The Effect of Density and Porosity on the Correlation Between Uniaxial Compressive Strength and P-wave Velocity

Jamshidi, Amin; Zamanian, Hasan; Sahamieh, Reza Zarei

doi:10.1007/s00603-017-1379-8

Cited by 68 publications

(16 citation statements)

References 27 publications

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“…Jamshidi et al [28] are the only authors, to our knowledge, who obtained a correlation between UCS and v p only for limestone. The authors reported cylindrical specimens 54 mm in diameter and 135 mm in height, with an average v p value of 4.828 km•s −1 .…”

Section: Introductionmentioning

confidence: 75%

“…Beginning from v p and v s , the dynamic elastic modulus (E dyn ) and dynamic Poisson's ratio (ν dyn ) can be obtained [33], but these velocities are related to more physical and mechanical properties of rocks. In this sense, a good number of authors have studied the relationship between v p and density (ρ) [7][8][9], porosity (n) [10][11][12], pore water content [13][14][15][16], content on clayey minerals inside the pores [17,18], UCS with different degrees of saturation (S r ) [19][20][21][22][23][24][25][26][27][28], and the static elastic modulus (E st ) [29,30]. In addition, the relationship of the geometry of the tested specimen with v p has been studied, both on the diameter (D) [31] and height (H) [32] of the specimen.…”

Section: Introductionmentioning

confidence: 99%

“…Table 2 shows the equations obtained by authors who addressed correlations not only with v p , but also with other parameters. In this sense, Jamshidi et al [28] considered the combined effect of v p , ρ, and n, and Karakul and Ulusay [18] considered v p , S r , and the effective clay content (ECC). The aim of this study was to statistically analyze the combined effect of v p , ρ, and n on the UCS of cylindrical specimens of saturated limestone.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Analytical Model for Predicting the UCS from P-Wave Velocity, Density, and Porosity on Saturated Limestone

2019

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Rock mechanics and rock engineering projects require determining, among other parameters, the uniaxial compressive strength (UCS) of rock. For such a purpose, it is not uncommon to perform ultrasonic pulse laboratory tests. Many researchers have found experimental relationships between strength and P-wave velocity, but these relationships are based mainly on dry conditions and without considering any other physical or chemical characteristics of the studied rock. Specifically, for limestone, there are 11 correlations reported in the literature, eight of which are simple and the remaining three are multiple, and, among the latter, only two of them consider the saturation. In order to evaluate the combined effect of P-wave velocity, density, and porosity on the UCS of saturated limestone, simple and multiple regression analyses were carried out on the test results of 13 saturated limestone specimens to determine the parameters of both previously mentioned predictive models. The results showed that density is not correlated with strength.

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Section: Introductionmentioning

confidence: 75%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Analytical Model for Predicting the UCS from P-Wave Velocity, Density, and Porosity on Saturated Limestone

2019

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“…In the same rock sample, the more the rock pores, the smaller the UCS. The effect of the pores on the uniaxial compressive strength is greater than the Young's modulus [41,42]. According to Table 3, when the ENI concentration was 0%, the fractal dimension was 1.35.…”

Section: Fractal Dimensionmentioning

confidence: 97%

Study on the Mechanism of Ionic Stabilizers on Shale Gas Reservoir Mechanics in Northwestern Hunan

et al. 2019

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The shale of the lower Cambrian Niutitang formation in northwestern Hunan is an ideal reservoir for shale gas. There is a close connection between borehole stability and drilling fluid in shale gas drilling. Ionic stabilizer is a new type of stratum consolidation agent that inhibits the hydration expansion of clay minerals and improves mechanical strength of the borehole. The traditional idea of pore wall protection is to use drilling fluid additives to prevent shale from interacting with water. However, ionic stabilizer can change the hydrophilic of clay minerals in shale, making the particles become hydrophobic and dense, therefore, the formation stability can be enhanced simultaneously. The material used in this paper is different from the normal ionic stabilizer, some chemical bonds that have been changed in the new material called enhanced normality ionic (ENI) stabilizer. This paper utilized the shale samples those obtained from Niutitang formation to study the connection between ENI and the mechanical properties of shale. Mechanical tests and microscopic pore tests were performed on different samples which were soaked in water and the ENI with different concentrations. It has been found through tests that ENI can inhibit the development of shale pores, and as the concentration increases, the inhibition increases. In addition, as the ENI concentration increases, the uniaxial compressive strength and Young’s modulus of the shale increase, and the ratio of stability coefficients decreases. It can be concluded that the ENI can improve the mechanical strength of carbon shale, and prevent the development of rock damage. Moreover, it can improve the ability of rock to resist damage, and enhance borehole stability initiatively.

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“…P-wave velocity is a non-destructive technique that is used to characterise the jointed rock mass encountered in the field. Though several correlations are available for assessing the strength and modulus of intact or jointed rocks from observed P-wave velocity (Entwisle et al 2005;Diamantis et al 2011;Sarkar et al 2012;Karakus and Akatay 2013;Kurtulus et al 2016;Shen et al 2017;Jamshidi et al 2018), there are few studies which have focused on the influence of rock joints and their attributes on the seismic wave propagation (Pyrak-Nolte et al 1990;Boadu and Long 1996;Wu et al 1998;Zhao and Cai 2001;Zhao et al 2006a, b;Li et al 2010;Zhu et al 2011a, b;Zhu et al 2012a, b;Zhu and Zhao 2013;Li 2013;Fan and Sun 2015). These studies do corroborate the fact that Vp gets affected by the attributes of joints in rocks.…”

Section: Introductionmentioning

confidence: 99%

Prediction of Strength and Modulus of Jointed Rocks Using P-wave Velocity

Singh¹,

Khalkho²

2021

Preprint

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Strength and deformation characteristics of jointed rocks are important parameters for the design of many civil and mining engineering structures. These parameters are difficult to obtain from direct testing of jointed rocks, hence it is usual practice to derive them through indirect approaches. In the present study, an attempt has been made to obtain rough estimates of strength and modulus of jointed rocks through P wave velocity. Jointed specimens of a model rock were prepared for laboratory testing. Joints at different orientations and comprising of different joint roughness coefficients were used (JRC=2-4, 12-14 and 18-20). Ultrasonic P-wave velocity and UCS tests were conducted on the specimens. The effect of joint orientation and joint wall roughness on P-wave velocity was studied. An index, Joint Factor was used to quantify the effect of joint attributes on strength and modulus of jointed rock. It was observed that P-wave velocity is closely linked with Joint Factor. This study suggests a correlation to obtain Joint Factor Jf from P-wave velocity. It is recommended that this correlation may be used in the field to assess the Jf. The computed Jf may then be used to get the strength and modulus values of jointed rocks in the field. Charts are also suggested to roughly assess the shear strength parameters c and ϕ of the jointed rock.

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The Effect of Density and Porosity on the Correlation Between Uniaxial Compressive Strength and P-wave Velocity

Cited by 68 publications

References 27 publications

Analytical Model for Predicting the UCS from P-Wave Velocity, Density, and Porosity on Saturated Limestone

Analytical Model for Predicting the UCS from P-Wave Velocity, Density, and Porosity on Saturated Limestone

Study on the Mechanism of Ionic Stabilizers on Shale Gas Reservoir Mechanics in Northwestern Hunan

Prediction of Strength and Modulus of Jointed Rocks Using P-wave Velocity

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