Engineering Geological Characterisation of Block-in-Matrix Rocks

Nikolaidis, G.; Saroglou, Charalampos

doi:10.12681/bgsg.11793

Cited by 8 publications

(2 citation statements)

References 5 publications

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“…Based on these three simple classification methods of Bimrock, further refinements can be made. Nikolaidis and Saroglou [ 55 ] proposed a method based on six parameters (linear volume ratio of block bodies, strength of Bimrock, complexity of the matrix, complexity of Bimrock, classification of block bodies, and direction of block bodies) to characterize rock masses with bim structures, which can be directly assessed in the field. Napoli [ 56 ] considered rock type (water sensitivity), degree of anisotropy, internal disruption of complex formations, and block volume ratio (VBP) and proposed a more comprehensive classification method that allows for detailed classification based on laboratory mechanical tests and on-site photos.…”

Section: Definition and Classification Of Bimrockmentioning

confidence: 99%

Research Progress on the Geomechanical Properties of Block-in-Matrix Rocks

Guo,

Wei,

et al. 2024

Materials

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The differences in geomechanical properties and the uncertainty in the spatial distribution of Bimrock pose significant challenges to the construction and disaster prediction of geotechnical engineering. To clarify the geomechanical characteristics of Bimrock, this paper summarizes the basic concepts and classification methods of Bimrock at home and abroad. It discusses the methods and characteristics of determining the geometric features of Bimrock blocks and explores the influencing factors and laws of failure modes and strength under different stress states of Bimrock. The study finds that the failure mode of Bimrock is mainly influenced by factors such as block proportion, degree of welding between blocks and matrix, strength ratio between blocks and matrix, and geometric properties of blocks. Among these factors, block proportion is the most significant, and the degree of welding is a controlling factor. However, due to the complexity of Bimrock structures, there is a lack of applicable methods and mechanical models for the evaluation of geomechanical characteristics of Bimrock in engineering practice. This article also explores the influence and research methods of the geological characteristics of Bimrock in slope and tunnel engineering and, finally, provides prospects for the future research trends relating to Bimrock.

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Section: Definition and Classification Of Bimrockmentioning

confidence: 99%

Research Progress on the Geomechanical Properties of Block-in-Matrix Rocks

Guo,

Wei,

et al. 2024

Materials

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“…As a consequence, undisturbed sampling and laboratory specimen preparation are very challenging, as well as time-consuming and expensive, operations [26,31,34,[36][37][38][39][40][41]. This implies that it is rarely possible to obtain high-quality specimens for laboratory tests for the determination of their strength.…”

Section: Introductionmentioning

confidence: 99%

Preliminary Characterisation of an Italian Soft Rock with a Block-in-Matrix Fabric

et al. 2022

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Mélanges are heterogeneous geological deposits and represent the most widespread bimrock (block-in-matrix) formations. This paper presents the efforts undertaken to characterise an Italian mélange composed of a clayey-marly matrix enclosing strong calcareous blocks. Due to its low uniaxial compressive strength, this geomaterial can be classified as a soft rock. The weak nature of the marly matrix and its water sensitivity, as well as the presence of rock inclusions, made the collection and preparation of intact specimens extremely complex and time-consuming operations. The difficulties encountered during these phases are described in detail; the various non-conventional procedures considered and developed to overcome these problems are also presented. The potential of the solutions proposed lies in the fact that they can be conveniently applied to other soft rocks with a block-in-matrix internal arrangement, such as the Italian mélange. To characterise the Italian mélange, point load and uniaxial compressive tests were carried out. From the results of these tests, a conversion factor equal to 14 is proposed to correct the point load strength index in order to estimate the uniaxial compressive strength of soft rocks, such as the mélange under study. Moreover, to estimate local strains and the deformability of the geomaterial, the non-destructive digital image correlation technique was applied.

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