QI- An embankment is to be constructed over a layer of soft clay 16 m thick as shown in figure 1. Construction the embankment will increase the total vertical stress in the clay layer by 110 kPa. The design requirement is that all but 25 mm of the settlement due to consolidation of the clay layer will have taken place after 6 months. Determine: A. The spacing in best pattern of 500 mm diameter sand drains to achieve the above requirement. B. Which is the best, the use of sand drains or pre-fabricated drains? Why? (25%) Embankment Clay Cy = 4.7 m?/ year Ch 7.9 m2/ year my= 0.25 m2/ MN 16 m Sand Figure (1).

QI- An embankment is to be constructed over a layer of soft clay 16 m thick as shown in figure 1. Construction the embankment will increase the total vertical stress in the clay layer by 110 kPa. The design requirement is that all but 25 mm of the settlement due to consolidation of the clay layer will have taken place after 6 months. Determine: A. The spacing in best pattern of 500 mm diameter sand drains to achieve the above requirement. B. Which is the best, the use of sand drains or pre-fabricated drains? Why? (25%) Embankment Clay Cy = 4.7 m?/ year Ch 7.9 m2/ year my= 0.25 m2/ MN 16 m Sand Figure (1).

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

Sediment transport

Sediment transport or Soil transport is the movement of solid particles, usually due to the combination of gravitational forces acting on the sediment, and the movement of the liquid at which the sediment enters. Soil erosion occurs in natural systems where the particles are sandstones (sand, rocks), mud, or clay; the liquid is air, water, or ice; and the gravitational force that works to move particles to the landing surface. Sediment transportation or soil migration due to the movement of liquids occurs in rivers, lakes, lakes, oceans, and other bodies of water as a result of currents and waves. Transportation is also caused by glaciers as they flow, and to places on earth under the influence of wind. Soil erosion due to gravity alone is possible in most sloping areas, including hills, scarves, cliffs, and the continental shelf — the continental boundary of the slope.

Question

Ql- An embankment is to be constructed over a layer of soft clay 16 m thick as
shown in figure 1. Construction the embankment will increase the total
vertical stress in the clay layer by 110 kPa. The design requirement is that all
but 25 mm of the settlement due to consolidation of the clay layer will have
taken place after 6 months. Determine:
A. The spacing in best pattern of 500 mm diameter sand drains to achieve the
above requirement.
B. Which is the best, the use of sand drains or pre-fabricated drains? Why?
(25%)
Embankment
Clay
Cy = 4.7 m2/ year
Ch = 7.9 m2/ year
mv= 0.25 m2/ MN
16 m
Sand
Figure (1).

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