A bed consists of compressible clay of 4 m thickness with pervious sand on top and impervious rock at the bottom. In a consolidation test on an undisturbed specimen of clay from this deposit 90% settlement was reached in 4 hours. The specimen was 20 mm thick. The time for the

A bed consists of compressible clay of 4 m thickness with pervious sand on top and impervious rock at the bottom. In a consolidation test on an undisturbed specimen of clay from this deposit 90% settlement was reached in 4 hours. The specimen was 20 mm thick. The time for the

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 11.12P

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Concept explainers

Calculation of Settlement

The vertical displacement of the structural foundation due to the loading from the superstructure is known as settlement. It is due to the reduction of air voids present in the soil. The amount of vertical displacement depends on the bearing capacity of the soil on which the foundation is laid. The effect of the settlement depends on the magnitude of settlement, uniformity, and the structural design of the structure. The maximum allowable settlement for residential and office buildings should be less than 18 mm, for industrial buildings, it is 38 mm and for commercial buildings, it is 25 mm.

Question

A bed consists
of compressible clay of 4 m
thickness with pervious sand on top and
impervious rock at the bottom. In a consolidation
test on an undisturbed specimen of clay from this
deposit 90% settlement was reached in 4 hours.
The specimen was 20 mm thick. The time for the
building founded over this deposit to reach 90%
of its final settlement will be?

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q21 A bed consists of compressible clay of 4 m thickness with pervious sand on top and impervious rock at the bottom. In a consolidation test on an undisturbed specimen of clay from this deposit 90% settlement was reached in 4 hours. The specimen was 20 mm thick. The time for the building founded over this deposit to reach 90% of its final settlement will be (a) 91 years (с) 73 years (b) 82 years (d) 64 years
During the shearing phase of a CU test, the void ratio of a NC consolidated clay specimen will: 1decrease. 2could increase or decrease. 3remain a constant. 4increase.
In an Oedometer test, a clay specimen with initial thickness 25 mm attained 90% consolidationin 12 minutes. The clay stratum in the field from which the specimen was obtained has athickness of 6m and is sandwiched between two sand layers. A structure constructed on this claywill experience an ultimate settlement of 200 mm. Estimate the settlement at the end of 100 daysafter construction.
A CU triaxial test was carried out on a silty clay that was isotopically consolidated using a cell pressure of 125 kPa. The following data were obtained: Axial load (kPa) 0 5.5 11.0 24.5 28.5 35.0 50.5 85.0 105.0 120.8 Axial strain, &₁ (%) 0 0.05 0.12 0.29 0.38 0.56 1.08 2.43 4.02 9.15 Au (kPa) 0 4.0 8.6 19.1 29.3 34.8 41.0 49.7 55.8 59.0 (a) Plot the deviatoric stress vs. axial strain and excess porewater pressure vs. axial strain, respectively. (b) Determine the undrained shear strength (sµ). (Note: we assume that the sample reaches failure). (c) Determine the total principal stresses (0₁,03) and the effective principal stresses (0₁, 03') at the failure, respectively.
What is the overconsolidation rate? Explain the difference between normal consolidated clay and overly consolidated clay?
Prob- The various approximations approaches described in this section can be used to compare K_a for both a normally consolidated (nc) clay and a clay with a known value of OCR = 5.0.
3. A stratum of normally consolidated clay is 25 feet thick and the water content is measured as 50% (Gs=2.7). Consolidation tests on undisturbed samples of the clay indicate Ce = 0.68. On top of the clay is 5 feet of sand with a total unit weight of 120 pcf. To build a parking lot, 8 feet of fill is now placed on top of the sand. Tests on the fill indicate that the average water content is 10% and the average dry unit weight is 115 pef. The water table is located 2 ft below the ground surface. Calculate the settlement of the clay due to the added weight of the fill. Treat the clay as one layer and compute the stresses and change in void ratio at mid-depth in the clay.
2. A normally consolidated clay layer, 3 m thick, has the following properties: Initial void ratio, e 0.8 Compression index, Cc = 0.25 Average effective pressure, o'o= 125 Kpa Expected pre ssure increase, Aơ = 45 Kpa Secondary compre ssion index, Ca= 0.02 Time of completion of primary settlement = 1.5years What is the total settlement of the clay layer five ye ars afterthe completion of the primary se ttle ment?
‘mormally consolidated clay given: 1S kKN/m® ateo=122 = 430 KN/m? ate=098 * 10° m/sec, Find: long in days will it take for a 3 m thick lsyer of the same drained both sides in the field to reach 50% consolidation? is settlement at 50% consolidation?
‹ample 9.1: Following results were recorded from a consolidation test on a specime turated clay, each load being maintained constant for 24 hours before the addition o ext increment.
What do you mean by clay sensitivity and what are the different range of claysensitivity?
A normally consolidated clay stratum 5m deep underlain by hard rock. The average effective overburden pressure before and after construction was 25 KPa and 250 KPa. The laboratory tests on this strata indicated natural moisture content of 50%, specific gravity of '3' and liquid limit of 54%. What will be the consolidation settlement of this layer?