test the depth were 13, ively. hammer was a US donut hammer. The borehole diameter was 8" and a standard sampler was used. The soil was observed to be well graded coarse sand. The groundwater table was observed at a depth of 10 ft below the ground surface. (a) Determine the corrected N60 and (N1)60 Values (b) Using (N1)60 value obtained in part (a), calculate the relative density of the sand (OCR = 1.5, age of soil is 400 years) %3D

test the depth were 13, ively. hammer was a US donut hammer. The borehole diameter was 8" and a standard sampler was used. The soil was observed to be well graded coarse sand. The groundwater table was observed at a depth of 10 ft below the ground surface. (a) Determine the corrected N60 and (N1)60 Values (b) Using (N1)60 value obtained in part (a), calculate the relative density of the sand (OCR = 1.5, age of soil is 400 years) %3D

Principles of Foundation Engineering (MindTap Course List)

9th Edition

ISBN:9781337705028

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter3: Natural Soil Deposits And Subsoil Exploration

Section: Chapter Questions

Problem 3.14P

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A 6 in diameter exploratory boring has been drilled through a fine sand to a depth of 19 ft. An SPT N-value of 23 was obtained at this depth using a USA safety hammer with a stan-dard sampler. The boring then continued to greater depths, eventually encountering the groundwater table at a depth of 35 ft. The unit weight of the sand is unknown. ComputeN1,60, f′, and Dr at the test location, and use this data to classify the consistency of thesand.
A standard penetration test was conducted at a site 12 m below the earth's surface. The observed SPT number was 26. The water table is at the ground surface, the soil investigation shows specific gravity of solids to be 2.65 and void ratio to be 0.60. The final SPT number is? A B D 20 23 31 41
Date: 12/20/20 1. The site investigation results below are for a site with sand and gravel above 18 ft and a clayey sand soil below. The upper sand and gravel layer has an average wet unit weight of 105 pcf and the clayey sand has an average unit weight of 112 pef. The standard penetration test was conducted using a safety hammer and a 2.5 in. diameter standard sampler with the results provided in the following table. Note any assumptions. Depth Blows/6 in. Notes ft 0-6 6-12 12-18 2.5-4 8 7.5-9 12 12 15 15-16.5 18 18 20 21 21 19 Water table at 18 17-18.5 25-26.5 35-36.5 40 25 25 25 30 30 35 100 Refusal Estimate the frietion angle indicated for a foundation located 5 ft below grade. a.
A standard penetration test was performed in a 150 mm diameter boring at a depth of 9.5 m be-low the ground surface. The driller used a UK-style automatic trip hammer and a standard SPT sampler. The actual blow count, N, was 19. The soil is a normally consolidated fine sand witha unit weight of 18.0 kN/m3 and D50 = 0.4 mm. The groundwater table is at a depth of 15 m. Determine the following:a. N60b. N1,60c. Drd. Consistency (based on Table 3.3)e. f′
An SPT was performed at a depth of 7 m in sand of unit weight 20.40 kN/m3. The groundwater is located 2 m below the ground surface. The N-value was found to be 22. Compute the corrected N-value by the three methods: (Bazaraa method, Peck method, Liao and Whitman Method)
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. Compute the factor of safety against liquefaction of…
CVLE351 Soil Mechanics Laboratory Assignment 2 (due 30 December 2021) 1. DIRECT SHEAR TEST (DST) (a) Explain the test procedure briefly and sketch the test set up. (b) The following readings were taken in two sets of tests (under normal load N= 390 N and N2= 750 N) using a shear box of 60 mm x 60 mm in cross-sectional area containing a specimen of dry sand: i. Plot the vertical displacement against the horizontal displacement ii. Plot the shearing resistance against hprizontal displacement iii. Determine the peak (o'peak) and critical state (o'er) angle of internal frictions. iv. Explain what is dilatancy and determine the angle of dilation (w) in both tests. TEST 1 Normal Load P 390 N Horizontal T (kN) t (kPa) Vertical displacement displacement (mm) 0. (mm) 0.1615 -0.030 2. 0.258 -0.020 3 0.291 0.140 4. 0.276 0.348 5. 0.239 0.437 6. 0.2325 TEST 2 0.462 Normal Load
Q2/A standard penetration test was performed in a 150 mm diameter borehole at a depth of 9.5 m below the ground surface. The driller used a UK-style automatic trip hammer, a standard SPT sampler and a 10-m drill rod. The blow counts obtained in the field were as follows: 0-150mm = 4 blows: 150-300mm = 7 blows; 300-450mm = 12 blows. The soil is normally consolidated fine sand with a unit weight of 18.0 kN/m³ and D50 = 0.4 mm. The ground water table is at a depth of 15 m. Compute: (a) N60, (b) (N1)60, (c) D.%, (d) , and (e) denseness of the fine sand.
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…
Given A standard penetration test (SPT) was performed at a depth of 3.75 m below the ground surface in a silty sandy soil. Geotechnical tests show the unit weight to of the soil to be 20.72 kN/m³. The blow counts recorded using a 24 in. sampler were 13/19/26/16. Required Determine the corrected N-value using the N' method, to the nearest whole number. Answer:
FUNDAMENTALS OF GEOTECHNICAL ANALYSIS During a Standard Penetration Test on silty clay soil, blow counts of 7, 11 & 16 were recorded for the 1st, 2nd, and 3rd, with 6-inch intervals of an 18-inch split spoon. a) What is the N value? and, b) What is the consistency of the soil?
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 magnitude scaling factor, MSF. Express…