Creep behaviour of intact and remoulded fibrous peat

Acharya, Mohan P.; Hendry, Michael T.; Martin, C. Derek

doi:10.1007/s11440-017-0545-1

Cited by 7 publications

(7 citation statements)

References 32 publications

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“…More details about this creep model and more advanced ones for soft and frozen soils can be found in previous studies. [1][2][3][4][22][23][24]…”

Section: Soft and Frozen Soilsmentioning

confidence: 99%

“…In the literature, the behavior of soft or frozen soils is associated to inelastic or viscoplastic deformations. [2][3][4][5] Those deformations can cause the collapse of infrastructure elements. In geomechanics, predicting creep by salt rocks is essential for planning underground excavations for nuclear-waste repositories and storage structures for hydrocarbon reserves.…”

Section: Introductionmentioning

confidence: 99%

“…From a material or local point of view, different constitutive models based on creep laws have been proposed for geotechnical applications in soft and frozen soils [1][2][3][4][22][23][24] as well as for geomechanical applications in salt rocks. 6,7,[10][11][12]14,25 Those models provide relationships to determine creep rates dependent on stress, temperature, and time.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Integration schemes with substepping algorithms for creep analysis in geomaterials

Quevedo

Firme

Roehl

2019

Num Anal Meth Geomechanics

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Summary This paper describes a robust and efficient methodology for predicting displacements, deformations, and stresses in geomaterials that are susceptible to creep. The methodology is based on two integration schemes, which consider substepping algorithms. The first scheme is used for integrating space‐time relations in a global sense, whereas the second scheme is used for integrating stress‐stain relations in a local sense. Different from previous studies, both integration schemes are easy to implement and general in the sense that they can be applied to any type of creep law. Through an in‐house finite element simulator, several numerical tests are performed. They include triaxial and wellbore closure analyses considering soft soils and salt rocks. The results show that the combination of both schemes leads to stable and accurate solutions with reduced computational time.

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“…More details about this creep model and more advanced ones for soft and frozen soils can be found in previous studies. [1][2][3][4][22][23][24]…”

Section: Soft and Frozen Soilsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Integration schemes with substepping algorithms for creep analysis in geomaterials

Quevedo

Firme

Roehl

2019

Num Anal Meth Geomechanics

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“…Whiles studying this process, it was found that temperature [13,14], stress conditions, and the over consolidation ratio influence the consolidation characteristics of peat soil [15,16].…”

Section: Introductionmentioning

confidence: 99%

Controlling Conditions of the One-Dimensional Consolidation Test on Peat Soil

et al. 2021

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This paper studies the changes in the loss on ignition (LOI), total nitrogen content (TN), and strain in a one-dimensional consolidation test on peat soil. The effects of small-range fluctuations in the ambient temperature and changes in the sample height on the consolidation process of peat soil are proposed and verify the inhibitory effect of thymol on the decomposition of organic matter. The results show that when the ambient temperature fluctuates in a small range, the consolidation rate is significantly affected. Under a low load, the ambient temperature increases by 1–2 °C, and the consolidation rate can be increased by up to 10 times. This study presents the changes in loss on ignition (LOI) and total nitrogen content (TN) during consolidation, which proves that soaking the samples with a thymol solution can effectively control the decomposition of organic matter in peat soil. The strain of peat soil at a height of 30 mm is greater than or equal to that of other height samples, while that of mucky soil is 20 mm. Therefore, 30mm is the recommended sample height for peat soil for the one-dimensional consolidation test.

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“…These considerations call for an adequate geotechnical description of the prefailure response of these materials. The volumetric behaviour of peat, with particular attention to creep, has been widely investigated both from the experimental and the constitutive viewpoints (Berry and Poskitt; Berry and Vickers; Landva and La Rochelle; Lefebvre et al; Tsushima; Fox et al; Edil et al; Fox and Edil; Den Haan and Edil; Mesri et al; Den Haan and Kruse; Mesri and Ajlouni; Madaschi and Gajo; Acharya et al; Fox et al; Den Haan; Madaschi and Gajo). However, only few contributions focus on the modelling of the deviatoric behaviour of peats.…”

Section: Introductionmentioning

confidence: 99%

Applicability of hypoplasticity to reconstituted peat from drained triaxial tests

Muraro

Maš́ın

Jommi

2018

Num Anal Meth Geomechanics

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Summary Proper understanding of the deviatoric behaviour of peats represents a challenge in soil mechanics. Exceptional high compressibility together with extremely high friction angles distinguishes peats from classical organic soils. Considerable amount of triaxial test data on peats can be found in the literature, mostly coming from standard undrained triaxial compression tests. However, only a minor part was intended to describe their prefailure behaviour. Also, limiting the investigation to the undrained response reduces the information on those ingredients of constitutive models, which are necessary to describe the deformational behaviour. This contribution aims to provide better insight into the prefailure deformational behaviour of peats, by analysing in detail the results of non‐standard drained tests at various stress paths and undrained tests performed on reconstituted peat samples. Based on the experimental findings, an existing hypoplastic model, originally developed for fine‐grained soils, has been adapted to capture the behaviour of peats. The model is directly calibrated on selected experimental results and validated on a variety of different stress path tests. The results reveal the merits of hypoplasticity in modelling the nonlinearity of the prefailure behaviour and the directional response of peats, which both are of great importance when assessing the serviceability limit states of geotechnical structures founded on peats.

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Creep behaviour of intact and remoulded fibrous peat

Cited by 7 publications

References 32 publications

Integration schemes with substepping algorithms for creep analysis in geomaterials

Integration schemes with substepping algorithms for creep analysis in geomaterials

Controlling Conditions of the One-Dimensional Consolidation Test on Peat Soil

Applicability of hypoplasticity to reconstituted peat from drained triaxial tests

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