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 5.3P
To determine
Find the difference in the values of
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the modified compaction method for the same soil sample gives
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max. dry density value
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O 1(greater) 2(lower)
O 1(greater) 2(greater)
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)
A 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.
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Principles of Foundation Engineering (MindTap Course List)
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- (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_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_forwardSand 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_forward
- A 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_forward12.4 The following are the results of four drained direct shear tests on undisturbed nor- mally consolidated clay samples having a diameter of 50 mm. and height of 25 mm. Normal Shear force at Test no. force (N) fallure (N) 1 67 23.3 133 46.6 3 213 44.6 4 369 132.3 Draw a graph for shear stress at failure against the normal stress and determine the drained angle of friction from the graph. © Ceng age Leaming 2014arrow_forwardFollowing are the results of a field unit weight determination test on a soil using the Sand Cone Method. Determine the field unit weight of the soil. FEEDBACK GUARANTEEDarrow_forward
- Please solve A only. Subject: Geotechnical engi A sample coarse grained soil is 50mm. In diameter and 150mm long was tested in a constant-head apparatus. The soil sample was prepared at a void ratio of 1.5. The total head was kept constant at 300mm and the amount of water is collected in 4 sec. was 50cm^3. The test temperature was 22°Ca.) Compute the temperature correction factor.b.) Compute the corrected coefficient of permeability in cm/sec. c.) Compute the interstitial velocity.arrow_forward2. Sand cone equipment is used to perform a field density test on a compacted earth fill. Sand is used in the cone and is known to have a bulk density of 15.74 kN/m3 . Soil sample dug from test hole, (wet weight) = 20.601 N Dry weight of soil sample = 17.926 N Weight of sand (sand cone) to fill test hole = 16.503 N Determine the in-place dry density of the tested soil (Ans: 17.57 kN/m3) Determine the water content (Ans: 15%) Compute the percentage of compaction of the tested soil if the laboratory moisture-density curve indicates a dry density of 18.10 kN/m3 and an optimum moisture content of 13%. (Ans: 97.07%)arrow_forwardRefer to Problem 3.5. Using Eq. (3.28), determine the averagerelative density of the sand. Assume it is a fine sand.Use Eq. (3.13) to obtain (N1)60.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_forward2- 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 4arrow_forward2. 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_forward
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