Large Scale Tests on Jointed and Bedded Rocks Under Multi-Stage Triaxial Compression and Direct Shear

Vergara, Maximiliano R.; Kudella, Peter; Triantafyllidis, Theodoros

doi:10.1007/s00603-013-0541-1

Cited by 25 publications

(8 citation statements)

References 2 publications

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“…6,7 The tests provided mechanical parameters, which were then used to analyze the deformation, strength, and failure characteristics of the rock. 8,9 Triaxial compression tests have been used to study the mechanical properties of various types of intact rock,…”

Section: Introductionmentioning

confidence: 99%

Study on mechanical properties and fracture modes of sandstone with cracks under triaxial compression

Liu

Wang³

2023

Engineering Reports

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This study examines the mechanical properties and fracture modes of sandstone with single and double cracks under varying confining pressures through triaxial compression tests. The stress–strain curves, mechanical parameters, and fracture modes of both intact and cracked sandstone are analyzed based on experimental results. The study finds that the presence of cracks has a significant impact on the mechanical properties of sandstone, with greater damage observed with an increase in the number of cracks. The peak strength and strain of a cracked rock sample increase with the increase in crack angle. The fracture mode of sandstone is influenced by both crack angle and confining pressure. When the crack angle is small, the fracture mode is a combination of shear and tensile failure, while a large crack angle results in shear failure. Moreover, as the confining pressure increases, the degree of damage to the sandstone also increases.

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Section: Introductionmentioning

confidence: 99%

Study on mechanical properties and fracture modes of sandstone with cracks under triaxial compression

Liu

Wang³

2023

Engineering Reports

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“…However, research on the constitutive theory of laminated surrounding rock masses in tunnels is fairly limited and cannot provide the theoretical guidance for the engineering design of actual tunnels. In terms of the mechanisms of laminated rock mass deformation, previous studies have mainly investigated patterns of stability [7], deformation [8][9][10], mechanical behavior [11], and mechanical properties [12]. The main triggers for large tunnel deformation through highlydipped laminated soft rock under high in situ stress are high structural stress, unfavorable rock occurrences, and low rock strength [13].…”

Section: Introductionmentioning

confidence: 99%

Hoek-Brown Failure Criterion-Based Creep Constitutive Model and BP Neural Network Parameter Inversion for Soft Surrounding Rock Mass of Tunnels

Chen

et al. 2021

Applied Sciences

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This paper summarizes the main factors affecting the large deformation of soft rock tunnels, including the lithology combination, weathering effect, and underground water status, by reviewing the typical cases of largely-deformed soft rock tunnels. The engineering geological properties of the rock mass were quantified using the rock mass block index (RBI) and the absolute weathering index (AWI) to calculate the geological strength index (GSI). Then, the long-term strength σr and the elastic modulus E0 of the rock mass were calculated according to the Hoek–Brown failure criterion and substituted into the creep constitutive model based on the Nashihara model. Finally, the creep parameters of the surrounding rock mass of the Ganbao tunnel were inverted and validated by integrating the on-site monitoring and BP neural network. The inversion results were consistent with the measured convergence during monitoring and satisfied the engineering requirements of accuracy. The method proposed in this paper can be used to invert the geological parameters of the surrounding rock mass for a certain point, which can provide important mechanical parameters for the design and construction of tunnels, and ensure the stability of the surrounding rock mass during the period of construction and the safety of the lining structure during operation.

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“…В исследовании образцов аргиллита в натурных условиях в нижней части скважины [22] сообщается о том, что из-за накопления образцами поврежденности в процессе многоступенчатого испытания прочность породы может быть существенно недооценена. В работе [23] авторами приводятся интересные исследования, выполненные с помощью многоступенчатых экспериментов на образцах больших размеров: высота 120 см, диаметр 60 см. Образцы представлены слоями аргиллита и песчаника, аргиллита и известняка.…”

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“…Образцы представлены слоями аргиллита и песчаника, аргиллита и известняка. Авторы [23] указывают на пластичное поведение породы как необходимое условие, позволяющее определить предел прочности образца при многоступенчатом нагружении, не доводя образец до разрушения. В работе [14] авторами показана возможность применения многоступенчатого метода не только к горным породам, но и к нетрадиционным гранулированным материалам.…”

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Salt Rock Deformation under Bulk Multiple-Stage Loading

Pankov¹,

Морозов²

2019

PMI

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Представлено экспериментальное обоснование возможности применения метода объемного многоступенчатого нагружения для исследования процесса деформирования соляных пород в лабораторных условиях. Приведены результаты сопоставительных исследований объемного многоступенчатого и одноступенчатого нагружения образцов соляных пород. Представлены результаты исследования влияния уровня бокового давления на значения предела прочности и предела остаточной прочности сильвинита, определенные одноступенчатым и многоступенчатым методами. Представлены результаты исследования влияния уровня бокового давления на предел дилатансии каменной соли. Проанализировано влияния метода нагружения на значения параметров паспорта прочности Кулона -Мора сильвинита. Проанализировано изменение модуля упругости в процессе деформирования соляных пород в зависимости от уровня бокового давления.Показано, что метод многоступенчатого нагружения адекватно отражает процессы деформирования и разрушения соляных пород и позволяет не только уменьшить влияние неоднородностей внутреннего строения образцов на результаты экспериментальных данных, но также существенно снизить необходимый объем породного материала.

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Large Scale Tests on Jointed and Bedded Rocks Under Multi-Stage Triaxial Compression and Direct Shear

Cited by 25 publications

References 2 publications

Study on mechanical properties and fracture modes of sandstone with cracks under triaxial compression

Study on mechanical properties and fracture modes of sandstone with cracks under triaxial compression

Hoek-Brown Failure Criterion-Based Creep Constitutive Model and BP Neural Network Parameter Inversion for Soft Surrounding Rock Mass of Tunnels

Salt Rock Deformation under Bulk Multiple-Stage Loading

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