New accelerated rock creep model considering
2024年3月1日 Accelerated creep models are popular research topics in rock mechanics. By analyzing the variation in the viscosity coefficient in the accelerated creep stage and
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A novel creep contact model for rock and its implement in
2024年3月1日 The creep behavior of rocks significantly impacts projects' structural safety, including mining, tunneling, and hydraulic engineering. Numerous creep models used in
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Uncovering the creep deformation mechanism of rock-forming
2022年3月1日 Time-dependent deformation (i.e., creep) occurs when rocks are subjected to a constant load (below their short-term failure strength) for a long time and the creep
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Creep damage model of rock with varying-parameter
2023年12月4日 Rock creep is closely related to rock and soil deformation and long-term stability1. In the development process of slope excavation and tunnel excavation, the
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The creep model based on nonlinear Newton body under
2023年3月24日 The results show that the newly established model can describe the characteristics of the rock in the decay creep stage and the constant creep stage,
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Creep characteristics and prediction of creep failure of rock ...
2020年3月12日 Shear creep is one of the most important mechanical behaviors of rock discontinuities. The creep mechanism and prediction of starting point of the accelerating
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Long-term creep and microscopic deformation ... - Oxford
2022年4月30日 Long-term creep and microscopic deformation mechanisms of sandstone using rock rheology creep equipment and scanning through high-resolution 3D XRM
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A modified creep model for rock considering hardening and
2023年7月25日 Abstract. Rock creep is the result of the combined effects of many environmental conditions, such as temperature and moisture, and internal hardening and
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Experimental study on uniaxial creep characteristics of
2023年12月4日 The creep characteristics of the perimeter rocks are of great theoretical and practical value. Firstly, the triaxial pre‐peak loading and unloading tests on the
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Modeling of the creep and nonlinear damage effects of
2024年2月9日 Many of these models require several curve-fitting parameters that lack physical significance. This paper aims to put forward a nonlinear damage creep model
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A novel time-dependent damage constitutive model for
2023年9月20日 Time-dependent damage models use a progressive damage variable to efectively represent the gradual growth and propagation of microcracks in rocks. These models successfully reproduce the primary, second-ary, and tertiary creep deformation stages of hard rocks (Cheng 2022; Cheng et al. 2022; Zhao et al. 2016).
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CONCASSEUR Roc Impact et Matériel pour mines
Matériel de mines et carrières Concassage, Broyage, Criblage, Installation complète clé en main. La société française ROC IMPACT, implantée en Europe et sur le continent Africain, fabrique et installe du matériel de
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Energy-Based Fatigue–Creep Damage and Failure Pattern of Rock
2023年12月20日 It is not uncommon that the rock–backfill composite structure (RBCS) material in underground mine stopes being exposed to alternative fatigue and creep loading condition. Understanding the failure and energy evolution is critical to maintain the backfilled stope stability and ensure safe mining activities. This work aims to investigate the effect
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Experimental study on the creep behaviour of rock-filled
2018年10月20日 Both the creep strain and shrinkage strain of RFC were less than those of SCC. The rock framework in the RFC significantly influenced its creep behaviour, and the creep ratio of RFC was related to the volumetric fraction of SCC. Furthermore, the creep models CEB-FIP and AIC209 were used to analyse the creep behaviour of RFC and SCC.
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Equivalent creep surface of Drucker‐Prager criterion
Download scientific diagram Equivalent creep surface of Drucker‐Prager criterion from publication: A nonlinear elasto‐viscoplastic model for clayed rock and its application to stability ...
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Viscoelasticity-induced fracture behavior of rock-concrete
2023年2月1日 To investigate viscoelasticity-induced fracture behaviors of rock-concrete interface, creep tests were conducted on the composite rock-concrete specimens with two interface roughness degrees, i.e. 4 × 4 and 7 × 7 interfaces, under two sustained load levels of 50%P max and 75%P max. After the 90-day sustained loading, the creep specimens
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Comment choisir un concasseur de roche - 6 conseils pour le
4 天之前 Si des problèmes surviennent, arrêtez immédiatement le concasseur de roches et résolvez le problème. Nourrir progressivement. Alimentez progressivement le matériau dans le concasseur pour assurer un débit constant et contrôlé. Évitez de surcharger le concasseur, car cela peut entraîner des inefficacités et des dommages potentiels.
Consulter un spécialisteStudy on very long-term creep tests and nonlinear creep
2021年10月1日 A reasonable explanation of the time-dependent deformation behavior of salt rock is essential for reliable model calculations and optimal design of salt caverns. 4 The uniaxial creep test results for 21000 h (875 days) under different axial stresses are shown in Fig. 3, including axial and lateral creep strain.Salt rock has obvious time-dependent
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Creep constitutive model considering nonlinear creep
2024年1月1日 Fractured rock creep constitutive model. An often-used component model in geological engineering is the classical Nishihara model, which is consisted of three parts: the Hooke element (H), the viscoelastic body (N/H) and the viscoplastic body (N/St.V) [16], as presented in Fig. 6a.
Consulter un spécialisteConcasseur à cône Sandvik CH660 pour les applications de
Max. feed size. 321.0 mm (12.6 in.) Motor power. 315 kW (422 hp) Le Sandvik CH660 offre une conception avancée avec un faible encombrement et une capacité élevée par rapport à sa taille. Ce concasseur à cône est doté d'un arbre principal avec système hydraulique soutenu aux deux extrémités.
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Time-dependent cracking and brittle creep in crustal rocks: A
2013年7月1日 In Fig. 8 b, we observe some differences in the normalised stress required to achieve a given creep strain rate for different rock types. In particular, the rocks for which we see the greatest differences are Tavel limestone (a micritic limestone with a porosity of about 10%) and Crab Orchard sandstone (a quartz-rich, highly cemented, sandstone ...
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The Phenomenon and Examples of Rock Creep - ScienceDirect
1993年1月1日 Rock creep tests, in a more usual time interval, have been described elsewhere and the whole phenomenon of creep has basically been covered in the formulae (e.g. Volume 3, Chapter 6). With in situ rock, however, long-term creep under small stress should be considered. In this chapter are described three long-term experiments,
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What is Creep - Material Creep - Definition Material
Creep, known also as cold flow, is the permanent deformation that increases with time under constant load or stress. It results due to long time exposure to large external mechanical stress with in limit of yielding and is more severe in material that are subjected to heat for long time. The rate of deformation is a function of the material’s ...
Consulter un spécialisteExperimental Study on the Influence of Temperature on Rock Salt Creep ...
2023年2月1日 Constructing salt cavern gas storage in the ultra-deep strata more than 2000 m in depth is an important strategic technologic development in China. A primary issue is that higher temperature affects the creep behaviors of the surrounding rock. In this paper, triaxial creep tests of rock salt under multi-stage temperatures were carried out to study
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Concasseur à mâchoires ROC - ROC IMPACT
Les concasseurs à mâchoires Roc Impact, utilisés à travers le monde dans de nombreuses mines et carrières, sont réputés pour être fiables et robustes. Le type ROC dispose de larges ouvertures d’alimentation et de longues mâchoires ainsi que d’une grande course de concassage. Il est principalement destiné au concassage primaire de ...
Consulter un spécialisteCoupled analytical solutions for circular tunnels considering rock ...
2023年4月1日 We derive theoretical solutions for rock creep displacement caused by excavation and for the anchoring forces of the prestressed bolts, and verify the solutions using a numerical simulation and an engineering example. First, based on the coordinated deformation between the prestressed bolts and the creeping rock mass, we establish a
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rock concasseur creep
feldspath broyeur concasseur plantes ; utilisés de production de mono éthylène glycol en France ; equipement de broyage en pdf ; Raymond Mill Fabricant En Allemagne rahang ; prix des cendres volantes en Inde Uttar Pradesh ; organigramme de lusine de traitement dor ; broyeur à boulets et rodmill conception ; ciment clyncer moulin de meulage
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Uncovering the creep deformation mechanism of rock-forming
2022年3月1日 Creep is a process where deformation increases under constant stress and generally, the laboratory creep tests of rocks have three stages, namely, primary (transient) stage, secondary (steady-state) stage and tertiary (accelerated) stage [2].Nevertheless, the tertiary creep phase may not exist at low temperature, low stress and low pore-water
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