Study on the Microstructure Feature and Strength Mechanism of the Tien Lake Peat Soil

Liu, Yü; Cao, Guangzhu; Meng, Yin Gui; Liu, Meng Xin

doi:10.4028/www.scientific.net/amr.864-867.2695

Cited by 8 publications

(3 citation statements)

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“…Lv et al ( 2011 ) obtained the results that the average void diameter is about 10 μm and the large void is up to 25 μm diameter for peat samples from northern east China. Xiong ( 2005 ) and Liu et al ( 2014b ) got the average void diameter is about 13.65 μm for peat samples from Kunming. A void diameter range of 3–20 μm is obtained by Wang ( 2013 )and their tested peat samples are from Hangzhou, east China.…”

Section: Basic Descriptions Of Peatmentioning

confidence: 99%

Deformation behaviors of peat with influence of organic matter

Yang

Liu

2016

SpringerPlus

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Peat is a kind of special material rich in organic matter. Because of the high content of organic matter, it shows different deformation behaviors from conventional geotechnical materials. Peat grain has a non-negligible compressibility due to the presence of organic matter. Biogas can generate from peat and can be trapped in form of gas bubbles. Considering the natural properties of peat, a special three-phase composition of peat is described which indicates the existence of organic matter and gas bubbles in peat. A stress–strain–time model is proposed for the compression of organic matter, and the surface tension effect is considered in the compression model of gas bubbles. Finally, a mathematical model has been developed to simulate the deformation behavior of peat considering the compressibility of organic matter and entrapped gas bubbles. The deformation process is the coupling of volume variation of organic matter, gas bubbles and water drainage. The proposed model is used to simulate a series of peat laboratory oedometer tests, and the model can well capture the test results with reasonable model parameters. Effects of model parameters on deformation of peat are also analyzed.

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Section: Basic Descriptions Of Peatmentioning

confidence: 99%

Deformation behaviors of peat with influence of organic matter

Yang

Liu

2016

SpringerPlus

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“…where F is the decomposition of turfy soil (%), V cs is the volume of plant residues, organic matter, and mineral particles in the carboniferous soil, V c ′ is the volume of undecomposed plant residue after baking (cm 3 ), e is the void ratio of the turfy soil, and V c is the volume of the turfy soil before the test (cm 3 ). e decomposition results are shown in Table 1.…”

Section: Testsmentioning

confidence: 99%

“…Turfy soil is a special type of humic acid-rich humus soil [1] that possesses a unique set of soil properties, such as high organic matter, high compressibility, high moisture, high permeability, a high void ratio, and a low degree of decomposition [2] because of the unique external environment. It also possesses the general characteristics of soft soil, such as nonlinearity, expansion, contraction, plasticity, anisotropy, and rheology [3][4][5]. e expansion of large-scale construction projects in these turfy soil distribution areas reflects economic development trend, introducing several geotechnical engineering design concerns [6,7].…”

Section: Introductionmentioning

confidence: 99%

Physical and Mechanical Properties of Turfy Soils under Confining and Axial Pressure Increases Stress Paths in Jilin Province, Northeast China

Huang

Liu

et al. 2021

Advances in Civil Engineering

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In recent years, highways have been built rapidly in China’s turfy swamp areas to accommodate economic development. Turfy soil is a type of special soil with high humus and incompletely decomposed plant contents, so its properties are complex and unique. Both the axial and confining pressures of turfy soil increase during embankment filling. Therefore, in this study, three soil tests for analysing the decomposition degree, organic matter content, and triaxial compression under confining and axial pressure increases stress paths were performed to achieve insights into the stress-strain properties of turfy soil. The volumetric and deviatoric strains of turfy soil were summarised to reveal the inner mechanisms of turfy soil, culminating in the establishment of a constitutive model for turfy soil. The results of the constitutive model were compared with the experimental test results to verify the accuracy of the constitutive model. The results showed that the stress-strain and strength of turfy soil are closely related to the organic matter content and decomposition degree. The calculated stress and strain results are also consistent with the experimental results, indicating that this constitutive model can be used to better indicate the original deformation state and strength characteristics of the turfy soil.

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