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Consolidation of peat soils | SpringerLink

12%L. S. Amaryan, Methods of Determining Properties of Peat Soils [in Russian], Kalinin Polytechnical Institute (Kalininskii Politekhnicheskii Institut) (1970). 9. N. P. Kovalenko, V. D. Sokolov, and Ya. Yu. Marko, Study of Changes in Pore Pressure during Consolidation of Water-Saturated Soil [in Russian], Trudy ALTIg.

PEAT AND ORGANIC SOILS CHALLENGES IN ROAD …

The very soft compressible peat soils are excavated out and replaced with sand fill materials that provide a stronger and less compressible foundation. The experience on this road indicates that the excavation and ... Upon completion of pre-consolidation of road formation, surcharge was

SHEAR STRENGTH IMPROVEMENT OF PEAT SOIL DUE TO CONSOLIDATION

One major problem related to construction on peat deposit is the low shear strength of the soil. However previous researches have shown that the shear strength could increase significantly upon consolidation and hence some improvement methods have been developed to increase the bearing capacity of the peat deposit by utilizing consolidation pressure.

THE RATES OF CONSOLIDATION FOR PEAT

the rates of consolidation for peat. this investigation is concerned with the behavior, under load, of a characteristic peat type. an examination is made of the mechanics of consolidation to determine whether the dynamics involved constitute a simple process or …

PREDICTION OF FIELD COMPRESSIBILITY FROM LABORATORY ...

These predicted parameters are based on the results of one-dimensional consolidation tests and are valid for the zero lateral strain (K sub 0) state. The compressibility parameter b needs to be modified to incorporate the effects of unrestrained compression often observed in the field by researchers in the area of peat and organic soils.

(PDF) Consolidation Behavior of Peats

This study is a laboratory investigation of the consolidation. behavior of peat soils; the prediction of field consolidation behavior. is considered to be outside the scope of this study. Test ...

SARAWAK HEMIC PEAT CONSOLIDATION SETTLEMENT AND …

Keywords: Sarawak hemic peat, peat consolidation, degree of humidification, loss of ignition. INTRODUCTION Peat is defined as highly organic soil with the heterogeneous mixture of partially decomposed plant

SECONDARY CONSOLIDATION BEHAVIOUR OF …

2.3 Consolidation parameters for peat specimen by Johari (2016) 21 3.1 Von Post Scale: Degree of humification 25 3.2 Suggested initial pressure for oedometer test 35 4.1 Summarized basic properties of Kg. Meranek and Kg. Mang peat soil 42 4.2 Values of𝑐 𝑣 44 4.3 Values of 𝐶 𝑐 46 4.4 Values of 𝐶 𝛼 and 𝐶 𝑐 …

Geotechnical properties of peat soil stabilised with ...

75 kg m-3 of sand to peat soil, while Nikoo& kar Karimi Pashaki (2012) observed an increase in UCS from 45 kPa for untreated peat to 264.1 kPa when they added 10 % by weight of both cement and sand. According to ASTM D4609(standard guide for evaluating effectiveness of admixture for soil stabilisation), soil stabilisation is effective if the

End-of-primary consolidation of peat — Penn State

title = "End-of-primary consolidation of peat", abstract = "A program of end-of-primary (EOP) and long-duration odometer tests on both thick and thin specimens of a fibrous peat with the same aspect ratio has been performed. Conventional curve-fitting methods used for inorganic soils are found to be unreliable for this peat.

Engineering properties of peat soils in peninsular ...

A study on peatland in Peninsular, Malaysia was conducted to determine stratigraphy of peat layer, bearing capacity, physical properties, unconfined compressive strength and consolidation properties. Some conventional laboratory and field experiments were done to determine its physical and mechanical properties and to find the soil profile.

Consolidation Behavior of Peats - ASTM International

Four peat samples, covering a wide range of fiber contents, were subjected to one-dimensional consolidation tests. The development and dissipation of excess pore water pressure, effluent outflow, and permeability were also monitored during some of the consolidation tests.

Overconsolidation Ratio - an overview | ScienceDirect Topics

When a soil is loaded, say by the weight of an ice sheet or any other boundary load, it undergoes consolidation and the ground surface settles under the applied load. Once consolidation has occurred and the ice sheet melts away or the boundary load is removed, the unloaded soil tries to expand.

Strength and Compressibility Characteristics of Peat Soil ...

Hence, consolidation tests were carried out on untreated and treated peat soil to find the effect of secondary compression. Based on test results, void ratio versus time curves were drawn for untreated and treated peat soil by 12 % lime and 20 % fly ash. Figs. 3.15 to 3.17 show the void ratio versus time curve for untreated and treated peat ...

Experimental study on secondary consolidation ...

The variation rule and formation mechanism of secondary consolidation parameters were analyzed in detail. Test results show that the e - lg t curves of Kunming peat soil under different consolidation pressures show an inverse S-shape, the ratio of secondary consolidation deformation to total deformation is 32.8%.

Peat consolidation -- new approach - Archives of Civil ...

The problem of consolidation of soil has been widely investigated. The basic approach was given by Terzaghi who assumed soil of constant physical and mechanical parameters. In the case of peat consolidation, the permeability coefficient of soil and the elasticity modulus are functions of the settlement which is an important additional factor.

Geotechnical properties of peat soil stabilised with ...

terms, peat soil has high permeability, porosity ratio, compressibility and consolidation settlement; low pH, bulk density, bearing capacity and shear strength; and relatively low plasticity. Also, its particle-size distribution is different from that of inorganic soils. All of these …

(PDF) Peat Consolidation – New Approach

peat consolidation, the per meability coefficient of soil and the elasticity modulus are functions of. the settlement which is an important additional factor. The model proposed here assumes ...

Peat Consolidation with Bottom Ash - Theory and Practice

There have been proposed the following equation of the soil consolidation degree in the Swedish Geotechnical Institute: U =1−Aexp(−Bt) (3)-A – const, -B – the function of peat thickness, natural humidity w n and load σ, -t – time, [s]. There was differential equation used for calculating the peat consolidation …

Stabilization of peat soil using locally admixture

peat at field under consolidation for thirty years, Peat in natu-ral state is a highly permeable material and the magnitude of ... Peat soils are rich with water content and high porosity and in most cases its deposit is shallow from two to four meter under the surface ground as …

Three-stage consolidation characteristics of highly ...

The consolidation process of peat soil is not fully consistent with the primary and secondary consolidation stage, etc. As for consolidation stages, researchers have found that the consolidation stage of peat soil is different from that of common clay and have tried to determine different consolidation stages.

Effect of Different Peat Size and Pre-Consolidation ...

Shear strength of the soil is one of the most important parameters in engineering design, especially during the pre- or post-construction periods, since it is mainly used to measure and evaluate the foundation or slope stability of soil. Peat normally known as a soil that has a very low value of shear strength, and in order to determine and understand the shear strength of the peat, it is a ...

Geotechnical Properties of Peat Soil (24pgs)

increase. Buildings on peat are usually suspended on piles, but the ground around it may still settle. This study will focus on the properties and consolidation test on peat soils from two areas. Oedometer consolidation test are conducted for both samples taken from Kota Samarahan and Kuching. Several laboratory tests were also conducted

CONSTITUTIVE MODELS FOR PEAT A REVIEW

Key words: Constitutive Model, Consolidation Hypothesis, Peat, Organic Soils, Structural Anisotropy. Abstract. This paper presents a review of the main constitutive models for peat and other highly organic soils having extremely high water content. At present, predictions of the

Consolidation of peat soils | SpringerLink

L. S. Amaryan, Methods of Determining Properties of Peat Soils [in Russian], Kalinin Polytechnical Institute (Kalininskii Politekhnicheskii Institut) (1970). 9. N. P. Kovalenko, V. D. Sokolov, and Ya. Yu. Marko, Study of Changes in Pore Pressure during Consolidation of Water-Saturated Soil [in …

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curves of Kunming peat soil under different consolidation pressures show an inverse S-shape, the ratio of secondary consolidation deformation to total deformation is 32.8%. With the increase of consolidation pressure p, the Cα value of peat soil and general soft clay first increase rapidly to the peak value and then decrease gradually.

Compression Rates of Untreated and Stabilized Peat Soils

The technique is developed in such a way that dry binders are mixed with in situ peat soil to form columnar reinforcement in the deep peat ground prior to preloading. Preloading simulations of both untreated and stabilized peats were carried out in laboratory by loading of both soils using standard oedometer consolidation apparatus.

LONG TERM CONSOLIDATION STUDY ON THE TROPICAL …

determination of consolidation time, the first thing we need to know is the consolidation coefficient value and this value may be obtained from Oedometer Test. It was expected that the value of settlement is high since peat is very soft and easily compressed. The study of the long term consolidation of peat soil is important to predict the ...

Consolidation of Peat and Organic Soil using Electro ...

Consolidation of Peat and Organic Soil using Electro-osmosis Treatment Sharon Yee Jia Huey This thesis is presented for the Degree of Doctor of Philosophy of Curtin University December 2016 . ii . iii DECLARATION To the best of my knowledge and belief, this dissertation contains no material ...

Measurement, interpretation and recommended use of ...

For peat deposits, the fibre deposition and subsequent large vertical strains experienced during the one-dimensional (1D) consolidation in situ produce an inherent structural cross-anisotropy (Helenelund, 1967; Landva and Pheeney, 1980; Yamaguchi et al., 1985a), the degree of which is dependent on the material's level of humification (Hendry ...

Physio-Chemical Properties, Consolidation, and ...

Several attempts have been made to characterize and stabilize peat soil to make construction viable. This study encapsulates an extensive literature review of the available published data for Atterberg limits, consolidation, and stabilization of peat soil using traditional additives, especially cement and lime.

DETERMINATION OF COEFFICIENT OF RATE OF HORIZONTAL ...

peat soil. Results from constant head permeability reveal that the soil is almost isotropic as indicated by equal initial permeability in horizontal and vertical direction. Hydraulic consolidation tests in Rowe cell, the coefficient of rate of horizontal consolidation increases significantly with consolidation pressure, while the increase

Strength and Compressibility Characteristics of Peat Soil

peat soil increases with increase in lime percentage but after the optimum percentage of lime content, strength began to drop. It is observed that the peat soil stabilized with ordinary ... and Consolidation tests were conducted to determine the engineering properties of peat and stabilized peat soils.