Problem 4: After the construction of a concrete retaining wall, backfill material from a nearby borrow pit was brought into the excavation behind the wall and compacted to a final void ratio of 0.8. Given that the soil in the borrow pit has void ratio of 1.1, determine the volume of borrow material needed to fully compact backfill, knowing that the total volume of the backfill is 30 m³. Excavation Ground level Compacted backfill Soils from borrow pit (e = 0.8) Concrete (e = 1.1) retaining wall

Problem 4: After the construction of a concrete retaining wall, backfill material from a nearby borrow pit was brought into the excavation behind the wall and compacted to a final void ratio of 0.8. Given that the soil in the borrow pit has void ratio of 1.1, determine the volume of borrow material needed to fully compact backfill, knowing that the total volume of the backfill is 30 m³. Excavation Ground level Compacted backfill Soils from borrow pit (e = 0.8) Concrete (e = 1.1) retaining wall

Principles of Geotechnical Engineering (MindTap Course List)

9th Edition

ISBN:9781305970939

Author:Braja M. Das, Khaled Sobhan

Publisher:Braja M. Das, Khaled Sobhan

Chapter11: Compressibility Of Soil

Section: Chapter Questions

Problem 11.1CTP

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A contractor excavates 10,000 m3 soil at moist unitweight of 17.5 kN/m3 and moisture content of 10%from a borrow pit and transports it to a project site.The project has an area of 20,000 m2 to be filled withthis compacted soil. If the required dry unit weightand moisture content of the compacted soil are 18.3kN/m3 and 12.5% (assume there is no soil loss duringtransportation and compaction), what is the thicknessof the compacted soil and how much water needs to beadded? If there are 2% dry soil loss and 3% moisture loss, what is the thickness of the compacted soil and how much water neeeds to be added to maintain the compaction at the required moisture content?
It is desired to calculate the consolidation settlement of the 6m thick layer shownin the below figure that will result from the load caried by the footing measuring 3mx3m inplan (bottom of footing is 2m below the surface). Assume the clay to be normallyconsolidated. Compute the following:a. Immediate Settlement, ??b. Primary Consolidation Settlemen, ??c. Secondary Consolidation Settlement, ??d. Total Consolidation Settlement, ?? of the clay 5 years after the completion of the primarysettlement. The time for the completion of the primary settlement is 3 years.?? = ?? ??????????′? ????? = ?. ???? = ?. ???????????? ?????, ?? = ?. ???(?? − ??)????????? ??????????? ?????, ?? = ?. ??�
What is Dynamic Deep Compaction/Consolidation?
Determine the consolidation settlement ofthe 4-m thick clay layer shown in the figurethat will result from the load carried by thefooting measuring 3 m x 1.5 m in the figure.Assume the clay to be normally consolidatedand the load of footing results to an increasein pressure of 23.2 kPa, 12.22 kPa, and 6.1kPa at the top, mid-height, and bottomportion, respectively of the clay layer.a) Calculate the overburden pressure at thebase of the footing in kPab) Calculate the initial effective stress at themid-height of the clay layerc) Calculate the consolidation settlement ofthe clay layer
Specifications require that a fill using borrow soil to be compacted at 95% of its standard proctor maximum dry density. Tests indicate that this maxi-mum is 19.5 kilo Newtons per cubic meter with 12 % moisture. The borrow material has a void ratio of 0.60. Compute the minimum dry and wet unit weight of the compacted soil, compute also the minimum volume of borrow material required to fill 1 cubic meter when compacted. Assume a logical value of Gs with at least 4 significant figures.
Refer to Figure 2. Embankments are generally constructed in several layers that are compacted according to geotechnical specifications.layers that are compacted according to geotechnical specifications. The thickness of eachof each layer is 3ft and should have a dry unit weight of 118 lb/ft3 .. It is known that theThe soil used in the embankment has a wet unit weight of 111 lb/ft3, moisture contentmoisture content of 23%, and Gs = 2.67. Complete the following tasks:(a) Determine the wet weight of the soil required to construct the first layer.(closest to the foundation soil) per foot (ft) of the embankment.b) On the day of construction there was a heavy rain that caused the soil used to reach a nearly saturated condition.used to reach a near saturated condition. Recalculate the wet weightwet weight of soil required to construct the first layer.
A new construction site requires 1500 m3 of moist compacted soils. The design specification of the fill material specifies the following: Water Content 15% Unit weight of the compacted soil to be 18.5 kN/m3 Soil from borrow site has the following specification: Water Content 12% Unit weight of the borrow material: 17.5 kN/m3 Soil Specific Gravity: 2.6 How much (in cubic meters) of the borrow material is required to fill the construction fill section?
4. Specifications require that a fill using borrow soil to be compacted at 95% of its standard proctor maximum dry density. Tests indicate that this maxi- mum is 19.5 kilo Newtons per cubic meter with 12 % moisture. The borrow material has a void ratio of 0.60. Compute the minimum dry and wet unit weight of the compacted soil, compute also the minimum volume of borrow material required to fill 1 cubic meter when compacted. Note: Assume a logical value of Gs with at least 4 significant figures.
A five-story office building is to be built on a site underlain by moderately uniform soils.Bedrock is at a depth of over 200 m. This building will be 50 m wide and 85 m long, and thefoundations will be founded at a depth of 1 m below the ground surface. Determine the requirednumber and depth of the exploratory borings.
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A proposed embankment fill requires 7500 m3 of compacted soil. The void ratio of thecompacted fill is specified as 0.7. Soil can be transported from one of the four borrowpits, as described in the following table. The void ratio, specific gravity of soil solids,and the cost per cubic meter for moving the soil to the proposed construction site areprovided in the table.a. Determine the volume of each borrow pit soil required to meet the specification ofthe embankment site.b. Make the necessary calculations to select the borrow pit which would be most costeffective.
The Undisturbed soil at a given borrow pit is found to have the following parameters. The water content is 15%, the void ratio is 0.60 and the specific gravity of the solids is 2.70.The soil from this borrow pit is to be used to construct a rolled fill having a finished volume of 50,000 yd3. The soil is excavated by means of a shovel and dumped on trucks. When loaded to capacity these trucks are found to contain, on average, a net weight of wet soil equal to 13,000 lbs.In the construction process, the trucks dump their load on the fill, the material is spread and broken up, after which a sprinkler adds water until the water content is equal to 18%. The soil and water are thoroughly mixed by means of dicers (or other similar equipment) and then compacted until the dry unit weight γd=110 lbs/ft3 Helpful Conversions (3ft=1yd), (γw=62.4 lbs/ft3), (7.48gal/1ft3) a) Assuming that each load is a capacity load, how many truck loads are required to construct the fill?b) What is the volume in…