Empirical relations between compressive strength and porosity of siliciclastic rocks

Vernik, Lev; Bruno, Michael S.; Bovberg, C.A.

doi:10.1016/0148-9062(93)90004-w

Cited by 185 publications

(42 citation statements)

References 3 publications

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“…8a.1). Vernik et al (1993;Eq. 25) predict much higher UCS for low-porosity sandstones ( < 15 %) and lower UCS for high-porosity sandstones ( > 25 %) than Eqs.…”

Section: Comparison With Previous Studiesmentioning

confidence: 99%

Empirical relations of rock properties of outcrop and core samples from the Northwest German Basin for geothermal drilling

Reyer

Philipp

2014

Geoth. Energ. Sci.

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Abstract. Information about geomechanical and physical rock properties, particularly uniaxial compressive strength (UCS), are needed for geomechanical model development and updating with logging-while-drilling methods to minimise costs and risks of the drilling process. The following parameters with importance at different stages of geothermal exploitation and drilling are presented for typical sedimentary and volcanic rocks of the Northwest German Basin (NWGB): physical (P wave velocities, porosity, and bulk and grain density) and geomechanical parameters (UCS, static Young's modulus, destruction work and indirect tensile strength both perpendicular and parallel to bedding) for 35 rock samples from quarries and 14 core samples of sandstones and carbonate rocks.With regression analyses (linear-and non-linear) empirical relations are developed to predict UCS values from all other parameters. Analyses focus on sedimentary rocks and were repeated separately for clastic rock samples or carbonate rock samples as well as for outcrop samples or core samples. Empirical relations have high statistical significance for Young's modulus, tensile strength and destruction work; for physical properties, there is a wider scatter of data and prediction of UCS is less precise. For most relations, properties of core samples plot within the scatter of outcrop samples and lie within the 90 % prediction bands of developed regression functions. The results indicate the applicability of empirical relations that are based on outcrop data on questions related to drilling operations when the database contains a sufficient number of samples with varying rock properties. The presented equations may help to predict UCS values for sedimentary rocks at depth, and thus develop suitable geomechanical models for the adaptation of the drilling strategy on rock mechanical conditions in the NWGB.

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“…8a.1). Vernik et al (1993;Eq. 25) predict much higher UCS for low-porosity sandstones ( < 15 %) and lower UCS for high-porosity sandstones ( > 25 %) than Eqs.…”

Section: Comparison With Previous Studiesmentioning

confidence: 99%

Empirical relations of rock properties of outcrop and core samples from the Northwest German Basin for geothermal drilling

Reyer

Philipp

2014

Geoth. Energ. Sci.

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“…The changing strain mechanisms reflect the changing mechanical characteristic of the host medium. Within a PRZ nucleating in the Navajo Sandstone, shearing and compaction reduces porosity within the PRZ (see , for representative porosity values) and the region becomes work -hardened (Edmond & Paterson 1972), with a fundamental change in the mechanical character of the host sandstone such as increased cohesion (Vernik et al 1993) or a larger angle of internal friction (Underhill & Woodcock 1987).…”

Section: Interpretation Of Structurementioning

confidence: 99%

The nucleation and evolution of Riedel shear zones as deformation bands in porous sandstone

AHLGREN

2001

Journal of Structural Geology

108

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“…Sodium silicate gel caused a re nement in uence on the pore structure which signi cantly a ects the strength of CTB. Generally, ner pore structure is associated with higher strength of the porous medium [16] or cemented back ll [4,17]. Figure 3 shows the MIP results performed on CTBs with 0% and 0.4% SS and cured for 28 days.…”

Section: 2mentioning

confidence: 99%

Sodium Silicate Gel Effect on Cemented Tailing Backfill That Contains Lead‐Zinc Smelting Slag at Early Ages

Guo

Yang

et al. 2018

Advances in Materials Science and Engineering

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is paper presents the results of an experimental study on the priming effect of sodium silicate gel (SS) on cemented tailing backfill (CTB) that contains lead-zinc smelting slag. CTB and cemented paste (CP) containing lead-zinc smelting slag samples with SS of 0 and 0.4% of the mass of the slag were prepared and cured at 20°C for 1, 3, 7, and 28 days. Mechanical test and pore structure analyses were performed on the studied CTB samples, microstructural analyses (X-ray diffraction analysis and thermal gravity analysis) were performed on the studied CP samples, whereas the electrical conductivity of CTB was monitored. e results reveal that SS has a significant positive effect on cementitious activity of binder mixed by cement and lead-zinc smelting slag. is activation leads to the acceleration of binder hydration process, the formation of more cement hydration products in the CTBs, and the refinement of their pore structure, which is favorable for the strength development of CTB.

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Empirical relations between compressive strength and porosity of siliciclastic rocks

Cited by 185 publications

References 3 publications

Empirical relations of rock properties of outcrop and core samples from the Northwest German Basin for geothermal drilling

Empirical relations of rock properties of outcrop and core samples from the Northwest German Basin for geothermal drilling

The nucleation and evolution of Riedel shear zones as deformation bands in porous sandstone

Sodium Silicate Gel Effect on Cemented Tailing Backfill That Contains Lead‐Zinc Smelting Slag at Early Ages

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