Resuits of a lavoratory consolidation test on a 5 meter thick clay (at a site) indicates t 50 = 12.2 minutes for the load increment of 8 tons/ sq ft. The lab sample had drainage on top and on the bottom. The lab sample height is 1.582 cm. a. Determine the coefficient of consolidation for the load range in cm squared/min. b. Based on the laboratory results above (a), compute the time it will take for 100 % consolidation of the 5 meter thick clay layer in the field. A sand layer overlies the clay layer and impervious rock underlies the clay layer. Answer the time in years.

Resuits of a lavoratory consolidation test on a 5 meter thick clay (at a site) indicates t 50 = 12.2 minutes for the load increment of 8 tons/ sq ft. The lab sample had drainage on top and on the bottom. The lab sample height is 1.582 cm. a. Determine the coefficient of consolidation for the load range in cm squared/min. b. Based on the laboratory results above (a), compute the time it will take for 100 % consolidation of the 5 meter thick clay layer in the field. A sand layer overlies the clay layer and impervious rock underlies the clay layer. Answer the time in years.

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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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

Results of a lavoratory consolidation test on a 5 meter thick clay
(at a site) indicates t 50 = 12.2 minutes for the load increment of 8
tons/ sq ft. The lab sample had drainage on top and on the bottom.
The lab sample height is 1.582 cm.
a. Determine the coefficient of consolidation for the load range
in cm squared/min.
b. Based on the laboratory results above (a), compute the time
it will take for 100 % consolidation of the 5 meter thick clay
layer in the field. A sand layer overlies the clay layer and
impervious rock underlies the clay layer. Answer the time in
years.

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Please solve with all work shown. Thank you
The following figure show the relationship between the voids ratio and effective stress for a soil sample collected from the mid depth of a 6 m thick clay layer. The Cc and Cr values have been determined to be 0.3 and 0.04 respectively. For the given information: If the current effective stress at the mid depth is 70 kPa, calculate the ultimate consolidation settlement when the effective stress at mid depth increases by 10 kPa due to an applied load. If the coefficient of consolidation is 0.555 m2/s and the clay layer is single drained, calculate the time taken to reach 45% consolidation.
Please solve fully and please make sure the answer to the second part is in time units of years. Thank you
4) In a oedometer test a specimen of a saturated clay 21 mm thíck reaches 50% consolidation in 10 minutes. How long would it take a layer of this clay 6 m thíck under the same drainage conditions to reach 90% f consolidation under the same stress and drainage conditions? Use the following relationships between the average degree of consolidation, U and time factor, T,: U =T, for Us 50% U =1-- for U>50% No need for calculation, please write only the results.