Influence of Water Content on the Mechanical Parameters of the Intact Rock and Rock Mass

Vásárhelyi, Balázs; Davarpanah, Seyed Morteza

doi:10.3311/ppci.12173

Cited by 20 publications

(14 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The fact that in R-1 and R-2 the percentages of reduction of cpeak were found to be much greater than the percentages of reduction of ϕpeak suggests that the reduction of cohesion could be considered the controlling factor for the observed peak strength decreases in these stone types. This result would be in line with the theoretical analysis performed by Vásárhelyi and Davarpanah [75] who suggested that friction angle is an intrinsic parameter of the rock which is not influenced by the moisture content. The cpeak losses found in the three calcarenites could be attributed to physicochemical processes such as the…”

Section: Impact Of Water On Mohr-coulomb and Hoek-brown Shear Strength Parameterssupporting

confidence: 91%

Impact of water on peak and residual shear strength parameters and triaxial deformability of high-porosity building calcarenite stones: Interconnection with their physical and petrological characteristics

Rabat

Tomás

Cano

et al. 2020

Construction and Building Materials

View full text Add to dashboard Cite

Several studies have found that water can cause substantial reductions of mechanical properties of building stones such as unconfined compressive strength, tangent Young´s modulus or tensile strength. However, the influence of water content on shear strength parameters, triaxial compressive strength and modulus of elasticity under different confining pressures has been scarcely examined. For this reason, the present paper assesses the impact of water on peak and residual compressive strength and tangent Young´s modulus of three porous building geomaterials widely used in civil and architectural constructions under different confining pressure through triaxial compressive tests. Furthermore, the corresponding peak and residual shear strength parameters computed from Mohr-Coulomb (c and ϕ) and from Hoek-Brown (σci and mi) failure criteria are obtained under dry and saturated conditions. Complementary physical and petrological analyses are performed in order to understand the main causes of the effect of water observed in these rock materials. The results indicate that water causes significant reductions of peak and residual compressive strength and tangent Young´s modulus in the tested porous building stones for all the different applied confining pressures. Additionally, important changes of peak and residual shear strength parameters (c, ϕ, σci and mi) are exhibited by the studied stones when become saturated. This could be related to physicochemical changes such as the hydrolysis of quartz and silicates in crack tip region inducing subcritical crack growth (stress corrosion), the decrease of the cement quality and the deterioration of the intergranular bonds due to the dispersion or dissolution of some minerals (calcite or chlorite) and the formation of microcracks caused by the swelling of the clay minerals present in these materials when they come into contact with water.

show abstract

Section: Impact Of Water On Mohr-coulomb and Hoek-brown Shear Strength Parameterssupporting

confidence: 91%

Impact of water on peak and residual shear strength parameters and triaxial deformability of high-porosity building calcarenite stones: Interconnection with their physical and petrological characteristics

Rabat

Tomás

Cano

et al. 2020

Construction and Building Materials

View full text Add to dashboard Cite

show abstract

“…water content (see e.g. [18] or heating cycles [19], among the others. Recently, Vásárhelyi et al [20] analyzed the Hoek-Brown equation and suggested minor modification of it for Hungarian granitic rocks.…”

Section: Discussionmentioning

confidence: 99%

Estimation of the Poisson’s Rate of the Intact Rock in the Function of the Rigidity

Lógó

Vásárhelyi

2019

Period. Polytech. Civil Eng.

Self Cite

View full text Add to dashboard Cite

Although Poisson’s ratio is one of the basic rock mechanical parameters, it is less investigated than the other parameters. It can be assumed, that this material constant depends on the rigidity of the rock, among the others. The goal of this research is to find a theoretical relationship between the rigidity of the intact rock and Poisson’s ratio. It was assumed that there is a connection between the internal friction angle (or cohesion) and rigidity of the isotropic, linear elastic material, using the Mohr-Coulomb theory. Based on these equations from different published limit equilibrium, six different equations were compared. It is published that the rigidity value is equal (within the experimental error) to the Hoek-Brown material constant (mi) which value is well-known for many different rock types. Plotting the published Poisson’s ratio in the function of the rigidity of the intact rock the optimal connection was chosen.

show abstract

“…Notably, for a more precise and fundamental description of the mechanical behaviour of rock, one should apply non-equilibrium continuum thermodynamics along the lines of Asszonyi et al [23,25] and beyond. These relationships can be used for determining the mechanical parameters of the rock mass, as well [24,26].…”

Section: Relationship Between CImentioning

confidence: 99%

Complex analysis of uniaxial compressive tests of the Mórágy granitic rock formation (Hungary)

Davarpanah

Somodi²,

Kovács³

et al. 2019

Studia Geotechnica Et Mechanica

View full text Add to dashboard Cite

Understanding the quality of intact rock is one of the most important parts of any engineering projects in the field of rock mechanics. The expression of correlations between the engineering properties of intact rock has always been the scope of experimental research, driven by the need to depict the actual behaviour of rock and to calculate most accurately the design parameters. To determine the behaviour of intact rock, the value of important mechanical parameters such as Young’s modulus (E), Poisson’s ratio (ν) and the strength of rock (σcd) was calculated. Recently, for modelling the behaviour of intact rock, the crack initiation stress (σci) is another important parameter, together with the strain (σ). The ratio of Young’s modulus and the strength of rock is the modulus ratio (MR), which can be used for calculations. These parameters are extensively used in rock engineering when the deformation of different structural elements of underground storage, caverns, tunnels or mining opening must be computed. The objective of this paper is to investigate the relationship between these parameters for Hungarian granitic rock samples. To achieve this goal, the modulus ratio (MR = E/σc) of 50 granitic rocks collected from Bátaapáti radioactive waste repository was examined. Fifty high-precision uniaxial compressive tests were conducted on strong (σc >100 MPa) rock samples, exhibiting the wide range of elastic modulus (E = 57.425–88.937 GPa), uniaxial compressive strength (σc = 133.34–213.04 MPa) and Poisson’s ratio (ν = 0.18–0.32). The observed value (MR = 326–597) and mean value of MR = 439.4 are compared with the results of similar previous researches. Moreover, the statistical analysis for all studied rocks was performed and the relationshipbetween MR and other mechanical parameters such as maximum axial strain $\left( {{\varepsilon }_{\text{a,}\,\text{max}}} \right)$for studied rocks was discussed.

show abstract

Influence of Water Content on the Mechanical Parameters of the Intact Rock and Rock Mass

Cited by 20 publications

References 23 publications

Impact of water on peak and residual shear strength parameters and triaxial deformability of high-porosity building calcarenite stones: Interconnection with their physical and petrological characteristics

Impact of water on peak and residual shear strength parameters and triaxial deformability of high-porosity building calcarenite stones: Interconnection with their physical and petrological characteristics

Estimation of the Poisson’s Rate of the Intact Rock in the Function of the Rigidity

Complex analysis of uniaxial compressive tests of the Mórágy granitic rock formation (Hungary)

Contact Info

Product

Resources

About