A standard penetration test has been conducted on a coarse sand at a depth of 16 ft below the surface. The blow counts obtained in the field were as follows: 0-6 in. (4 blows), 6-12 in. (6 blows), and 12-18 in. (6 blows). The tests were conducted using a USA-style donut hammer in a 6 in. diameter boring using a standard sampler with the liner installed. The vertical effective stress at the test depth was 1500 lb.ft2. Determine N160-

A standard penetration test has been conducted on a coarse sand at a depth of 16 ft below the surface. The blow counts obtained in the field were as follows: 0-6 in. (4 blows), 6-12 in. (6 blows), and 12-18 in. (6 blows). The tests were conducted using a USA-style donut hammer in a 6 in. diameter boring using a standard sampler with the liner installed. The vertical effective stress at the test depth was 1500 lb.ft2. Determine N160-

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

See similar textbooks

Similar questions

A standard penetration test (SPT) is performed in a site at a depth of 8.0 m in sand of total unit weight 19.6kN/m3 and the following blow-count data was obtained in increments of 6 inches: 10, 10, 5. What is the N-value corrected for overburden effect to be reported on the bore log at this depth where SPT was performed?
An SPT test was conducted in a dry sand (no ground water table) with a unit weight of 18kN/m3. The drill rig used had an energy efficiency rating of 60%. The recorded blow counts were 6, 7 and 8. The depth of testing was 6 m. Use the Liao and Whitman (1986) correction for overburden stress to determine the corrected SPT value at this depth. N60=? CN=? (use 3 decimals) N1(60)=? (truncated to an integer value)
Describe about the sand-cone method and the rubber-balloon method.
In the above figure, the standard penetration test was carried out at a depth of z = 2 m on the sand ground under the foundation base and the obtained SPT N60 value was determined as 21. Calculate the corrected (N1) 60 value at z = 2m depth under the foundation base.At the same time, calculate the elastic settlement in the center of the foundation, the value of Se, using the elastic theory and Hooke's rule on the sand ground in the figure.Take the average Es value for the whole sand layer as 12000 kN / m2. Take the value of the depth factor If as 0.85. According to the results you have calculated, which of the following (N1) gives the values of 60 and elastic settlement, Se.
Define the Normalized Tip Resistance of Drilled Shafts in Sand (Ghionna et al. 1994) ?
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 undertain 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 stress ratio, CSR. Express your…
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 undertain 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…
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…
An 8 in diameter drilled shaft will penetrate through an expansive stiff clay to a depth well below the active zone. It will carry a downward load of 5,200 lb. The undrained shear strength of the clay is 900 psf and the active zone extends to a depth of 10 ft. Determine the following:a. What is the uplift skin friction load?b. Is a tensile failure in the shaft possible (do not forget to consider the weight of the shaft)?c. What is the required reinforcing steel to prevent a tensile failure (if necessary)? Use fy = 40 k/in2 and a load factor of 1.7.
Q A water tank of 5 metres broad by 20 metres long is to be built at a depth of 0.8 metres below ground. The tank's water is 75 metres deep. A loose, medium-dense, typically cemented sand was visible in the bonings, and the water table was 2 metres below the surface. Plotted in below Fig.are standard penetration tests conducted in the boreholes. Verify that the service-ability limit states and the ultimate limit are not exceeded.
An 8 in diameter drilled shaft will penetrate through an expansive stiff clay to a depth well below the active zone. It will carry a downward load of 5,200 lb. The undrained shear strength of the clay is 900 psf and the active zone extends to a depth of 10 ft. Determine the following: What is the uplift skin friction load? Is a tensile failure in the shaft possible (do not forget to consider the weight of the shaft)? assume: unit weight concrete = 150pcf, Concrete has no tensile strength. Assume full active zone in calculations.
Describe the procedure of he constant-rate-of-penetration test.