Estimation of limestone rock mass deformation modulus using empirical equations

Ajalloeian, Rassoul; Mohammadi, Mojtaba

doi:10.1007/s10064-013-0530-3

Cited by 36 publications

(8 citation statements)

References 15 publications

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“…Hoek-Brown criterion since it was first put forth [30]. When estimation approach of m and s values were developed from the RMR by Bieniawski to the GSI by Hoek and Brown [31], the application range of the Hoek-Brown criterion was accordingly enlarged from hard rock mass to the rock mass of poor quality. e Hoek-Brown criterion is formulized as [29,32,33]:…”

Section: Proposed Methods Many Improvements Have Been Made Tomentioning

confidence: 99%

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A Method for Determining the Mechanical Parameters of Solution Pore and Crevice Limestone Based on Porosity

Wen

Zheng

et al. 2021

Advances in Civil Engineering

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Limestone stratum has great anisotropy, which is distributed from large karst caves, pipelines, and faults to small solution pores, and crevices. In this paper, uniaxial compression tests of solution pore and crevice limestones from Mamaya I hydropower station and Ronglai hydropower station are conducted, and the porosity of these limestones is measured. The results show that there is a good power function relationship between compressive strength and the porosity of the solution pore and crevice limestone. Based on the Hoek–Brown criterion, the method for determining mechanical parameters of the solution pore and crevice limestones is proposed, taking the porosity of the rock into consideration. Then, the relationships between the rock mass parameters m b , s, and a and the porosity n are deduced. Based on the proposed method, the variation laws of the mechanical parameters of the limestones, including uniaxial compressive strength (UCS), tensile strength, deformation modulus, shear strength parameters are analyzed. The proposed method simplifies the complexity of mechanical parameters selection by quantifying GSI, avoids the subjectivity and uncertainty, and has good reliability and suitability in the pore and crevice limestone stratum, which has a certain guiding significance for the construction of similar sites.

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Section: Proposed Methods Many Improvements Have Been Made Tomentioning

confidence: 99%

“…As with the procedure [34], excavation degradation factor (represented as D e in formulas) is introduced, which yields the deformation modulus as follows [31,35]:…”

Section: Degradation Of Deformation Modulusmentioning

confidence: 99%

A Method for Determining the Mechanical Parameters of Solution Pore and Crevice Limestone Based on Porosity

Wen

Zheng

et al. 2021

Advances in Civil Engineering

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“…Hence, it is required to calibrate the mechanical properties of macroscopic rock mass. Researchers reported many rock mass classification systems to evaluate and correct the properties of rock mass, such as RQD [34], GSI [35,36], and RMR [37]. In this study, the GSI method was adopted, which evaluates rock mass properties mainly with respect to the observed rock mass structural characteristics and the appearance of discontinuities.…”

Section: Rock Mass Propertiesmentioning

confidence: 99%

A Case Study on Large Deformation Failure Mechanism and Control Techniques for Soft Rock Roadways in Tectonic Stress Areas

Xue

Fang

et al. 2019

Sustainability

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Large deformation and failure of soft rock are pressing problems in the mining practice. This paper provides a case study on failure mechanisms and support approaches for a water-rich soft rock roadway in tectonic stress areas of the Wangzhuang coal mine, China. Mechanic properties of rock mass related to the roadway are calibrated via a geological strength index method (GSI), based on which a corresponding numerical simulation model is established in the Universal Discrete Element Code (UDEC) software. The failure mechanism of the roadway under water-saturating and weathering conditions is revealed by field tests and numerical simulation. It is found that the stress evolution and crack development are affected by weathering and horizontal tectonic stresses. The roadway roof and floor suffer from high stress concentration and continuous cracking, and are consequently seen with rock failure, strength weakening, and pressure relief. Unfortunately, the current support system fails to restrain rock weathering and strength weakening, and the roadway is found with serious floor heave, roof subsidence, and large asymmetric deformation. Accordingly, a new combined support system of “bolt–cable–mesh–shotcrete + grouting” is proposed. Moreover, numerical simulation and field testing are conducted to validate the feasibility and effectiveness of the proposed approach, the results of which demonstrate the capacity of the proposed new support method to perfectly control the surrounding rock. Findings of this research can provide valuable references for support engineering in the soft rock roadway under analogous geological conditions.

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“…Empirical estimation is performed using a variety of methods, most of which establish a correlation between various rock mass classifications or a single geological index and the deformation modulus [1][2][3][4][5][6][7][8][9][10][11][12][13]. These correlations are useful for practical applications.…”

Section: Introductionmentioning

confidence: 99%

New Method to Estimate Rock Mass Deformation Modulus Based on BQ System

Xue,

Song,

Feng

et al. 2024

Applied Sciences

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The rock mass deformation modulus is one of the most important design parameters in a range of rock engineering applications. Its value is usually obtained directly through in situ testing or estimated indirectly on the basis of a rock mass quality classification system. Because in situ testing is generally costly, time-consuming, and presents operational difficulties, it cannot be carried out extensively, and many researchers have concentrated on developing indirect procedures to obtain information on the modulus of deformation, such as the RMR method, Q method, and GSI method. The purpose of this paper is to present a new system for estimating the rock mass deformation modulus called the BQ method, which is based on the BQ (basic quality) system. In this paper, the BQ system is first briefly reviewed, and then more than 60 in situ measurements from three large hydropower stations in China are used to develop a new relationship between BQ and the deformation modulus, based on a power function relationship. The paper also derives correlations based on the existing estimation formula and the relationship between BQ and other classification schemes, resulting in several recommended formulas for estimating the deformation modulus of a rock mass using the BQ method.

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Estimation of limestone rock mass deformation modulus using empirical equations

Cited by 36 publications

References 15 publications

A Method for Determining the Mechanical Parameters of Solution Pore and Crevice Limestone Based on Porosity

A Method for Determining the Mechanical Parameters of Solution Pore and Crevice Limestone Based on Porosity

A Case Study on Large Deformation Failure Mechanism and Control Techniques for Soft Rock Roadways in Tectonic Stress Areas

New Method to Estimate Rock Mass Deformation Modulus Based on BQ System

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