Effects of Fiber Reinforcement on Soft Clay Shear Strength Analysis

This report investigates the effects of fiber reinforcement on the shear strength of soft clay. The study explores the use of fibers, such as recycled plastic noodles, to enhance the mechanical properties of clay soil. The introduction provides background information on the technology of fiber reinforcement, highlighting its historical use and modern applications in the construction industry. The objectives include investigating the reinforced clay strength, studying the failure deviator stress, and establishing the relationship between shear strength and fiber-clay. The report details the materials used, including the clay soil and plastic fibers, and describes the methodology, including direct shear tests. The results indicate that fiber reinforcement can increase the shear strength of clay. The conclusion summarizes the findings, noting that efficient strength of the fiber-clay mixture can significantly reduce with drainage and time. References are included to support the research findings.

Effects of Fiber
Reinforcement on Shear
Strength of Soft clay
Introduction

Introduction
The technology of using fibers in the clay reinforcement is not new. The
civilization of ancient time used hay and straw for muddy blocks
reinforcements to make building blocks. By the use of the same
technique from the old civilization, the fibers can be reinforced to soils
to create strong blocks for construction. In the modern world fiber is
used widely. The standard of soil reinforced is actually defined as a
mass of soil mixed with particles of fiber materials to improve the
mechanical behaviors of the soil composite. (Patel,.

Objectives of the study
.
a. Investigate the reinforced clay strength with other materials
b. Study the stress of the failure deviator of medium reinforced fiber-clay.
c. Establish the relationship between shear strength and fiber-clay

Benefits of the reinforced fiber clay
In construction industry used because of:
 High shear strength.
 High compressive force need to crush it
 Great internal friction and cohesion angle
 Tile making
Pottery Industry
 Design and making of cups, pots and plates

Study of the
scope
The focus is all about what happens
when the clay is reinforced with fiber.
Also to investigate when the strength
of clay increase after reinforcement.
Also the shear strength parameters
are checked.
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Problem
statement
It usually known that clay soil has very
low un-drained shear strength; requires
a long period of time to improve the
shear strength to high value. Hence the
adapted to clay from a specified locality
and the behavioral shear strength will
be observed and evaluated
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Shear
Strength of
Clay soil
Formula of the shear
strength

Shear
Strength of
Clay
reinforced
with clay The use of fiber to reinforce clay
has be proved to be the most
significant by raising the shear
strength of clay soil

Shear Strength of Clay
reinforced with clay
The highest shear strength
usually occur at the highest
optimum moisture content while
the smallest occur within
saturated state.

diagram of
Inter particle
interactions The inter particle can
influence the shear strength
directly.

Table 2.1: the
reinforced soil
shear
parameters
The oil fiber has the highest shear strength
increase to clay which is about 0.75.From
the table left side we can see the shear
strength increased as a result of fiber
reinforcement in the soil.

Material
used The clay soil used in this study and the recycled plastic
noodles fiber. The soil used for investigation is of minimal
liquid limit. The liquid as well as the plastic soil limits are
approximated to 22 and 30 respectively. In the figure
below it can be observed clay contain 49%, silt 29% and
soil 22%. The length of plastic used was 5mm.The
physical properties of plastic noodles used are in the
figure left side.

Direct Shear
Test The effects of reinforced
fiber (plastic noodles) on
the shear strength of soft
clay

Conclusion The results obtained from traxial tests show that the
strength reinforced clay was low for a longer-term absolutely
drained conditions, giving evidence that efficient strength of
the fiber-clay mixture can significantly reduce with drainage
and time. However, this reduction in strength initially was
attributed to move along the fiber-clay interface, the
outcome from program testing show that the impacts of
fibers on the pressures of the pore during testing of ICU may
provide a higher estimated effective strength.

References