Empirical methods to estimate the strength of jointed rock masses

Singh, Mahendra; Rao, K. Seshagiri

doi:10.1016/j.enggeo.2004.09.001

Cited by 168 publications

(52 citation statements)

References 7 publications

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“…Until this point, several researchers in rock mechanics and rock engineering have studied the relation between the unconfined compressive strength ratio σ cm / σ c and the deformation modulus ratio E rm /E r and found that these can be related approximately by the following equation (Ramamurthy [38]; Singh et al [40]; Singh and Rao [41], Galera et al [17]):…”

Section: Q Based Methodsmentioning

confidence: 99%

Empirical methods of calculating the mechanical parameters of the rock mass

Vásárhelyi

Kovács²

2016

Period. Polytech. Civil Eng.

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The knowledge of the main mechanical constants of a rock mass (such as strength, deformability and the Poisson's ratio) is one of the most important for rock engineering design on or in rock mass. Until now, several empirical relationships were determined for calculating these material constants based on both the quality of the studied rock mass (ie. RMR or GSI values) IntroductionLarge scale rock mass characterization introduces material parameters related to mechanical properties. The most important properties are the deformation modulus; the unconfined strength and the Poisson's ratio value of the rock mass in interest. These material parameters are frequently related to laboratory data characteristics of intact rock samples and to the classical rock mass classification systems (e.g. RQD, Q, RMR or GSI). These rock mass quality measures quantify the relation between the rock mass and the intact rock.The established empirical relations between the mechanical parameters of rock masses (unconfined compressive strength, deformation modulus) and the rock mass classification systems (RMR or GSI values) show exponential increasing deformation modulus and compressive strength with the increasing quality of the rock mass.The paper summarizes the observed correlations published between the mechanical properties of rock masses and one of the rock mass classification systems. It was found, that the deformation modulus and the strength of a rock mass data may reflect a simple exponential relationship of the observed quantities. According to analysis of different proposed equations a new formula is suggested and the modification ratio (i.e. ratio of the deformation modulus and the strength of rock mass) is also determined.However, it is important to note, that there are huge differences between the published date and the empirical formulas. The reason for this variance is the difference in situ testing methods, that may give different values of mechanical parameters even for the same rock mass. According to Bieniawski [1], even a single testing method, such as flat jack test, can lead to a widely scattering results even where the rock mass is very uniform. The other reason for the discrepancy in the different calculation methods is the directional effect. Most rock masses are anisotropic and do not have single deformation modulus [2].There is no mechanical (physical) interpretation of the above empirical equations but these were analysed by e.g. [3]. Recently, Ván and Vásárhelyi [4] suggested a damage mechanical approach to analyse them. In this paper their method will be also presented.

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Section: Q Based Methodsmentioning

confidence: 99%

Empirical methods of calculating the mechanical parameters of the rock mass

Vásárhelyi

Kovács²

2016

Period. Polytech. Civil Eng.

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“…It is possible to review estimation methods of bearing capacity under two main topics as analytical, empirical and experimental methods. Numerous researchers have established many equations regarding determination of ground bearing capacity with analytical and empirical methods [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16]. In analytical solutions, parameters of ground shear strength (cohesion "c" and angle of internal friction "") are deemed to be known.…”

Section: Estimation Methods Of Bearing Capacitymentioning

confidence: 99%

Evaluation of Ground Bearing Capacity Estimation Methods Based On Plate Loading Tests

Gül

Ceylanoğlu

2016

IOP Conf. Ser.: Earth Environ. Sci.

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Abstract. Within the scope of this study, bearing capacities were calculated based on eleven different estimation methods in literature, using some mass and material properties for different rock units (magnetite, syenite, serpentinite, limestone, clayey limestone and gypsum) encountered in three different open-pit mines (Sivas-Ulaş Open-Pit Celestite Mine, Divriği Open-Pit Iron Mine and Kangal Open-Pit Coal Mine) around Sivas in Turkey. Through regression analyses between estimated bearing capacity values and those that had been determined as a result of plate loading tests, bearing capacity estimation methods specified in the literature were assessed. Moreover, four different equations to be used in bearing capacity estimation were proposed.

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“…Singh and Seshagiri [18] used an empirical method to obtain a relationship between the ratio of rock to rock uniaxial compressive strength and the deformation modulus:…”

Section: Calibration Of Microparametersmentioning

confidence: 99%

Discrete Element Simulation of Roadway Stability in an Efflorescent Oxidation Zone

Zhao

Zhang

Peng

et al. 2018

Advances in Civil Engineering

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Due to crustal movement, coal-bearing strata weather and oxidise when exposed to the atmosphere and water. e unique geological characteristics of the rock in efflorescent oxidation zones lead to variations in lithology, weak rock, and large failures due to deformation. is paper analyses the variable physical mechanics and microstructural characteristics of efflorescentoxidised coal rock using the UDEC numerical simulation software. e software is used to study the gradual development, dynamic expansion, and deformation of cracks in the material surrounding efflorescent rock tunnels. ese numerical simulations reveal information concerning the evolution of surrounding rock attenuation, strength, and deformation. e destruction and causes of roadway failure were also analysed, and optimisation measures were proposed. e results from this study have applications for other research concerning roadway failure, deformation mechanisms, and the addition of appropriate supports.

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Empirical methods to estimate the strength of jointed rock masses

Cited by 168 publications

References 7 publications

Empirical methods of calculating the mechanical parameters of the rock mass

Empirical methods of calculating the mechanical parameters of the rock mass

Evaluation of Ground Bearing Capacity Estimation Methods Based On Plate Loading Tests

Discrete Element Simulation of Roadway Stability in an Efflorescent Oxidation Zone

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