Two identical soil samples C and D were consolidated to effective confining pressures of 100 and 300 kPa, respectively before undrained triaxial shear tests with pore-water pressure measurement. The pre-consolidation pressure of this soil was equal to 200 kPa. Which one of these samples, C or D will have higher pore-water pressure at failure? i): Sample C (tested with a confining pressure 100 kPa) confining pressure 300 kPa) (ii) Sample D (tested with a

Two identical soil samples C and D were consolidated to effective confining pressures of 100 and 300 kPa, respectively before undrained triaxial shear tests with pore-water pressure measurement. The pre-consolidation pressure of this soil was equal to 200 kPa. Which one of these samples, C or D will have higher pore-water pressure at failure? i): Sample C (tested with a confining pressure 100 kPa) confining pressure 300 kPa) (ii) Sample D (tested with a

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

Consolidation parameters

Consolidation is the process of expulsion of pore water present in the voids of soil solids under the pressure of the applied load. This is a quick process in the case of coarse-grained soils since the permeability is high due to the presence of more voids, while it is a slow and gradual process in the case of clayey soil as the permeability of clay is less. An example of consolidation is the settlement of soil under a building due to the load coming from the building.

Question

Two identical soil samples C and D were consolidated to effective confining pressures
of 100 and 300 kPa, respectively before undrained triaxial shear tests with pore-water
pressure measurement. The pre-consolidation pressure of this soil was equal to 200 kPa.
Which one of these samples, C or D will have higher pore-water pressure at failure?
(i): Sample C (tested with a confining pressure 100 kPa)
confining pressure 300 kPa)
(ii) Sample D (tested with a

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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
2- The following are the results of four drained direct shear tests on undisturbed normally consolidated clay samples having a diameter of 2.0 inches and height of 1.0 inch. a) Draw a graph on excel for shear stress at failure against the normal stress and determine the drained angle of friction from the graph. b) If a drained triaxial test is conducted on the same soil with a chamber confining pressure of 4,344 lb/ft², what would be the deviator stress at failure? c) For part b, what is the inclination of the failure plane with the major principal plane? Shear Force at Test No. Normal Force (lbf) Failure (lbf) 1 56.2 31.2 84.3 47.0 101.1 56.2 121.4 67.4 23+ 2 4
Ex Two identical soil samples (A) and (B) of a fully saturated N.C.C. were tested. Sample (A) was subjected to an unconfined compression test and failed when the deviator stress (OT-13) was (200) kN /n². Sample (B) was tested under UU conditions with a cell pressure of (300) kN/m². The pore water pressure at failure. was (200) kN/m². a) What was the pore water pressure at failure in sample (A). b) If C=o, Find (2) for this clay. (Itint. Start with soil B, and that (OJ) un= (FJ) afined). unconfined
Note) For soil sample in Table 2, initial thickness of sample = 14.31 mm, sample area = 2827.433 mm^2, dry weight measured at the end of test = 52.53 g, specific gravity = 2.7 Also, Determine the compression index and expansion index Please show graph