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Monday, July 13, 2020 | History

2 edition of study of the shear strength characteristics of fibrous peat. found in the catalog.

study of the shear strength characteristics of fibrous peat.

Stephen A. Matthews

study of the shear strength characteristics of fibrous peat.

by Stephen A. Matthews

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Published by University of Salford in Salford .
Written in English


Edition Notes

MSc thesis, Civil Engineering.

ID Numbers
Open LibraryOL20904757M

  Peat deposits are complex natural formations encountered in many geographical areas. Peat itself is considered as a challenging geomaterial, with many aspects of its behaviour seemingly remaining enigmas. This state-of-the-art review paper provides an extensive summary of current knowledge on the strength and shear behaviour of fibrous :// The tests for the determination of the engineering characteristics involve shear strength, consolidation, and permeability tests. The test results show that the peat soil in Ogan Ilir can be classified as fibrous peat with degree of decomposition (H4–H5 in von Post scale) and fiber content > 20 %.

  tests for the determination of the engineering characteristics involve shear strength, consolidation, and permeability tests. The test results show that the peat soil in Ogan Ilir can be classified as fibrous peat with degree of decomposition (H 4–H 5 in von Post scale) and fiber content > 20 %. The average natural moisture content of the peat is Peat soils are challenging soils which are a problem for many geotechnical engineers especially in the design of shallow foundations and road constructions. The engineering properties of peat are dependent on the nature of its physical properties. Micro structural studies done on the soil shows that it consists of fibres which cause the soil to be highly compressible resulting in excessive

The ASTM standard provides guidelines for the drained direct shear test (DST) and requires the samples to be sheared at rates estimated from time to failure, \(t_{f} \ge 50t_{50}\) (where \(t_{50}\) is the time required to achieve 50% consolidation). This paper investigates the potential of estimating the undrained strength of peat in the DST owing to its ease of accessibility and simplicity Furthermore, the hemic and sapric peat had lower shear strength than the fibrous peat. The first-of-its-kind study was the first step on the road to persuade researchers to improve these problematic soils


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Study of the shear strength characteristics of fibrous peat by Stephen A. Matthews Download PDF EPUB FB2

In study of the shear strength characteristics of fibrous peat. book experimental study, peat samples were sheared at various displacement rates at \(t_{f} /t_{50}\) values of – and shear strength of fibrous peats using data from laboratory /_Effective_stress_strength_testing_of_peat.

Effective-stress strength analysis is also routinely performed (e.g. for FE modelling of embankments and dikes on fibrous peat and highly organic clay (den Haan and Feddema, ; Rowe et al., ) and highway construction in peat bogs), with both the undrained and effective-stress strength approaches discussed in greater detail in the above are the high shear strength and low compressibility characteristics of peat soils.

This study investigates the effects of the cement columns’ composition on shear strength For surficial fibrous peat deposits the ratio of vane shear strength to preconsolidation pressure is nearas compared to to for inorganic soft clay and silt deposits.

For fibrous peats, the ratio of undrained Young’s modulus to undrained shear strength is in the range of 20 to (ASCE)()(). For surficial fibrous peat deposits the ratio of vane shear strength to preconsolidation pressure is nearas compared to to for inorganic soft clay and silt ://   A series of laboratory and field test have been carried out to study the deformation and shear strength characteristics of tropical peat and organic soils.

For the study on deformation, samples were collected from nine different locations in the state ofjohore, Perak, Sarawak and Selangor, generally at Abstract- Peat soil is a very soft soil with low shear strength, high organic matter, and high compressibility exists in unconsolidated state.

These characteristics of soils can cause an excessive settlement which is very challenging to geotechnical engineers and the construction industry This project presents laboratory finding on the compressibility and shear strength characteristics of fibrous peat with sand column.

The peat used in the study is classified as fibrous peat and H1 Cement is widely used for the stabilization of peat by deep mixing method. This paper presents the results of the shear strength parameters of study models (fibrous, hemic and sapric peats stabilized with columns formed by dry mixing method).

The columns were formed of peat treated with cement in Peat in the study area in Northern Manitoba has an average thickness of 4 m, with the upper half classified as fibrous and the lower half as amorphous with strong to complete decomposition.

Design, construction, and maintenance procedures for new road embankments on seasonally frozen peat deposits require mechanical, hydraulic, and thermal (ASCE)MT characteristics of fibrous peat soils water content and shear strength of peat soil in the Banyuasin Regency, South Sumatra Province.

[3] study about the shear strength parameter for peat soil sample. Temperature is a measure of the heat or cold of an air. Changes in air temperature are caused by a problematic, due to their high compressibility and low shear strength.

Cement is widely used for the stabilization of peat by deep mixing method (DMM). This paper presents the results of the model study of compressibility properties of fibrous, hemic and sapric peats, stabilized with columns formed by ://   Peat has been considered a problematic geotechnical material, with extremely high water content, low shear strength and high compressibility.

Although initially high, fibrous peat undergoes   [2] peat “ is invariably found with significant moisture content at the surface of the ground, within a depth of between 2 and 15 meters.” Peat soils exhibit low values of undrained shear strength in natural conditions [3,4].

Natural peats contain very high water content, “ low strength, high compressibility and high shrinkage Peat is a naturally occurring material that is high in organic matter, extremely soft, has a high moisture content, and exists in an unconsolidated state.

Due to its high compressibility and low shear strength, peaty soils are geotechnically problematic. One of the most common methods for improving these soils is the dry mixing method.

Important characteristics of peat are the presence of The undrained shear strength of peat is kPa, with sensitivity of The initial permeability is high, but it decreases significantly with applied pressures. The fibrous peat has a high compressibility with significant secondary compression stage, which is not constant with the logarithmic of These soils are geotechnically problematic, due to their high compressibility and low shear strength.

Cement is widely used for the stabilization of peat by deep mixing method (DMM). This paper presents the results of the model study of compressibility properties of fibrous, hemic and sapric peats, stabilized with columns formed by ://   Peat is an extreme form of soft soil and is considered problematic due to the low shear strength and large compressibility.

This project presents laboratory finding on the compressibility and shear strength characteristics of fibrous peat with sand column.

The peat used in the study is classified as fibrous peat and H 1 –H 4 in Von Post scale The results showed that the peat soil found in Kampung Bahru, Pontioan can be classified as fibrous peat with a very high organic content which is typical of peat soil in Peninsular Malaysia.

Degree of decomposition according to von Post scale is H4. undrained shear strength is very low ( kPa); the fact discourages the construction work to   Table Shear strength parameters of peat 27 (location: Bukit Changgang, Selangor) (Singh and Bujang, ) Table Basic properties and laboratory shear box test results of peat 28 soils (Al Raziqi et al., ) Table Moisture content of soil samples Table pH and shear strength behaviour of peat soil.

Peat soil are characterized by high compressibility parameters and low initial shear strength. Block sampling method was used to obtain undisturbed sample.

The results of this paper describe the characteristics of peat soil from physical and chemical ://  The authors reported that the shear strength reached its maximum value after about 30 days of curing after which the variation was minimal.

Some studies were also undertaken with the stabilization period of fibrous peat with curing varying from 28 to ://  The chapter presents the physical and engineering properties of tropical peat treated with various types of stabilizers.

Quick lime (QL), fly ash (FA), and ordinary Portland cement (OPC) were used as stabilizers. The amounts of QL, FA, and OPC added with the peat samples are in the range of 2–8, 5–20, and 5–20%, respectively. Various physical or index and engineering tests have been