Primary consolidation settlement is given by
where,
Sc is settlement
Cc is compression index
H is the thickness of clay layer
is initial void ratio
is initial effective stress
is increase in overburden pressure
Compression index is given by
where,
is change in void ratio
is final effective stress
is initial effective stress
The sample values are calculated as
Initial void ratio is given as 1.
Initial effective stress is given as 400 kN/m2
Increase in overburden pressure is given as 400 kPa
So, change in void ratio will be
The thickness of clay layer is given as 5 m.
Similarly all the values are calculated as
The following are the results (in kPa) of a consolidation test for a clay with a...
I want solution! 3. A laboratory consolidation test was conducted on a specimen collected form the middle of the overconsolidated clay layer and the field consolidation curve is given below. The effective overburden pressure was 40.95 kN/m²at the middle of the clay layer. Calculate a) the recompression index, b) the compression index, and c) the consolidation settlement when the average vertical stress increment at the middle of the clay layer is 50kN/m² due to a foundation load. The thickness of...
TOTAL CONSOLIDATION SETLEMENT Example 1: if the initial void ratio of a clay is e. = 0.9 at initial pressure o =95.8 kN/m, and the compression index of that soil is equal (Cc)=0.052, H=4 m thick, L.L.=42 %. If the clay layer is loaded with infinite load of Ao=287.5 kN/m?, calculate the amount of total settlement of the clay. Сс Se = H .log 1+e, 0 0
2. A future development site is to be preloaded with a 310 kPa surface surcharge to reduce potential settlements in a 12.5-m thick soft clay layer. The soft clay is overlain by a 3-m thick sand layer and underlain by permeable bedrock. The groundwater table is at the sand-clay interface. A sample of the soft clay was extracted from a depth of 9 m and a 1D consolidation and compression test was conducted. Compression data obtained from the test are...
The time for 50% consolidation of a 25 mm thick clay specimen (drained at top and bottom) in the laboratory is 150 sec. How long (in days) will it take for a 3 m thick layer of the same clay in the field under the same pressure increment to reach 75% consolidation? There is an impermeable shale layer at the bottom of the clay layer in the field I. 2. Use Figure 1 for the following Compute the vertical effective...
For the soil profile shown below, calculate the final settlement due to the placement of the sand fill. Estimate the excess pore pressure at a depth of 1.5 m into the third clay layer 1.5 years after the fill is placed. Assume the coefficient of consolidation is Cv = 1.8 m2/yr. Fill y = 16.0 kN/m² (3m thick) Clay 1 (3m thick) Sand (0.5m thick) Clay 2 (2m thick) Sand (0.5m thick) Clay 3 (4m thick) Sand (0.5m thick) eo...
The results of a laboratory consolidation test on a clay specimen are given in the table The initial height of the specimen is H=19 mm, specific gravity is ?? = 2.68, moisture content is ? = 26%. a. Draw the ? − log ?? ′ (?? ? − log ? ) curve (the student is allowed to plot using spreadsheet) b. Determine the preconsolidation stress Question 1 (40 points): The results of a laboratory consolidation test on a clay specimen...
Please, show step by step and clearly. problem 9.17, (Use 3 equally divided sub-layers for the 15 m clay layer). thanks please, resolve question 9.17 (Use 3 equally divided sub-layers for the 15 m clay layer) 9.16 The soil profile and the loading condition are given in the followin n) figure. Total new footing stress including the foundation at z 2 is 400 kN/m2. The soil profile has a rather thick clay layer (15 so that the layer should be...
1. An 8-m thick normally consolidated clay layer is doubly drained as shown below. (This means that a very pervious layer compared to the clay exists on top of and under the clay layer) The embankment applied an average vertical stress increase of 100 kPa to the clay layer. The water table is located at the mid depth of the sand layer. Assume the sand above the water table is dry 0 Pore water pressure, u (kPa) 20 40 60...
Q1) An oedometer test was performed on a 2 cm thick clay sample drained on both sides taken from the mid clay layer shown below , after 10 minutes 50% consolidation is reached. a) How long time in days would the same degree of consolidation(50%) be reached in the field ?. b) How much the Final settlement would be reached in the clay layer.? c) How much the preconsolidation pressure of a specimen. ? 3m 2m Sand surcharge Y= 17...
soil Q1) An oedometer test was performed on a 2 cm thick clay sample drained on both sides taken from the mid clay layer shown below, after 10 minutes 50% consolidation is reached . a) How long time in days would the same degree of consolidation(50%) be reached in the field ?. b) How much the Final settlement would be reached in the clay layer.? c) How much the preconsolidation pressure of a specimen. ? 3m 2m Sand surcharge Y...