Geo Tech

Soil is to be excavated from a borrow pit which has a density of 1.75 g/cc and water content of 12%. The specific gravity of soil particles is 2.7. The soil is compacted so that water content is 18% and dry density is 1.65 g/cc. For 1000 cu.m of soil in fill, estimate (i) the quantity of soil to be excavated from the pit in cu.m; and (ii) the amount of water to be added. Also determine the void ratios of the soil in borrow pit and fill.

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Soil is to be excavated from a borrow pit which has a density of 1.75 g/cc and water content of […]

Soil is to be excavated from a borrow pit which has a density of 1.75 g/cc and water content of 12%. The specific gravity of soil particles is 2.7. The soil is compacted so that water content is 18% and dry density is 1.65 g/cc. For 1000 cu.m of soil in fill, estimate (i) the quantity of soil to be excavated from the pit in cu.m; and (ii) the amount of water to be added. Also determine the void ratios of the soil in borrow pit and fill. Read More »

The unit weight of a sand backfill was determined by field measurements to be 1746 kg/m³. The water content at the time of the test was 8.6%, and the unit weight of the soil constituents was 2.6 g/cm³. In the laboratory, the void ratios in the loosest and densest states were found to be 0.642 and 0.462, respectively. What was the relative density of the fill? Also, explain the importance of this term.

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Relative Density of Sand Backfill (UPSC Engg. Services Exam 1994) Problem Statement (UPSC Engg. Services Exam 1994) The unit weight

The unit weight of a sand backfill was determined by field measurements to be 1746 kg/m³. The water content at the time of the test was 8.6%, and the unit weight of the soil constituents was 2.6 g/cm³. In the laboratory, the void ratios in the loosest and densest states were found to be 0.642 and 0.462, respectively. What was the relative density of the fill? Also, explain the importance of this term. Read More »

A highly sensitive volcanic clay was investigated in the laboratory and found to have the following properties: (i) gwet = 12.50 kN/m3 (ii) G = 2.75 (iii) e = 9.0 (iv) w = 311% In rechecking the above values, one was found to be inconsistent with the rest. Find the inconsistent value and report it correctly.

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A highly sensitive volcanic clay was investigated in the laboratory and found to have the following properties: (i) gwet =

A highly sensitive volcanic clay was investigated in the laboratory and found to have the following properties: (i) gwet = 12.50 kN/m3 (ii) G = 2.75 (iii) e = 9.0 (iv) w = 311% In rechecking the above values, one was found to be inconsistent with the rest. Find the inconsistent value and report it correctly. Read More »

A core cutter 12.6 cm in height and 10.2 cm in diameter weighs 1071 g when empty. It is used to determine the in-situ unit weight of an embankment. The weight of core cutter full of soil of2970 g. If the water content is 6%, what are in situ-dry weight and porosity? (ii) if the embankment gets fully saturated due to heavy rains what will be the increase in water content and bulk unit weight, if nonvolume change occurs? The specific gravity of soil solids is 2.69.

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A core cutter 12.6 cm in height and 10.2 cm in diameter weighs 1071 g when empty. It is used

A core cutter 12.6 cm in height and 10.2 cm in diameter weighs 1071 g when empty. It is used to determine the in-situ unit weight of an embankment. The weight of core cutter full of soil of2970 g. If the water content is 6%, what are in situ-dry weight and porosity? (ii) if the embankment gets fully saturated due to heavy rains what will be the increase in water content and bulk unit weight, if nonvolume change occurs? The specific gravity of soil solids is 2.69. Read More »

A clayey soil has saturated moisture content of 15.8%. The specific gravity is 2.72.Its saturation percentage is 70.8%. The soil is allowed to absorb water. After sometime, the saturation increased to 90.8%. Find the water content of the soil in the latter case.

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Soil Water Content Calculation (Civil Services Exam 1992) Problem Statement (Civil Services Exam 1992) A clayey soil has: Saturated moisture

A clayey soil has saturated moisture content of 15.8%. The specific gravity is 2.72.Its saturation percentage is 70.8%. The soil is allowed to absorb water. After sometime, the saturation increased to 90.8%. Find the water content of the soil in the latter case. Read More »

A compacted cylindrical specimen 50 mm diameter and 100 mm long is to be preparedfrom dry soil. If the specimen is required to have a water content of 15% and the percentage of air voids is 20,calculate the weight of soil and water required in the preparation of the soil whose specific gravity is 2.69.

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Compacted Soil Specimen (Civil Services Exam 1991) Problem Statement (Civil Services Exam 1991) A compacted cylindrical soil specimen has: Dimensions:

A compacted cylindrical specimen 50 mm diameter and 100 mm long is to be preparedfrom dry soil. If the specimen is required to have a water content of 15% and the percentage of air voids is 20,calculate the weight of soil and water required in the preparation of the soil whose specific gravity is 2.69. Read More »

A mass of soil coated with thin layer of paraffin wax weighs 690.6 g and the soil alone weighs 683 g. When the sample is immersed in water, it displaces 350 ml of water. The specific gravity of the soil is 2.73 and that of wax is 0.89. Find out void ratio and degree of saturation if it has got water content of 17%.

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Soil Properties with Paraffin Coating (Civil Services Exam 1990) Problem Statement (Civil Services Exam 1990) A soil sample coated with

A mass of soil coated with thin layer of paraffin wax weighs 690.6 g and the soil alone weighs 683 g. When the sample is immersed in water, it displaces 350 ml of water. The specific gravity of the soil is 2.73 and that of wax is 0.89. Find out void ratio and degree of saturation if it has got water content of 17%. Read More »

A natural soil sample has a bulk density of 2 g/cm3 with 6% water content. Calculate the amount of water required to be added to one cubic meter of soil to raise the water content to 15%while the voids ratio remains constant. What is then the degree of saturation? G = 2.67.

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Soil Water Content Adjustment (Civil Services Exam 1986) Problem Statement (Civil Services Exam 1986) A natural soil sample has: Bulk

A natural soil sample has a bulk density of 2 g/cm3 with 6% water content. Calculate the amount of water required to be added to one cubic meter of soil to raise the water content to 15%while the voids ratio remains constant. What is then the degree of saturation? G = 2.67. Read More »

A soil sample is partially saturated. Its natural moisture content was found to be 22%and bulk density 2 g/cm3. If the specific gravity of solid particles is 2.65 and the density of water be taken as 1 g/cm3, find out the degree of saturation and the void ratio.

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A soil sample is partially saturated. Its natural moisture content was found to be 22%and bulk density 2 g/cm3. If

A soil sample is partially saturated. Its natural moisture content was found to be 22%and bulk density 2 g/cm3. If the specific gravity of solid particles is 2.65 and the density of water be taken as 1 g/cm3, find out the degree of saturation and the void ratio. Read More »

Test on a fill reveal that one cubic meter of soil in the fill weighs 1624 kg and after being dried, 1.40 tones. If the specific gravity of solids is 2.65, determine the water content, void ratio, porosity and degree of saturation of the soil mass in moist state.

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Soil Properties Calculation (Civil Services Exam 1983) Problem Statement (Civil Services Exam 1983) A soil sample in its moist state

Test on a fill reveal that one cubic meter of soil in the fill weighs 1624 kg and after being dried, 1.40 tones. If the specific gravity of solids is 2.65, determine the water content, void ratio, porosity and degree of saturation of the soil mass in moist state. Read More »

The soil fill for a road embankment is to be compacted in place to a void ratio of 0.7. Ifthe void ratio of the borrow pit soil is 1.2, how many cubic metres of compacted fill can be placed in theembankment per 1000 cubic metres of borrow materials? If no water is either added or lost during theplacement of the fill, what would be the percentage change in the degree of saturation of the soil? Thecompacted fill is not fully saturated.

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Embankment Fill Calculation (Civil Services Exam 1982) Problem Statement (Civil Services Exam 1982) The void ratio of borrow pit soil

The soil fill for a road embankment is to be compacted in place to a void ratio of 0.7. Ifthe void ratio of the borrow pit soil is 1.2, how many cubic metres of compacted fill can be placed in theembankment per 1000 cubic metres of borrow materials? If no water is either added or lost during theplacement of the fill, what would be the percentage change in the degree of saturation of the soil? Thecompacted fill is not fully saturated. Read More »

Determine the voids ratio and porosity of a uniformly graded sand of perfectly spherical grains arranged in a rhombohedral array with an orientation angle α=75∘.

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Voids Ratio for Rhombohedral Packing (α = 75°) Problem Statement Determine the voids ratio and porosity of a uniformly graded

Determine the voids ratio and porosity of a uniformly graded sand of perfectly spherical grains arranged in a rhombohedral array with an orientation angle α=75∘. Read More »

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