A field sand cone test is performed on a layer of compacted fill. determined that the fill soil has a maximum dry unit weight of approximately 120 pcf. Determine the relative compaction of the compacted fill. Unit weight of dry uniform of sand: 95 pcf Weight of sand to fill the cone: 1.10 lb weight of jar + cone + sand (before test): 16.5 lb Weight of jar + cone + sand (after test): 10.5 lb Weight of moist soil excavated from hole: 6.60 lb Moisture content of soil from hole: 10 %

A field sand cone test is performed on a layer of compacted fill. determined that the fill soil has a maximum dry unit weight of approximately 120 pcf. Determine the relative compaction of the compacted fill. Unit weight of dry uniform of sand: 95 pcf Weight of sand to fill the cone: 1.10 lb weight of jar + cone + sand (before test): 16.5 lb Weight of jar + cone + sand (after test): 10.5 lb Weight of moist soil excavated from hole: 6.60 lb Moisture content of soil from hole: 10 %

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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A sand cone test has been performed in a recently compacted fill. The test results were as follows: Initial weight of sand cone + sand = 6.14 kg Moisture Content Test: Final weight of sand cone + sand = 1.94 kg Mass of empty moisture can = 23.11 g Weight of sand to fill cone = 0.96 kg Mass of moist soil + can = 273.93 g Weight of soil from hole + bucket = 5.65 kg Mass of dry soil + can = 250.10 g Weight of bucket = 0.55 kg 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 % a. Compute the volume of hole b. Compute the dry unit weight of soil. c. Compute the relative compaction.
Please help answer problem 1,2 & 3 Thank you
(From Chapter 7) 6. A sample of normally consolidated clay was obtained by a Shelby tube sampler from the midheight of a normally consolidated clay layer (see Figure 7-34). A consolidation test was conducted on a portion of this sample, the results of which are given as follows: FIGURE 7-34 Water Table 9 ft. square Sand and Gravel Unit Weight = 120 lb/ft³ Normally Consolidated Clay Unit Weight = 103 lb/ft³ Gravel and Sand Unit Weight = 125 lb/ft³ p (tons/ft²) 0.250 0.500 1.00 2.00 4.00 8.00 16.00 e Elevation 100 ft 1.72 1.70 1.64 1.51 1.34 1.15 0.95 Elevation 94 ft 1. Natural (initial) void ratio of the clay existing in the field (eo) = 1.80. 2. Pressure-void ratio relationships are as follows: Elevation 85 ft Elevation 76 ft A footing is to be constructed 6 ft below ground surface, as shown in Figure 7-34. The base of the footing is 9 ft by 9 ft, and it carries a total load of 200 tons, which includes the column load, weight of footing, and weight of soil surcharge on the footing. a.…
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. The wet density of a sample of sand found at a site is 1.85 Mg/cubic meter with a water content of 12%. The specific gravity is 2.71 (Mg/cubic meter). The maximun and minimum void ratios are 0.65 and 0.38, respectivily. Calculate the relative density of the sand at the site.
A Standard Proctor compaction test performed on a sample of crushed limestone (G; = 9.70) obtained a maximum dry unit weight of 80 pef at OMC. A field compacted sample showed a moisture of 98% and a unit weight of 803.7 pef. Find the relative compaction (RC). Find the degree of saturation S of the field soil sample.
The results of a laboratory consolidation test on a clay specimen are the following. Pressure, ir (lb/ft²) 500 1.000 2.000 4.000 8,000 16.000 Total height of specimen at end of consolidation (in.) 0.6947 0.6850 0.6705 0.6520 0.6358 0.6252 Given the initial height of specimen = 0.748 in.. G specimen = 95.2 g. and area of specimen = 4.91 in.²: a. Plot the e-log or curve = 2.68. mass of dry b. Determine the preconsolidation pressure c. Calculate the compression index, C.
An in-place density determination (in-place unit weight) is made for the sand in a borrow pit using a balloon- type density apparatus. The damp sample dug from a test hole is found to weigh 8.5 lb. The volume of the test hole is 0.065 ft3. From these data, compute the wet unit weight of the soil.
A proposed fill is to be placed on the soil profile shown in Figure 3.9. A consolidation test has been performed on a sample obtained from Point A, and this test indicates the preconsoli- dation pressure at that point is 200 kPa. Determine whether the silty clay stratum is normally consolidated or overconsolidated, and compute the o solidation ratio. The proposed fill has not yet been placed. overcon- Hint: Determine EFFECTIE STRRESS ATA water > leval 1.2m Silty Y = 19.1 kN/m 1.0m. Sand (SM): Y = 20.2 kN/m? 20 M Silty Clay (CL) Y=17.8 kN/m Figure 3.9 Soil profile for Example 3.3.
A series of direct shear tests has been performed on a dense well-graded sand. All tests were performed on 3.00-in. diameter, 1.25 in. tall cylindrical samples, and were run slowly enough to produce drained conditions. The results of these tests are summarized in the following table: Test Number Normal Load (lb) Shear Load at Failure (lb) 1 100 84 2 200 159 3 400 319 Assuming the shear area remains constant during the test, determine the effective cohesion and effective friction angle from these test results. What values of these parameters would you expect? Are the test results consistent with your expectations? What values would you use for design?
Following are the results of a consolidation test on a sample of undisturbed clay obtained from the field. Pressure ơ' (kN/m²) Final Height of Specimen (mm) 24 10 23.78 20 23.30 50 22.22 100 20.58 200 19.04 400 17.52 800 16.31 17.75 The height of the specimen at the beginning of the test was 24 mm and the area of specimen was 50 cm? volume of specimen was 120 cm³. The mass of dry specimen was 180.4 g. Gs= 2.68. 1. Plot the e-log ơ' curve, 2. Using Casagrande's method, determine the preconsolidation pressure. 3. Calculate the compression index, Cc
A sample of saturated clay was placed in a container and weighed. The weight was 6N. The clay in its container was placed in an oven for 24 hours at 105˚C. The weight reduced to a constant value of 5N. The weight of the container is 1N. If Gs = 2.7, determine: a) Water Content b) Void Ratio c) Bulk Unit Weight d) Dry Unit Weight e) Effective Unit Weight