A strength criterion for frozen clay considering the influence of stress Lode angle

Wang, Dayang; Ma, Wei; Lei, Lele; Li, Guoyu

doi:10.1139/cgj-2018-0054

Cited by 25 publications

(16 citation statements)

References 32 publications

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“…Compared with true triaxial compression apparatus, the principal stress level and its orientation under complex stress paths can be achieved comprehensively by controlling the axial load, torque, and inner and outer cell pressures independently using a torsional shear apparatus to replicate C-T action. Early torsional shear apparatuses were mainly used in the study of soft soils [27], but were later extended to frozen soils [28] and rocks [29,30], with the aim of developing strength criteria under complex stress states. But the aforementioned methods do not allow the visualization of specimens, which has limited our understanding of the microcosmic mechanisms therein.…”

Section: Geofluidsmentioning

confidence: 99%

Experimental Study on Compression and Torsion Fracture within 3D Printed Cementation-Weak and Porosity-High Sandstones

et al. 2023

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Cretaceous sandstones have weak cementation and high porosity while exhibit a high apparent brittleness. Compression and torsion (C-T) fractures are widely distributed in Cretaceous sandstones due to asymmetric tectonic convergence action. However, studies on C-T fracture formation and the mechanisms causing variability in Cretaceous sandstones containing no oil or gas are rare due to the challenges in sampling intact sandstone cores, despite their significance to mine shaft sinking. Therefore, this study used binder jetting-based 3D printing to prepare artificial Cretaceous sandstone and developed a real-time X-ray computed tomography- (CT-) aided torsion shear apparatus to test them. The test results showed that the 3D printed (3DP) sandstone had characteristic indexes that approached and even exceeded the lower limits of Cretaceous sandstone cores, thereby accurately representing the unavailable cores. Furthermore, the 3DP sandstones had anisotropic properties comparable to the sandstone cores. Under C-T action, the 3DP sandstone exhibited a pronounced strain gradient of 2.0 %/mm perpendicular to fracture inclination. The inclination angles of fractures formed under C-T action tended to increase as the cell pressure increased, and that approached the orientation angles of maximal principal stress. The maximal and minimal principal stresses exerted inclination-slip and width-stretching effects, respectively, on C-T fractures. But the effect of inclination-slip on the C-T fractures was stronger than that of width-stretching. This insight into C-T fracture formation will guide future studies on the fracture evolution and its disaster-dominating mechanisms arisen from disturbances by shaft sinking.

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Section: Geofluidsmentioning

confidence: 99%

Experimental Study on Compression and Torsion Fracture within 3D Printed Cementation-Weak and Porosity-High Sandstones

et al. 2023

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“…Various criteria have been developed to describe the strength characteristics of geomaterials, such as Lade-Duncan criterion, Drucker-Prager criterion, Mises criterion, and spatially mobilized plane strength criterion. According to a series of directional shear tests, Chen et al [28] found that generalized nonlinear strength theory (GNST) developed by Yao et al [42] can well present the strength evolution of frozen samples. The simulation data of GNST was in good agreement with test results in π plane.…”

Section: Shape Function In πmentioning

confidence: 99%

“…As for frozen soils, the strength characteristics can be rather complicated since the pore ice crystals can be crushed and melt at relatively high stresses. Many investigations were performed to research the strength of frozen geomaterials [21][22][23][24][25][26][27][28]. Compared with general geomaterials, the influence factor of frozen soil strength is more complicated, such as pressure, dry density, and temperature.…”

Section: Introductionmentioning

confidence: 99%

A Nonlinear Strength Criterion of Frozen Saline Sandy Soil at High Pressures

et al. 2022

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The strength of frozen saline soil is influenced by various factors, such as confining pressure, salt content, and temperature. To investigate the influences of these factors on strength parameters, a series of triaxial tests were performed for frozen saline samples. According to the test results, as the mean principal stress increases, the failure strength increases firstly and then reaches a peak value, followed by a decreasing tendency. The pressure corresponding to ice melting is higher for frozen samples at a lower temperature. A strength function, which consists of cohesion and friction components, is developed in p ‐ q plane. Then, the relationships between temperature and strength parameters are given by fitting the test data. The envelope between those for the SMP and von Mises criteria is employed to describe the strength properties in π plane. By comparing the predicted data with test results, the developed strength criterion can well reproduce the strength variation of frozen sandy samples considering the effects of confining pressure, salt content, and temperature.

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“…Many constitutive models (e.g., hyperelastic model, nonlinear elastic model, and viscoelastic-plastic model) have been established to describe the mechanical features of frozen soils [9][10][11][12][13][14]. In addition, on the basis of continuous damage theory, some constitutive models of frozen soil have also been established.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Modeling of Frozen Coarse‐Grained Materials Incorporating Microscale Investigation

Tang

Tian

et al. 2021

Advances in Materials Science and Engineering

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In the cold regions of China, coarse-grained materials are frequently encountered or used as backfilling materials in infrastructure construction, such as dams, highways, railways, and mineral engineering structures. Effects of confining pressure (0.2, 0.5, and 1 MPa) and frozen temperature (−2, −5, −10, and −15°C) on the stress-strain response and elastic modulus were investigated using triaxial compression tests. Moreover, the microscale structures of a coarse-grained material were obtained by X-ray computed tomography. The coarse-grained material specimens exhibited strain-softening and significant dilatancy behaviors during shearing. A modified model considering microstructures of the material was proposed to describe these phenomena. The predicted values coincided well with the experimental results obtained in this study and other literatures. The sensitivity analysis of parameters indicated that the model can simulate the initial hardening and post-peak strain-softening behavior of soils. And the transition of volume strain from contraction to dilatancy can also be described using this model. The results obtained in this study can provide a helpful reference for the analysis of frozen coarse-grained materials in geotechnical engineering.

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A strength criterion for frozen clay considering the influence of stress Lode angle

Cited by 25 publications

References 32 publications

Experimental Study on Compression and Torsion Fracture within 3D Printed Cementation-Weak and Porosity-High Sandstones

Experimental Study on Compression and Torsion Fracture within 3D Printed Cementation-Weak and Porosity-High Sandstones

A Nonlinear Strength Criterion of Frozen Saline Sandy Soil at High Pressures

Mechanical Modeling of Frozen Coarse‐Grained Materials Incorporating Microscale Investigation

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