Principles of Foundation Engineering (MindTap Course List)
9th Edition
ISBN: 9781337705028
Author: Braja M. Das, Nagaratnam Sivakugan
Publisher: Cengage Learning
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Chapter 5, Problem 5.4P
To determine
Find the difference in the values of
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The following are results of a field unit weight determination test using sand cone method:
Volume of hole = 0.0019 m3
Mass of moist soil from hole = 3.48 kg
Water content = 12.43%
Max. dry unit weight from a laboratory compaction test = 19.56 kN/m3
Determine the relative compaction, in percent.
Hint: Relative compaction = Field dry unit weight / Max dry unit weight (lab)
2- The following are the results of four drained direct shear tests on undisturbed normally consolidated clay samples
having a diameter of 2.0 inches and height of 1.0 inch.
a) Draw a graph on excel for shear stress at failure against the normal stress and determine the drained angle of
friction from the graph.
b) If a drained triaxial test is conducted on the same soil with a chamber confining pressure of 4,344 lb/ft², what
would be the deviator stress at failure?
c) For part b, what is the inclination of the failure plane with the major principal plane?
Shear Force at
Test No.
Normal Force
(lbf)
Failure (lbf)
1
56.2
31.2
84.3
47.0
101.1
56.2
121.4
67.4
23+
2
4
A sand cone test has been performed in a recent compacted fill. The test results were as follows: Initial weight of sand cone + sand= 6.14 kg; Final weight of sand cone + sand = 1.94 kg; Weight of sand to fill cone = 0.96 kg; Weight of soil from hole + bucket = 5.65 kg; Weight of bucket = o.55 kg. For Moisture content test the result were as follows: Mass of empty moisture can= 23.11 g; Mass of moist soil + moisture can = 273.93 g; Mass of oven-dried soil + moisture can = 250.10 g. The sand used on the sand cone had a unit weight of 12.75 kN/m3 and the fill had a maximum dry unit weight of 19.04 kN/m3 and an optimum moisture content of 11.7%. Compute the volume of the hole in m3.
a.0.00249
b.0.0145
c.0.00389
d.0.00781
Chapter 5 Solutions
Principles of Foundation Engineering (MindTap Course List)
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- Sand cone equipment is used to perform a field density test on a compacted earth fill. • Soil sample dug from the test hole = 20.60 N • Dry weight of soil sample = 17.92 N Ottawa sand used to fill the hole weighs 16.05 N and is known to have a density of 15.74 kN/m3. Determine the in-place dry density of the tested soil. Answer:arrow_forwardA sand cone test has been performed in a recent compacted fill. The test results were as follows: Initial weight of sand cone + sand= 6.14 kg; Final weight of sand cone + sand = 1.94 kg; Weight of sand to fill cone = 0.96 kg; Weight of soil from hole + bucket = 5.65 kg; Weight of bucket = o.55 kg. For Moisture content test the result were as follows: Mass of empty moisture can= 23.11 g; Mass of moist soil + moisture can = 273.93 g; Mass of oven-dried soil + moisture can = 250.10 g. The sand used on the sand cone had a unit weight of 12.75 kN/m3 and the fill had a maximum dry unit weight of 19.04 kN/m3 and an optimum moisture content of 11.7%. Compute the relative compaction. a. 96.93 b. 90.21 c. 97.21 d. 95.43arrow_forwardA sand cone test has been performed in a recent compacted fill. The test results were as follows: Initial weight of sand cone + sand= 6.14 kg; Final weight of sand cone + sand = 1.94 kg; Weight of sand to fill cone = 0.96 kg; Weight of soil from hole + bucket = 5.65 kg; Weight of bucket = o.55 kg. For Moisture content test the result were as follows: Mass of empty moisture can= 23.11 g; Mass of moist soil + moisture can = 273.93 g; Mass of oven-dried soil + moisture can = 250.10 g. The sand used on the sand cone had a unit weight of 12.75 kN/m3 and the fill had a maximum dry unit weight of 19.04 kN/m3 and an optimum moisture content of 11.7%. Compute the dry unit weight of soil in kN/m3. a. 15.7 b. 19.8 c. 18.7 d. 16.8arrow_forward
- 2. A sensitive volcanic clay soil was tested in the laboratory and found to have the following properties: . p=1.28 Mg/m³ e = 9.0 S = 95% Ps= 2.75 Mg/m³ W = 311% In rechecking the above values, one was found to be inconsistent with the rest. Find the inconsistent value and report it correctly. Show all your computations and phase diagrams.arrow_forwardA compacted fill of 3.0 m height is to be placed over a large area. The soil profile under the area is shown in the scheme below. An oedometer test on a sample from point A produced the following results: Ce C, eo o(kPa) Sample A: 0.40 0.08 1.10 70.0 These results can be used in settlement calculations for the soft clay stratum as a whole. Compute the total settlement below centre of the area due to the weight of the fill.arrow_forwardA constant-head permeability test is performed, and the information below indicates the test conditions and results. From the given data, provide a sketch representing the test arrangement, and calculate the value for the coefficient of permeability. On the basis of the computed value for khyd, indicate the probable soil type. Water flows horizontally through the soil sample. The height of the reservoir supply source is 2 m above the elevation of the outlet reservoir. The soil sample length in the direction of water flow is 200 mm. . The cross-sectional area of the soil sample is 1,950 mm2. The measured volume of flow for the steadystate condition is 500 ml in a 10-minute time period (note 1 ml = 1,000 mm3).arrow_forward
- 15. The following are results of a field unit weight determination test using sand cone method: Volume of hole = 0.0018 m3 Mass of moist soil from hole = 3.44 kg Water content = 12.30% Max. dry unit weight from a laboratory compaction test = 19.94 kN/m3 Determine the relative compaction, in percent. Round off to two decimal places. Hint: Relative compaction = Field dry unit weight / Max dry unit weight (lab)arrow_forward9. A falling head permeability test was performed on a sand sample and the following data were recorded: = Cross-sectional area of permeameter = 100 cm2; length of the soil sample 15 cm; area of the stand pipe 8 min, = 1 cm2, time taken for the head to fall from 150 cm to 50 cm = temperature of water = 25°C; dry mass of the soil specimen 2.2 kg and its Gg = 2.68. Compute the coefficient of permeability of the soil for a void ratio of 0.70 and standard temperature of 20°C. (2 x 10 cm/s) =arrow_forwardThe following data has been obtained from a standard Proctor test conducted on a silty clay soil. The maximum dry unit weight = 17.5 kN/m³; Optimum water content = 12.5% The construction specifications require a relative compaction of 95% and field compaction water content to be within ±2% if the optimum. A sand cone test was performed to measure the dry unit weight and water content achieved during the field compaction operation. The volume of the test hole has been already been calculated from the sand cone data Volume of test hole = 1.5x10-3 m³. Total weight of moist soil removed from hole = 2.73 kg %3D Weight of soil removed from hole after drying = 2.46 kg Use conversion 1.0kg = 0.01 KN Determine the following: %3D a. Field water content (%) = Report to ONE decimal (Show work in hand-calc sheet) b. Has the compaction specifications met with respect to compaction water content? Say YES or NO c. Field dry unit weight (kN/m3) = Report to ONE decimal (Show work in hand-calc sheet) d.…arrow_forward
- Given in the following table is the result of the standard proctor test: Dry Unit Weight (KN/m³) 16.79 Test no. Water Content (%) 5.75 1 2 8.60 19.20 3 13.7 19.28 4 16.8 16.99 5 21.3 15.50 Then followed by a sand cone test has been performed in a compacted fill which has the following data: Initial mass of sand cone apparatus with sand = 5.915 kg Final mass of sand cone apparatus with sand = 2.380 kg Mass of soil removed from hole = 2.883 kg Moisture content of soil from hole = 7% Density of sand =1300 kg/m³ Volume of sand cone below valve = 0.001114 m³ a) Using compaction curve, plot the water content versus the dry unit weight to determine the maximum dry unit weight and the optimum moisture content b) Determine the field dry unit weight in KN/m³ c) Determine the relative compaction and rate its qualityarrow_forwardFigure Q1(b)(i) shows the result of a Shelby tube sample of field moist soilcontaining weight wet and dry soil as 7.951 kg and 6.795 kg, respectively.It is estimated that the Gs of soil is considered as 2.7. With the aid of a soildiagram, compute the values of W, γd, γm, n and S.arrow_forward(ex A subgrade soil sample was tested using standard CBR apparatus and the observations are given below. Load (kg) 60.5 Penetration (mm) 2.5 80.5 Assuming that the load-penetration curve is convex throughout, the CBR value (%) of the sample is 5.0arrow_forward
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