Question No.1 a) Explain with the use of graphs, the 3 major parameters and their importance that are obtained from a laboratory consolidation test. b) Use sketches to show how to determine the pre- consolidation pressure for an over consolidated soil from its e vs log P curve. c) How do you find the field consolidation curve (line) for an over consolidated clay? Illustrate with diagrams. What important soil parameter is obtained from the curve (line) and how.

Question No.1 a) Explain with the use of graphs, the 3 major parameters and their importance that are obtained from a laboratory consolidation test. b) Use sketches to show how to determine the pre- consolidation pressure for an over consolidated soil from its e vs log P curve. c) How do you find the field consolidation curve (line) for an over consolidated clay? Illustrate with diagrams. What important soil parameter is obtained from the curve (line) and how.

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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Question No.1 a) Explain with the use of graphs, the 3 major parameters and their importance that are obtained from a laboratory consolidation test. b) Use sketches to show how to determine the pre- consolidation pressure for an over consolidated soil from its e vs log P curve. c) How do you find the field consolidation curve (line) for an over consolidated clay? Illustrate with diagrams. What important soil parameter is obtained from the curve (line) and how.
1.In an oedometer test a specimen of saturated clay 19 mm thick reaches 50%consolidation in 20 min. How long would it take a layer of this clay 5 m thick toreach the same degree of consolidation under the same stress and drainageconditions? How long would it take the layer to reach 30% consolidation?
Kindly answe the question in the image given below (Q3)
Two identically clay samples of the same size designated as A and B are subjected to consolidation under identical conditions. Drainage takes place through one face in sample A and through both the faces in sample B. 50% consolidation of sample A occurs in 10 minutes. The time required for 50 % consolidation to occur in sample B in minutes will be. (a) 40 (c) 5 (b) 10 (d) 2.5
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
2 A soil profile is shown in Figure 11.19a. Laboratory consolidation tests were conducted on a specimen collected from the middle of the clay layer. The field consolidation curve interpolated from the laboratory test results is shown in Figure 11.19b. Calculate the settlement in the field caused by primary consolidation for a surcharge of 48 kN/m? applied at the ground surface. 1.12 48 KN/m L.10 Groundwater table 1.08 L06 o- 1.1 10m Y- 18 KN/m 104 102 1.00 40.95 70 100 Pressure a (log scale) (kN/m) E Clay Rock Void ratio, e