Advancements in rock block volume calculation by analytical method for geological engineering applications

Koulibaly, Aboubacar Sidiki; Shahbazi, Afsaneh; Saeidi, Ali; Rouleau, Alain; Quirion, Marco; Chesnaux, Romain

doi:10.1007/s12665-023-11027-6

Cited by 3 publications

(1 citation statement)

References 42 publications

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“…To gain insight into the cause, a block-size assessment was carried out using 3DEC as it is proven accurate and reliable means to estimate rock block volume (Koulibaly et al 2023), and the volumes of 68 blocks around Region 1 (Fig. 9b) were recorded.…”

Section: The Distribution and Failure Mode Of Failed Blocks Of The Tu...mentioning

confidence: 99%

3D Numerical Analysis for Failure and Deformation Assessment of the Waterway Tunnel, Wabe Hydropower Project, Central Ethiopia

Kassaw,

Regassa,

Raghuvanshi

et al. 2024

Preprint

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In designing suitable support systems and ensuring safe excavation of a tunnel, deformation and block failure assessment around the opening is a crucial aspect of tunneling. In this study, a distinct element modeling approach was employed to evaluate the distribution of failed blocks, failure modes, and displacements of the tunnels to gain insight into support recommendations for the Wabe Hydropower project in central Ethiopia. For this purpose, three representative numerical models were developed considering different rock mass along the tunnel alignment. Subsequently, the influence region classification technique was introduced and the models were systematically classified into three distinct regions. This technique enabled the consideration of blocky rock mass as discontinuum through the direct inclusion of field-measured joints with average spacings of 0.2, 0.56, and 1.2 m into a region surrounding the tunnel opening. The simulation results indicated that tunnels in closely jointed rock mass behave anisotropically, with failed blocks following the joint inclinations of N253/72 and N035/79 and exhibiting a tensile failure mode. Tunneling in the fault zone induced a shear failure mode, with a significant distribution of failed blocks aligned in the maximum principal stress direction. However, under low horizontal in-situ stress, both shear and tensile failure could exist, tensile failure affecting the roof and floor. Furthermore, tunnels in closely jointed rock mass are primarily influenced by horizontal displacement, whereas tunneling in fault zones led to both greater horizontal and vertical convergences, with horizontal displacement being more significant. Finally, the obtained results were used to propose support recommendations.

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Section: The Distribution and Failure Mode Of Failed Blocks Of The Tu...mentioning

confidence: 99%

3D Numerical Analysis for Failure and Deformation Assessment of the Waterway Tunnel, Wabe Hydropower Project, Central Ethiopia

Kassaw,

Regassa,

Raghuvanshi

et al. 2024

Preprint

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Block Volume and Shape: Comparison of Calculation Methods and Investigation of Possible Relationships

Taboni,

Ferrero,

Umili

2024

Rock Mech Rock Eng

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In dealing with rockfall risk mitigation, a proper assessment of the phenomenon is the key to correctly and precisely managing its possible consequences. In doing so, numerical simulations are an unavoidable step of the assessment process. The proper description of the slope and the falling rock is paramount. Thus, it is highly relevant to accurately assess block size and shape. Block size directly defines the kinetic energy involved in the phenomenon, whilst shape directly influences its trajectory. Tools to properly assess both block size and shape are available, either in analytical form or relying upon Discrete Fracture Network (DFN) models. However, at present, no concrete demonstration of the equivalence of these two methods is provided in the literature. Moreover, block size and shape are always treated separately, while it is likely that a relationship of some sort exists between the two as they derive from the same features of the rock mass (i.e., the 3D geometry of its discontinuities). This paper presents a comprehensive study concerning (1) the comparison between DFN and analytical approaches and (2) the existence and quantification of a shape–size correlation. A modeling campaign consisting of 20 different geometrical structures is performed with both methods, with the aim of obtaining In Situ Block Size Distributions and Shape Distributions. Although the DFN and the analytical approach have different advantages and disadvantages, they have proved to be comparable in terms of results. Both methods identify the existence of a correlation between shape and size of the blocks: the shape distribution changes with reference to block size. This result points out the importance of implementing shape distribution in rockfall numerical simulations. Finally, a suitable case study from the literature has been selected to test the applicability and usefulness of the new findings for the design of rockfall barriers.

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Bir Kaya Düşme Alanında LiDAR Sensörlü Akıllı Telefon Kullanarak Tekil Kaya Blok Hacimlerinin Belirlenmesi

Doğruluk,

Gültekin

2024

Jeoloji Mühendisliği Dergisi

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Bir kaya düşmesi bölgesinde düşen blokların hacminin belirlenmesi kaya düşmesi modelleme çalışmaları için önemli bir parametredir. Bu kapsamda yoğun bir araç trafiğinin bulunduğu Ankara Zir Vadisi yamaçlarından düşen 30 adet tüf-aglomera üyesi andezit bloğun hem şerit metre ile boyutları ölçülmüş, hem de lazer tarama özelliği bulunan bir akıllı telefon aracılığıyla fotogrametrik üç boyutlu (3B) modeli oluşturulmuştur. Böylece hem geleneksel, hem de fotogrametrik yöntemle toplanan veriler yardımıyla düşen blokların hacim hesapları gerçekleştirilmiş ve bu iki farklı yöntemle yapılan hesaplar karşılaştırılmıştır. Buna göre; geleneksel yöntemle belirlenen hacim değerleri ile fotogrametrik olarak belirlenen hacimler arasında istatiksel olarak yüksek bir ilişki bulunmaktadır. Arazide şerit metre ile yapılan ölçümler zaman kaybı oluşturmakta, sonuçlar ölçümü alan kişinin hassasiyetine bağlı olarak değişebilmektedir. Akıllı telefonlar ile tek bir ölçümle her bir blok ayırtlanabilmekte ve hacimleri ayrı ayrı hesaplanabilmektedir. Elde edilen bulgular, çalışmada kullanılan fotogrametrik yöntemi uygulama pratikliği açısından ön plana çıkarmaktadır.

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Advancements in rock block volume calculation by analytical method for geological engineering applications

Cited by 3 publications

References 42 publications

3D Numerical Analysis for Failure and Deformation Assessment of the Waterway Tunnel, Wabe Hydropower Project, Central Ethiopia

3D Numerical Analysis for Failure and Deformation Assessment of the Waterway Tunnel, Wabe Hydropower Project, Central Ethiopia

Block Volume and Shape: Comparison of Calculation Methods and Investigation of Possible Relationships

Bir Kaya Düşme Alanında LiDAR Sensörlü Akıllı Telefon Kullanarak Tekil Kaya Blok Hacimlerinin Belirlenmesi

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