The coordinates of two points on the virgin compression line are as below : o₁ = 400 kPa, e₁ = 0.8; o₂ = 800 kPa, e₂ = 0.75 In the field, a 3 m thick normally consolidated layer of this soil subjected to construction load and the average effective vertical stress increased from 250 kPa to 450 kPa. Determine : (i) the compression index and initial void ratio of the clay layer, (ii) the consolidation settlement of the layer, and

The coordinates of two points on the virgin compression line are as below : o₁ = 400 kPa, e₁ = 0.8; o₂ = 800 kPa, e₂ = 0.75 In the field, a 3 m thick normally consolidated layer of this soil subjected to construction load and the average effective vertical stress increased from 250 kPa to 450 kPa. Determine : (i) the compression index and initial void ratio of the clay layer, (ii) the consolidation settlement of the layer, and

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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A 5 m thick saturated soil stratum has a compression index of 0.25 and coefficient of permeability 3.2*10^(-3) mm/sec. If the void ratio is 1.9 at vertical stress of 0.15 N/ mm^2, compute the void ratio when the vertical stress is increased to 0.2 N/mm^2. Also calculate settlement due to above stress increase and time required for 50% consolidation?
a=1 b=5 c=5 d=0
The layer is subjected to a uniform vertical stress increase of 100 kPa. The singly-drained clay layer has a coefficient of consolidation of 20 ft2 /yr. Determine the value of the excess pore pressure at point A 2 years after the application of the load. Also given is the chart giving the local degree of consolidation. a)4.4 kPa b)44 kPa c)88 kPa d)96 kPa
Answer in three decimal places please
Answer in three decimal places please
Answer in three decimal places please
First time post
A stratum of clay is 2m thick and has an initial vertical effective stress of 50 KN/m2. The foundation load caused an increased pressure of 40 KN/m2 at the mid-layer of clay. Consolidation test revealed the following results: overconsolidation ratio (OCR) = 1.5 Compression index = 0.25 Recompression index = 0.05 Secondary compression index = 0.02 Initial void ratio = 0.90 Determine the following a. the primary consolidation settlement of the clay layer (in mm). b. If the primary consolidation settlement took 2 years to achieve in the field, calculate the secondary consolidation settlement after a period of 5 years (in mm). c. the preconsolidation pressure (in KPa. Note: Kindly give all right solutions with clear calculations.
A normally consolidated clay layer 4.38 m. thick has a void ratio of 1.06. Liquid limit is equal to 37 and the average effective stress on the clay layer was 79 kPa. The average stress on it is increased to 117 kPa. as result of the construction of a foundation. If the clay layer is preconsolidated, compute the consolidation settlement in millimeters if the preconsolidation pressure is 138 KPa. Use Cs = 1/6Cc.
The thickness of a saturated specimen of clay under a consolidation pressure of 100 kN/m2 of is 24 mm and its water content is 20%. On increase of the consolidation pressure to 200 kN/m2, the specimen thickness decreases by 3 mm. Determine the compression index for the soil if the specific gravity of the soil grains is 2.70. a.0.92 b.0.56 c.0.63 d.0.52