1 km/sec except for a 30 cm thick layer at 8 meters below the surface. The seismic velocity of that layers is 3.5 km/sec. Provide a couple of recommendations for dealing with this layer. (Note that the shale can support the building without any structural issues.)
A piezocone test was carried out at a site, and the following readings were recorded for the cone resistance q, and sleeve friction f.. Determine the soil present at these depths. Cone resistance, Sleeve friction, Depth (m) 9. (MN/m?) f. (kN/m?) 0.21 12.5 10 1.05 40.5 15 3.23 75.2 20 9.66 60.7 25 12.50 62.5
A sand deposit has been identified beneath a site located adjacent to a river. The sand deposit is 15 feet thick and the top of the layer is 12 feet below the ground surface and overlain by a very stiff clay and is underlain by bedrock. The water level has been measured to be at a depth of 10 feet. The standard penetration resistance of the layer has been determined to be 12 blows per foot and a standard sampler was used; a drill rig with a safety hammer with an efficiency of 60% was used. The length of the drill rod is 10 meters and the borehole diameter is 5 inches (127 mm). The design earthquake has been designated as a moment magnitude 6-3/4 event on a nearby fault and the maximum ground acceleration is expected to be 0.40 g. The wet unit weight of the clay soils is 150 pounds per cubic foot and the wet unit weight of the sand soils is 180 pounds per cubic foot. The sands have 35% fines content according to a grain size analysis. Determine the cyclic resistance ratio, CRR. Use this…
SPT tests were carried out in the silty sand layer at 3 m, 9 m and 12 m depths from the ground surface. Energy ratio has been accepted as 60%. The number of strokes for the experiment are listed below. Groundwater level is 2 m below ground level. Dry and water-saturated unit volume weights of the soil were determined as 18 kN / m3 and 19 kN / m3, respectively. Depth from the surface, (m) SPT-N60 3 4-6-8 9 7 -9-11 12 10-11-13 Which of the following is the corrected (N1) 60 value at a depth of 12 meters