Anisotropy of elastic properties of rock mass induced by cracks

Title:

Anisotropy of elastic properties of rock mass induced by cracks

Creator:

Stan - Kleczek, Iwona and Idziak, Adam F.

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:35335d72-324c-4809-8b36-c2c4ac8cf4e2
uuid:35335d72-324c-4809-8b36-c2c4ac8cf4e2
issn:1214-9705

Subject:

Geologie. Meteorologie. Klimatologie, seizmicita, seismicity, dynamic elastic moduli, effective moduli, fracturing, seismic wave velocity, 7, and 551

Type:

article, články, model:article, and TEXT

Format:

print, bez média, and svazek

Description:

Fractures commonly existing in rocks flow on their elastic properties and hence on velocity of seismic waves propagating in the rock mass. This relation allows to use seismic methods to determine the fracture density and the orientation of fracture sets. This paper presents results of the research which concern directional changes of dynamic elastic moduli in sedimentary and igneous rocks from south part of Poland. These moduli depend on density of the rock matrix as well as density and orientation of cracks and flow on seismic wave velocity. The seismic equipment Terraloc MK6 (ABEM) was used for the measurements of seismic wave velocity in the surface layers of rock mass. The research was made along precise oriented radial seismic profiles. P-waves and S-waves ve locities were established from recorded seism ograms. The values of P and S waves velocity allowed to calculate values of dynamic elastic moduli for all profiles. The results were presented on diagrams of azimuth distribution of elastic moduli, and diagrams of dynamic elastic moduli versus P - wave velocity. The diagrams showed an anisotropy of elastic properties of the investigated rocks. The maximal values of moduli agree with maximal values of velocity and also with orientation of main crack sets or potential directions of weakening of rock mass. Obtained results point that the seismic methods allow to assign the directions of weakening of rocks what can be for example use during preliminary designing, constructing and exploitation of tunnels., Iwona Stan - Kleczek and Adam F. Idziak., and Obsahuje bibliografické odkazy

Language:

English

Rights:

http://creativecommons.org/licenses/by-nc-sa/4.0/
policy:public

Source:

Acta geodynamica et geomaterialia : | 2008 Volume:5 | Number:2 (150)

Harvested from:

CDK

Metadata only:

false