The following readings were taken for an increment of vertical stress of 400 psf in a one-dimensional consolidation test on a saturated clay sample 3 in diameter and 0.75 in thick. Drainage was permitted from the top and bottom boundaries. Determine the .coefficient of consolidation using the root time method Tinmin) 0.25 AH (in) 1 2.25 16 25 36 64 144 24 hours 0.0047 0.009 0.0133 0.0169 0.023 0.0268 0.0291 0.03 0.032 0.033 0.035

The following readings were taken for an increment of vertical stress of 400 psf in a one-dimensional consolidation test on a saturated clay sample 3 in diameter and 0.75 in thick. Drainage was permitted from the top and bottom boundaries. Determine the .coefficient of consolidation using the root time method Tinmin) 0.25 AH (in) 1 2.25 16 25 36 64 144 24 hours 0.0047 0.009 0.0133 0.0169 0.023 0.0268 0.0291 0.03 0.032 0.033 0.035

Fundamentals of Geotechnical Engineering (MindTap Course List)

5th Edition

ISBN:9781305635180

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter11: Ground Improvement

Section: Chapter Questions

Problem 11.8P

See similar textbooks

Similar questions

A 3-m thick layer of saturated clay (two-way drainage) under a surcharge loadingunderwent 90% primary consolidation in 100 days. The laboratory test’s specimenwill have two-way drainage.a. Find the coefficient of consolidation of clay for the pressure range. b. For a 25 mm. thick undisturbed clay specimen, how long will it take to under-go 80% consolidation in the laboratory for a similar pressure range?
A deposit of cohesionless soil with a permeability of 0.3 mm/s has a depth of 12 m with impervious ledge below. A sheet pile wall is driven into this deposit to a depth of 8 m. The wall extendsabove the surface of the soil, and a 3 m depth of water acts on one side. Sketch the flow net and determine the seepage quantity. a. 600 ml/s/meter length b. 300 ml/s/meter length c. 1200 ml/s/meter length d. 900 ml/s/meter length
A deposit of cohesionless soil with a permeability of 0.3 mm/s has a depth of 12 m with impervious ledge below. A sheet pile wall is driven into this deposit to a depth of 8 m. The wall extendsabove the surface of the soil, and a 3 m depth of water acts on one side. Sketch the flow net and determine the seepage quantity. Provide a diagram a.600 ml/s/meter length b.300 ml/s/meter length c.900 ml/s/meter length d.1200 ml/s/meter length
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
Q#2: (a). What is consolidation? Explain the concept of NCR and OCR with examples in your own words. (b). The results of a consolidation test on an undisturbed soil sampled at a depth of 10m below the Ground level are as follows: ϒsat = 16KN/m3, Pre consolidation pressure =90 KPA, ϒw = 10KN/m3. Calculate the over consolidation of soil and Type of consolidation soil. Solve only part B
Subject: Soil Mechanics Please prove a solution and diagram A 2.5 cm thick sample of clay was taken from the field for predicting the time of settlement for a proposed building which exerts a uniform pressure of 100 kN/m2 over the clay stratum. The sample was loaded to 100 kN/m2 and proper drainage was allowed from top and bottom. It was seen that 50 percent of the total settlement occurred in 3 minutes. Find the time in days required for 50 percent of the total settlement of the building, if it is to be constructed on a 6 m thick layer of clay which extends from the ground surface and is underlain by sand a. 120 b. 140 c. 130 d. 110
A soil excavation was done until 4m below the surface of the soil. It was identified that the shallow ground water level is 2m below the ground level and the upper is dry. The properties of the soil are: Gs = 2.7, e = 0.50, and ϕ’ = 30degrees. Assuming no seepage. What is the value of the in-situ soil’s unit weight above G.W.T. in kN/m3? What is the maximum neutral stress at the deepest point of excavation in kPa? What is the value of the total stress of soil at the surface of the ground water table in kPa? What is the value of the effective stress at the deepest point of excavation in kPa?
Q#2: (a). What is consolidation? Explain the concept of NCR and OCR with examples in your own words. (b). The results of a consolidation test on an undisturbed soil sampled at a depth of 10m below the Ground level are as follows: ϒsat = 16KN/m3, Pre consolidation pressure =90 KPA, ϒw = 10KN/m3. Calculate the over consolidation of soil and Type of consolidation soil.
Q#4: Plate load test performed on a uniform deposit of sand and the following observations were recorded. The size of the plate was 45cm x 45cm. Plot the Pressure-Settlement Curve and determine the safe load on a footing 2m x 2m if the settlement is not to exceed 40mm. Pressure (kPa) 2 4 8 12 16 24 Settlement (mm) 3 6 20 40 60 100 Note: Write the proper answer in word format Subject: Geotechnical Design
The following data are given for overconsolidated clay: Gs=2.71 LL=45 Average Pressure=120 kPa e=0.8 thickness=4m Change in Pressure =40 kPa Cs=1/5 Cc Determine the following 1. Compression Index (Ans. 0.315) 2. Pre-consolidation Pressure (Ans. 92.9 kPa) 3. Primary Consolidation Settlement (Ans. 49 mm)
Figure Q1(c) shows the soil profile with groundwater table is 6 m from thesurface impermeable layer. Calculate the total stress, pore water pressureand effectives tress at points D.
A dilatometer test was conducted in a clay deposit. The groundwater table was locatedat a depth of 3 m below the surface. At a depth of 8 m below the surface, the contact pressure spod was 280 kN/m2 and the expansion stress sp1d was 350 kN/m2. Determinethe following:a. Coefficient of at-rest earth pressure, Kob. Overconsolidation ratio, OCRc. Modulus of elasticity, EsAssume s 9o at a depth of 8 m to be 95 kN/m2 and ms 5 0.35.