scholarly journals Compressibility behaviour and engineering properties of North Borneo Peat Soil

2021 ◽  
Vol 10 (3) ◽  
pp. 259-268
Author(s):  
Habib M. MOHAMAD ◽  
Adnan ZAİNORABİDİN ◽  
Baba MUSTA ◽  
M. Nursyahrain MUSTAFA ◽  
Adriana Erica AMALUDİN ◽  
...  
Keyword(s):  
Peat Soil ◽  
Engineering Properties ◽  
North Borneo

Analysis on Rheological Properties of Peat Soil in Kunming Area

2012 ◽  
Vol 204-208 ◽  
pp. 722-726
Author(s):  
Yi Peng Guo ◽  
Xiao Nan Wang ◽  
Zheng Fa Lai ◽  
Jun Qing Lv
Keyword(s):  
Rheological Properties ◽  
Stress Level ◽  
Peat Soil ◽  
Strain Curve ◽  
High Water ◽  
Engineering Properties ◽  
Dianchi Lake ◽  
High Water Content ◽  
Peat Soils ◽  
Loading And Unloading

Kunming area is adjacent to Dianchi Lake. Peat soil with high water content and high compressibility is widely distributed, rheological properties is one of the most important engineering properties of peat soil. However, compared with the peat soils in the other areas, the peat soil in Kunming area has different properties. This paper studied rheological properties of peat soil in Kunming area by using the creep test of loading and unloading, on the basis of the strain-time curves, parting linear visco-elasticity, linear visco-plasticity and nonlinear visco-plasticity from the total deformation. Research shows that: ①The deformation is mostly composed of unrecoverable deformation and there is instantaneous elastic strain, instantaneous plastic strain in total strain; ②In low stress level,the soil is rendered as visco-elasticity. However, when the stress level is high, the performance of soil is visco-plasticity; ③By stress-strain curve clusters, yield stress of peat soil is approximate to 3.6 kPa in Kunming; ④Along with the time, modulus of linear visco-elasticity tended to be stable.

scholarly journals Investigation of the Application of Various Water Additive Ratios on Unconfined Compressive Strength of Cement-Stabilized Amorphous Peat at Different Natural Moisture Contents

2018 ◽  
Vol 2018 ◽  
pp. 1-9
Author(s):  
Atikah Rahmi ◽  
Siti Noor Linda Taib ◽  
Fauzan Sahdi
Keyword(s):  
Compressive Strength ◽  
Moisture Content ◽  
Unconfined Compressive Strength ◽  
Peat Soil ◽  
Soil Improvement ◽  
Engineering Properties ◽  
Soil Reaction ◽  
Moisture Contents ◽  
Ucs Test ◽  
Cement Soil

Natural peat is considered incapable of supporting built structure due to its poor engineering properties. Chemical stabilization is one of the peat soil improvement methods which has been studied by many researchers. This study describes an investigation of water additive (W/A) ratio application on cement-stabilized peat strength. Peat soil at different moisture contents, which are 1210%, 803%, and 380%, were stabilized with cement by W/A ratio of 2.0, 2.5, 3.0, 3.5, and 4.0. Unconfined compressive strength (UCS) test was conducted after the specimens were being air-cured for 28 and 56 days. The result shows that there is an increase of UCS value as the decrease of W/A ratio (the increase of cement dosage) and the increase of curing time and peat moisture content. The higher strength found in the specimen with higher moisture content, compared to the lower one at the same W/A ratio, shows that the mix design of cement-stabilized peat using W/A ratio should have differed under different peat natural moisture contents. From the result, it is also found that cement hydrolysis reaction occurred despite the presence of humic acid in the peat soil, which by many studies is assumed will hinder the cement-soil reaction.

scholarly journals The Technology and Application of Improving Bearing Capacity of Deep Peat Soil Subgrade

2021 ◽  
Vol 272 ◽  
pp. 01010
Author(s):  
Xiuling Cao ◽  
Muci Yue ◽  
Haiyan Xu ◽  
Song Chen ◽  
Yongkang Hou ◽  
...  
Keyword(s):  
Bearing Capacity ◽  
Peat Soil ◽  
Engineering Properties ◽  
Distribution Area ◽  
Chinese Library Classification ◽  
The World ◽  
Key Technologies ◽  
Belt And Road ◽  
Soil Foundation ◽  
The Belt And Road

Peat soil is widely distributed in more than 500 countries around the world, covering an area of over 4 million square kilometers, among which the distribution area in China is about 40000 square kilometers, and most of Peat soil is distributed in swamps and forests. Peat soil is with high content of organic matter, poor engineering properties and low bearing capacity, which is very unfavorable to the safety and functionality of infrastructure construction. The Belt and Road, and the other two parts of the peat soil are studied in this paper. The key technologies of peat soil foundation are studied through literature review and comparative study. This will provide theoretical and technical support for repairing bridges, roads and houses in the distribution area of peat soil, and provide the theoretical basis and technical foundation for the construction of the “peat” Road area. Chinese Library Classification: TU08

scholarly journals Assessment of compressive strength of peat soil with sawdust and Rice Husk Ash (RHA) with hydrated lime as additive

2019 ◽  
Vol 258 ◽  
pp. 01014
Author(s):  
Noorfaizah Hamzah ◽  
Nur ‘Ain Mat Yusof ◽  
Muhammad Ihsan Haziq Mohd Rahimi
Keyword(s):  
Compressive Strength ◽  
Rice Husk ◽  
Soil Stabilization ◽  
Rice Husk Ash ◽  
Soft Soil ◽  
Peat Soil ◽  
Hydrated Lime ◽  
Soil Improvement ◽  
Engineering Properties ◽  
Strength Capacity

Construction activities on peat soils are found to be extremely difficult as the soil is profound as soft soil and has low shear strength and high moisture content. Due to alternating swelling and shrinkage nature, it causes serious damage to the structure above it. This happens due to repetition of drying and wetting of soil. Stabilization of soil is commonly applied to improve the mechanical properties of soil prior to soil engineering works. This soil improvement method is advantageous and effective one by using waste materials. Waste in our country is divided in various types and it includes domestic wastes, industrial wasters, agricultural wastes etc. Because of difficulties to diminish these wastes without affect to environment and surroundings, it can be used as a stabilizing agent in the soil. Therefore, this experimental study carried out to evaluate the effect of Rice Husk Ash (RHA) and sawdust on engineering properties of the peat soil. The properties such as compaction and unconfined compressive strength are determined separately with sawdust and added of RHA in peat soil at a variety of percentages (2.5%, 5% etc.) in addition small amount of constant rate of lime with 2% of the dry soil weight. By obtaining the results, it can deduce a promising and improving result in stabilizing the soil with sawdust and Rice Husk Ash in both economic and strength capacity. This will not only solve the waste disposal problem but also enhance the strength characteristics of soil significantly.

Study on the Difference between Turfy Soil and Normal Peat Soil in China

2011 ◽  
Vol 105-107 ◽  
pp. 1551-1554 ◽  
Author(s):  
Yan Lv ◽  
Lei Nie ◽  
Kai Xu ◽  
Zhan Dong Su
Keyword(s):  
Peat Soil ◽  
Specific Weight ◽  
High Water ◽  
Structural Features ◽  
Organic Content ◽  
Engineering Properties ◽  
High Water Content ◽  
Consolidation Coefficient ◽  
The Difference ◽  
High Organic Content

As the special soil, turfy soil and peat soil in China contained some similar properties with high void ratio, high water content, high organic content, etc. But turfy soil also had properties which difference from peat soil. In this paper, based on the formation of the cause and geological environment and geomorphologic characteristics of geological in the quaternary, took the typical and widespread turfy soil and peat soil regions for example, systematically discussed the material composition and macroscopic and microcosmic structural features, put further research on the physical chemistry mechanical characteristics. Then the come to the conclusion that the essential reason for difference between turfy soil and peat soil were decomposition degree and organic content. The result that worse engineering properties such as higher the moisture content, porosity, compressibility, internal cohesion and the lower specific weight, consolidation coefficient and permeability were due to the lower decomposition degree and higher organic content of turfy soil than peat soil. It can provide reference to the practical projects of turfy soil to distinguish peat soil according to this characteristic.

ENGINEERING PROPERTIES OF PEAT IN OGAN ILIR REGENCY

2016 ◽  
Vol 78 (7-3) ◽  
Author(s):  
Yulindasari Sutejoa ◽  
Ratna Dewi ◽  
Yulia Hastuti ◽  
Reffanda Kurniawan Rustam
Keyword(s):  
Peat Soil ◽  
Engineering Properties ◽  
Angle Of Internal Friction ◽  
Peat Deposits ◽  
Undisturbed Samples ◽  
Fibrous Peat ◽  
Block Sampling ◽  
Ignition Loss ◽  
Physical Tests ◽  
Effective Angle

Seventeen percentages of Sumatra is covered with peat deposits. Some 1.6 million Ha is deposited in the East coast of South Sumatra. More over, 63.503 Ha is found in Ogan Ilir Regency. Laboratory soil tests are performed to determine the engineering properties of the peat. Generally the tests use undisturbed samples obtained with a block sampling from sites in Ogan Ilir Regency, but the physical tests for specific gravity, water content, and ignition loss occasionally employ disturbed samples. 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 %. The average natural moisture content of the peat is 441,933 %. The average results of direct shear test showed the effective cohesion (c’) and the effective angle of internal friction (’) are 7.62 kPa and 19.930. The average coefficient of rate of consolidation (cv) obtained from Oedometer test ranged from 3.20 from 0.93 for pressure range of 25 to 400 kPa. In general, the results show similar values with the reference data of other peat soils.

scholarly journals Analysis of leachate from solidified peat soil

2018 ◽  
Vol 250 ◽  
pp. 06015 ◽  
Author(s):  
Ali Hauashdh ◽  
Radin Maya Saphira Radin Mohamed ◽  
Junita Abd Rahman ◽  
Junaidah Jailani
Keyword(s):  
Inductively Coupled Plasma ◽  
Peat Soil ◽  
Soil Column ◽  
Bottom Ash ◽  
Engineering Properties ◽  
Wet Season ◽  
Soil Leachate ◽  
Inductively Coupled ◽  
Model Soil ◽  
Wet Condition

Peat soil is very compressible where this characteristic is lead to an excessive settlement. Solidification of peat soil is a method to improve engineering properties of peat soil. Currently, solidification of peat soil is increasing, wherefore it is a critical need to study the environmental effects from solidified peat soil leachate due to solidification peat mixtures usually used materials of generation wastes from coal-fired electric power. The effect of leachate from solidified peat to the environment is one of the most important criteria that should be investigated. This study aims to investigate the environmental impacts of leachate from solidified peat affected by rainwater. In this study, solidification of hemic peat soil was done by mixing hemic peat soil with ordinary Portland cement (OPC), fly ash (FA) and bottom ash (BA). Leachate is the liquid that has percolated through a soil column outlets. Therefore, this study was to analysis the leachate from solidified hemic peat when it is saturated by rainwater in two different conditions, which are a dry and wet season by using physical model (soil column). The leachate samples were analyzed by using Ionic Chromatography (IC) and Inductively Coupled Plasma Mass Spectrometry (IC-MS). The anions concentration of leachate from solidified peat has increased for Cl-SO42-in wet condition as result rainwater inflow was increased during the wet condition, and the chemical composition of rainwater contains Cl-and SO42-. The concentration of cations on the leachate from solidified peat has increased at Fe+2 and Al+3 in wet condition, which proven solidified peat has an effect on the leachate In comparison with leachate of non-solidified peat. The concentration of anions for Cl-and SO42-the leachate still consider in the normal range of groundwater concentration that classified as freshwater, but in case FA, BA, and OPC are used excessively in the mixture for solidifying peat in a wetland, leachate from solidified peat will effect on elements concentration of groundwater and land properties.

scholarly journals Engineering Properties and Compressibility Behavior of Tropical Peat Soil

2007 ◽  
Vol 4 (10) ◽  
pp. 768-773 ◽  
Author(s):  
Youventharan Duraisamy ◽  
Bujang B.K. Huat ◽  
Azlan A. Aziz
Keyword(s):  
Peat Soil ◽  
Engineering Properties ◽  
Tropical Peat

Effect of Humic Acid on Geochemistry Properties of Kaolin

2013 ◽  
Vol 701 ◽  
pp. 310-313 ◽  
Author(s):  
Faizal Bin Pakir ◽  
Ahmad Tarmizi Bin Abdul Karim ◽  
Felix N.L. Ling ◽  
Khairul Anuar Kassim
Keyword(s):  
Organic Matter ◽  
Humic Acid ◽  
Specific Gravity ◽  
Peat Soil ◽  
Atterberg Limits ◽  
Engineering Properties ◽  
Organic Soils ◽  
Dry Density ◽  
Loss On Ignition ◽  
Maximum Dry Density

Organic soil is always known as problematic soil because of its engineering properties are inferior from other soft soils and/or because its behaviour may deviate from traditional rules of soil behaviour which makes it difficult to predict and design. Considerable research has been carried out over the years on organic soils, particularly peat soil which consists of various components of organic matter but the effect of particular organic matter is less reported. Hence, this study is carried out to determine the effect of humic acid (a kind of humified organic matter) on kaolin (which is widely studied). This paper addresses the influence of humic acid (30% and 50% of dry mass) on kaolins geochemistry properties namely Atterberg limits, compaction, specific gravity and Loss on Ignition (LOI). The findings of the study showed that the contents of humic acid had altered the behaviour of kaolin. The loss on ignition increased linearly with the increment of humic acid. However, the specific gravity, maximum dry density and Atterberg limits decreased with addition of humic acid. Atterberg limits decreased as the humic acid increased is believed to be due to the nature of humic acid which precipitated under acidic environment.

Sign in / Sign up

Export Citation Format

Share Document