3. Standard Penetration number pertains to the number of blows to drive the sampler last two 150mm intervals. Given the summary of soil investigation report, determine the SP number. Soil Classification/Description Brown, Fine Medium Sand Red, Brown Clay Gray, fine to coarse sand Depth 1.1m Blow Count, N 3-4 - 4 7 -8 -7 9 – 12 - 11 2.6m 3.9m

3. Standard Penetration number pertains to the number of blows to drive the sampler last two 150mm intervals. Given the summary of soil investigation report, determine the SP number. Soil Classification/Description Brown, Fine Medium Sand Red, Brown Clay Gray, fine to coarse sand Depth 1.1m Blow Count, N 3-4 - 4 7 -8 -7 9 – 12 - 11 2.6m 3.9m

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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Soil borings for the subsurface investigation of a site indicate a deep deposit of sandy soils. At one boring location, the blow count logged for the standard penetration test, N60, while sampling at a depth of 25 feet was 22 blows/ft. The sand has a unit weight of 115 pcf. Using criteria that relate SPT results and the soil angle of internal friction, estimate the value of f for the sand at the sample depth.
Q3/A- Choose the correct answer 1. Subsurface exploration is necessary for (a) selecting the type and depth of foundation for a given structure. (b) evaluating the load-bearing capacity of the foundation. (c) estimating the probable settlement of the foundation. (d) all of the above. 2. The approximate spacing of boreholes for highway projects is (a) 10 – 30 m. (b) 20 – 60 m. (c) 40 – 80 m. (d) 250 – 500 m. 3. Which of the following is the simplest method of making exploratory boreholes? (a) Auger boring (b) Wash boring (c) Percussion drilling (d) Rotary drilling 4. Disturbed soil samples cannot be used for (a) grain-size analysis. (b) specific gravity of soil solids. (c) classification. (d) hydraulic conductivity. 5. The soil sample collected by a sampler is generally considered to be undisturbed when the area ratio is (a) less than 10%. (b) equal to or less than 10%. (c) greater than 10%. (d) e9ual to or greater tham loo %.
3. A falling head permeability test is performed on a fine gravel soil. The soil sample has a length of 120mm and cross-sectional area of 600mm?.The water in the standpipe flowing into the soil is 0.60m above the top of the sample at the start of the test. It falls 50mm in 30 min. The standpipe has a cross- sectional area of 200mm?. a. Make a sketch of the described condition. b. What is the coefficient of permeability in millimeters per second? c. What is the coefficient of permeability in feet per minute? d. On the basis of the calculated value for k, what is the probable soil type?
Solve only if you are 100 % sure, else allow other experts to do , otherwise i will downvote The following series of standard penetration test (SPT) results was obtained in an 18-ft thick stratum of relatively uniform silty sand:
Which of the following approaches to field investigation provides rapid, cost-effective site characterization with continuous soil profiling? Select one: a. Drilling soil borings and sampling soils using thin-walled (Shelby) tubes and standard penetration tests (SPTS). O b. Performing electric cone penetrometer test (CPT) soundings.
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.
The blow counts for an SPT test at a depth of 6 m in a coarse-grained soil at every 0.152 m are 10, 10 and 10. A donut automatic trip hammer and a standard sampler were used in a borehole 152 mm in diameter. The SPT N value is: O 1.8 O 2.5 O 3.20 O 4. 10
A standard penetration test has been conduted at a depth of 15 ft in an 8-inch diameter exploratory boring using a USA-style safety hammer and a standard sampler. This test produced an uncorrected N-value of 12. The soil inside the sampler was a fine-to-medium sand with Dsq = 0.6 mm. The vertical effective stress at this depth is 1100 lb/ft². Adjust the N- value as described in Class handout, then compute the relative density and classify the soil using Table 3.3.
Please answer fast If the depth of penetration for a 2-x-2-x-2-cm cube is 0.5 cm, what is the percent penetration? (Report the percentage but don't include units, %).
Q2. (a) You are given the following results from Atterberg Limits testing on a soil sample (PL= 23%, LL = 55%) collected from a boring on a local project site. The soil sample had natural moisture content of 56.3% prior to Atterberg Limits testing. If the soil is fine grained, what is the USCS Group Symbol (refer to Figure 2a) on page 7 for this soil and what does the natural moisture content result tell you about the soil in-situ (i.e. “in place")?
A Cone Penetrometer Test (CPT) produces a continuous record of tip and sleeve resistance as well as pore pressure induced behind the cone tip. At a certain depth, the following are recorded: Cone Tip Resistance = 17 tsf; Friction Ration (Rf) = 2.6% The soil is most likely a O a Clayey Sit Ob Clay Sand Od Silt
Q3/ A standard penetration test was carried out at a site. The soil profile is given in Fig. 3 with the penetration values. The average soil data are given for each layer. Compute the corrected values of N60, (N1)60 and o average for sand layers only. Assume: standard 10 sampler, united state safety hammer and diameter of borehole 150mm. Depth (m) 0 12 14 Sand 7-18.5 kN/m 18.5 kN/m Sand 19.81 kN/m 2m +4+E Im N-value