A Multivariate Technique for Evaluating the Statistical Homogeneity of Jointed Rock Masses

Li, Yanyan; Wang, Qing; Chen, Jianping; Song, Shengyuan; Ruan, Yunkai; Zhang, Qi

doi:10.1007/s00603-014-0678-6

Cited by 18 publications

(4 citation statements)

References 34 publications

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“…Because of the enumerated limitations and that orientation is the only fracture parameter that Miller (1983) used, several researchers have proposed variants of his method. These variants involved other equal area subdivision patches of the stereonet (QuocPhi et al 2012;Song et al 2015), other fracture parameters (Li et al, 2015;Song et al, 2015Song et al, , 2018; Zhang et al, 2016;Zhou et al, 2018), or other statistical tests (Martin and Tannant 2004;Li et al 2014aLi et al , 2015Song et al 2015Song et al , 2018. In the literature, it was noted that Miller's test and its variants were mainly used in engineering studies, which did not exceed a few square kilometers.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

A cluster-based multiparametric similarity test for the compartmentalization of crystalline rocks into structural domains

Abi

Walter

Saeidi

et al. 2022

QJEGH

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Usually, fracture sampling studies comprise the collection of several fracture samples, which involve many fracture clusters. Grouping fracture samples into structural domains is generally useful for geologists, hydrogeologists, and geomechanicians as a region of fractured rocks is subdivided into sub-regions with similar behavior in terms of their hydromechanical properties. One of the common methods used for grouping fracture samples into structural domains considers the fracture orientation of clusters and ignores several fracture parameters, such as fracture spacing, aperture, and persistence, which are important for fluid circulation in the rock mass.In this study, we proposed a new cluster-based similarity method that considered the orientation of clusters as well as clusters’ aperture, persistence, and fracture spacing. Field investigations were conducted in the Grenville geological province of the Canadian Shield in the Lanaudière region, Quebec, Canada, where fractures were sampled from 30 outcrops and four boreholes. The proposed method is more suitable than other methods, and has applications in hydrogeology, rock mechanics, and especially in studies of fluid circulation in the rock mass. In addition, a method for the compartmentalization of a given study area into structural domains by means of Voronoi diagrams was also proposed.

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Section: Accepted Manuscriptmentioning

confidence: 99%

A cluster-based multiparametric similarity test for the compartmentalization of crystalline rocks into structural domains

Abi

Walter

Saeidi

et al. 2022

QJEGH

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“…Underground caverns, tunnels and tunnels are often excavated in layers, and the size of the excavation unload affects the stability of the rockwork. Therefore, it is necessary to study the effect of unloading amount on rock creep under the unloading stress path (Li, 2000;Li et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

Research on creep characteristics of loading and unloading of hard Flint limestone

et al. 2023

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The hard Flint limestone of Shuibuya hydropower station underground construction cavern is utilized as a research object to investigate the creep problem caused by excavation of rock masses such as caverns. In order to perform a triaxial compression grade-unloading creep test, the actual adjustment path of stress during excavation of underground cavern surrounding rock is used. Limestone under different confistiff pressures is then evaluated. Based on the Nishihara model, the elastic damage element considering time-dependent damage is introduced, and the unloading creep constitutive model of stiff Flint limestone is established and verified by experiments. The results show: 1) Deformation and creep strain appear at all stress levels. 2) As the unloading amount increased from 2 to 4 MPa, the quasi-destructive stresses of the samples were smaller from 83 to 79 MPa, indicating that the unloading amount affected the final creep damage strength of the rock samples. In other words, the higher the unloading amount, the lower the ultimate creep failure strength. 3) When entering the accelerated creep stage, the axial and lateral creep strains of the sample increase non-linearly, and the rupture duration of the sample is very short. Therefore, the creep deformation and creep rate characteristics of this stage should be paid attention to in practical engineering. 4) Different from the loading stress path, the failure mode of the Flint limestone rock sample is different. When the unloading amount is 2 and 4 MPa, the creep failure mode of the Flint limestone rock sample is shear failure, showing a significant oblique section crack. 5) The non-linear creep model curve of aging damage and the fitting effect of the unloading creep test curve are acceptable. The rationality of the established non-linear creep model is illustrated.

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“…Criteria for judging the stability of an NBA in soil formations are still required. A problem similar to the arch stability is the surrounding rock stability, whose representative criteria are the safety factor criterion based on the strength reduction method [24][25][26], displacement criterion based on theoretical derivation [26,27], empirical criteria based on field monitoring and numerical simulation [28,29], reliability criteria based on probability theory [30], and other comprehensive evaluation methods [31][32][33]. The selfstabilization span and time of an underground cave obtained on the basis of various rock mass quality classification standards [34,35] are derived from engineering experience.…”

Section: Introductionmentioning

confidence: 99%

Revisiting Protodyakonov’s Pressure Arch Theory

Zhu,

Zhou,

Zhang

et al. 2023

Advances in Transdisciplinary Engineering

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Protodyakonov’s pressure arch theory (PPAT) has been widely used in rock engineering design owing to its conciseness and clear engineering concept. However, the applicability of this theory to soil formations has not yet reached a consensus, mainly because of the lack of criterion for stable arching in soil and the fact that soil has a much lower strength than rocks. To fill this gap, the PPAT based on arch assumptions and arch stability requirements is revisited in this paper. A modified arch equation (M-PPAT) is established considering the lateral stress and arch foot resistance. Expressions for the arch strength and arch foot stability criteria are given. A trapdoor test and PFC2D simulation is conducted to verify the M-PPAT. The difference between the arch height calculated by M-PPAT and the trapdoor test result is only 3.3%, which is much better than the height given by PPAT. The particle flow simulation results for the trapdoor test by PFC2D show that the particle material can form a stable naturally balanced arch (NBA), and the shape of the arch is very close to the test results. Taking typical rock and soil formations as examples, the inferences obtained by M-PPAT are discussed. The arch foot stability criterion was used to test the stability of the arches formed in the soil using the arch axis equation, which does not consider the arch foot stability, and it was found that these arches are unstable except for M-PPAT. The arch height of stable NBA is limited by the arch foot stability criterion, and the maximum buried depth for stable NBA was found to be limited by the arch strength criterion. Since M-PPAT does not consider cohesion, this theory should be used with caution in cohesive soil formations. The research results can be used to determine the applicable scope of the surrounding earth pressure calculation method that is based on the PPAT. Moreover, they have reference value for designing underground space structures.

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A Multivariate Technique for Evaluating the Statistical Homogeneity of Jointed Rock Masses

Cited by 18 publications

References 34 publications

A cluster-based multiparametric similarity test for the compartmentalization of crystalline rocks into structural domains

A cluster-based multiparametric similarity test for the compartmentalization of crystalline rocks into structural domains

Research on creep characteristics of loading and unloading of hard Flint limestone

Revisiting Protodyakonov’s Pressure Arch Theory

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