Strength and deformation of tailings with fine-grained interlayers

Chen, Qinglin; Zhang, Chao; Yang, Chunhe; Ma, Changkun; Pan, Zhenkai; Daemen, J.J.K.

doi:10.1016/j.enggeo.2019.04.007

Cited by 23 publications

(4 citation statements)

References 51 publications

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“…The bulging deformation depresses with the confining pressure, which implies that the tailings will shrink failure after being sheared at a higher confining pressure because of the limitation of rotation and slip of tailings particles. This is consistent with previous research 25 .…”

Section: Resultssupporting

confidence: 94%

Influence of Clay Mineral Content on the Mechanical Properties and Microfabrics of Tailings

Zhang

Pan

et al. 2021

Preprint

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Clay mineral content has an important influence on the mechanical behavior of tailings, and the mechanical behavior of tailings directly affects the stability of tailings dams. XRF and XRD tests were carried out on tailings from three different regions. The chemical and mineral compositions of the tailings are analyzed. The strength and failure deformation of tailings were studied by carrying out laboratory triaxial compression tests. The effect of clay content on the stress path of tailings was investigated. The microfabric of tailings samples was examined with scanning electron microscopy (SEM) and nitrogen adsorption tests. The results show that the confining pressure corresponding to the samples exhibiting strain hardening increases with increasing clay mineral content in the tailings. The cohesion of tailings increases linearly, and the specific surface area decreases as the content of clay minerals increases. Nitrogen adsorption test results reveal from a microscopic point of view that changes in pore structure are associated with the content of clay minerals. The higher the content of clay minerals is, the higher the proportion of micropores (aggregated interior). Macroscopically, the overall porosity decreases and the fineness of the pores increases with clay content, which will directly affect the mechanical properties of tailings.

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Section: Resultssupporting

confidence: 94%

Influence of Clay Mineral Content on the Mechanical Properties and Microfabrics of Tailings

Zhang

Pan

et al. 2021

Preprint

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“…According to the equation ( 6 The strip-shaped p illar is characterized by the development of initial defects under external forces because of internal fissures, cementing materials, and other factors (Chen et al, 2019). Under the action of high stress, the stress of the pillar will exceed the ultimate yield strength of the material, and the pillar will change from elastic to plastic.…”

Section: Deformation Mechanism Of the General Modelmentioning

confidence: 99%

Archives of Mining Sciences

Chen¹,

Wu²,

Zhao³

2020

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STUDY ON THE MECHANICS AND MICRO/MACROECONOMICS OF MULTIPLE STRIP-SHAPED PILLAR RECOVERYThe structural system of a multiple strip-shaped pillar-roof is common in underground mine exploitation, and research on its mechanics and micro/macroeconomics is meaningful for utilizing strip--shaped pillar resources. A general model of the structural system of a multiple strip-shaped pillar-roof was established, the deformation mechanism of the model was analysed by material mechanics, and the deflection curve equations of the model were obtained. Based on the stress strain constitutive relation of the strip pillar and cusp catastrophe theory, the nonlinear dynamic instability mechanism of the structural system of a multiple strip-shaped pillar-roof was analysed, and the expressions of the pillar width for maintaining the stability of different types of structural systems were derived. The benefits of different structural systems were calculated using micro/macroeconomic theory, the type of the structural system was determined, and different recovery schemes were obtained. Theoretical application research was applied to a large manganese mine, and the results demonstrate that no pillar recovery was needed in 2016, a 9-m wide artificial pillar could be built to replace a pillar in 2017, and the construction of 14-m wide artificial pillars can be conducted in 2018.

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“…Han et al [20] conducted a comprehensive study on the engineering geological characteristics of the interlayer shear weak zones at the Baihetan Hydropower Station through geological surveys and laboratory experiments. Zhou et al [21] introduced a power function to fit the strain-time relationship in the creep process of muddy interlayers, and compared the traditional-isochronous curves to obtain long-term strength; Han et al [22] explored the creep characteristics of the interlayer mismatch zones through straight shear creep experiments; Tang et al [23] used the cyclic loading and unloading method to conduct uniaxial compression rheological tests on intact rocks and rock masses under cyclic loading and unloading conditions; Zuo et al [24] investigated the overall damage behavior of rock-coal-rock assemblages containing weak coal interlayers by uniaxial and triaxial compression tests; Chen et al [25] investigated the strength and deformation characteristics of tailings specimens containing fine-grained interlayers by undrained shear tests; Ren et al [26] used cement mortar, gypsum and other rock-like materials to simulate rocks and weak interlayers, and studied the anchorage mechanical properties of rock materials with weak interlayers through uniaxial compression tests; Miao et al [27] conducted straight shear-creep tests and ring shear tests on two remodeled specimens with different clay content to explore the effect of clay content on landslide evolution; Chen et al [28] investigated the shear rheological properties of natural weakly structured surfaces of rock bodies through indoor creep tests under different normal stress conditions; and Chen et al [29], based on the shear creep mechanics test of the interlayer dislocation zone of a high abutment slope rock mass, studied the interlayer dislocation zone shear creep mechanical properties and proposed a creep constitutive equation considering the accelerated creep process. In the construction of underground structures such as tunnel excavation, it is often necessary to consider the interaction between the tunnel lining structure and the surrounding soil [30,31].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Shear Creep and Long-Term Strength of Clay-Type Muddy Interlayer

Guo,

Zhang,

Liu

et al. 2023

Applied Sciences

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In order to have a better understanding of the shear creep characteristics of muddy interlayer in unstable landslides, we took the more “inferior” clay muddy interlayer as the research object, and shear creep experiments under different normal stress levels were carried out by means of hierarchical loading. This paper focuses on the variation law of creep curve and its long-term strength in the clay-type muddy interlayer under different normal stresses. The results showed that the creep characteristics of clay-type muddy interlayer were obvious: at the same normal stress level, instantaneous deformation, initial creep and stable creep appeared at lower shear stress level; at the level of rupture shear stress, there were two cases: the creep curve included three stages of typical initial creep, stable creep and accelerated creep failure, or directly entered the accelerated creep stage until the specimen’s failure. The average shear and stable creep rate of the muddy interlayer specimen increased exponentially with the increase in shear stress. The empirical formula u = u0 + A [1 − e(−Bt)] + Ctn of shear strength could better reflect the creep deformation law of muddy interlayer, and the correlation coefficient R2 varies from 0.90 to 0.99. Based on the definition of long-term ultimate strength, the long-term strength of clay-type muddy interlayer was determined.

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Strength and deformation of tailings with fine-grained interlayers

Cited by 23 publications

References 51 publications

Influence of Clay Mineral Content on the Mechanical Properties and Microfabrics of Tailings

Influence of Clay Mineral Content on the Mechanical Properties and Microfabrics of Tailings

Archives of Mining Sciences

Experimental Study on Shear Creep and Long-Term Strength of Clay-Type Muddy Interlayer

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