Application of T-matrix model for static moduli approximation from dynamic moduli determined by sonic well logging

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985831%3A_____%2F18%3A00496840" target="_blank" >RIV/67985831:_____/18:00496840 - isvavai.cz</a>

Alternative codes found

RIV/00216208:11310/18:10388369 RIV/00025798:_____/18:00000118

Result on the web

<a href="http://dx.doi.org/10.1016/j.ijrmms.2018.10.031" target="_blank" >http://dx.doi.org/10.1016/j.ijrmms.2018.10.031</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.ijrmms.2018.10.031" target="_blank" >10.1016/j.ijrmms.2018.10.031</a>

Result language

angličtina

Original language name

Application of T-matrix model for static moduli approximation from dynamic moduli determined by sonic well logging

Original language description

The paper examines the proposed approach of using T-matrix model to convert dynamic moduli (Young's modulus and Poisson's ratio) determined by sonic well logging to values equivalent to values of static moduli (called effective moduli). The chosen approach is particularly suitable for rock masses consisting of solid rocks with irregular local cracking. The proposed approach is based on the fact that for intact rock with Young's modulus values on the order of several tens of GPa and strength σc on the order of several tens of MPa, the values of static and dynamic moduli are equivalent. Any fractures in the rock will cause the elastic behaviour to cease being linear and a difference will appear between the values of static and dynamic moduli. It is possible to approximate this difference using the T-matrix model.nnThe starting point for creating a T-matrix model is a simplified layered geological model of a borehole profile. Added to this are values of static moduli determined by a uniaxial compression test on representative samples of the borehole core. Additional input data for calculating the T-matrix model include porosity determined from well logging measurements, and the presence of cracks as interpreted from an acoustic scan of the borehole wall. The given approach is demonstrated in the experimental measurement of a borehole in Silurian limestone. The procedure was verified by comparing the calculated effective moduli with values of static moduli, measured on control samples prepared from borehole core outside the collection intervals of samples used as input for calculation of the T-matrix model. This comparison showed that for majority of samples there was a decrease in the difference from nearly 40% (dynamic moduli) to under 10% (effective moduli).

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

20701 - Environmental and geological engineering, geotechnics

Project

—

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2018

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

International Journal of Rock Mechanics and Mining Sciences

ISSN

1365-1609

e-ISSN

—

Volume of the periodical

112

Issue of the periodical within the volume

December

Country of publishing house

GB - UNITED KINGDOM

Number of pages

9

Pages from-to

281-289

UT code for WoS article

000452314500025

EID of the result in the Scopus database

2-s2.0-85056186680