Stress State Change Monitoring Using Displacement Change Measurements

Frans Ritala; Topias Siren; Lauri Uotinen

Stress State Change Monitoring Using Displacement Change Measurements

Frans Ritala, Topias Siren, Lauri Uotinen

Department of Civil Engineering

Research output: Chapter in Book/Report/Conference proceeding › Conference article in proceedings › Scientific › peer-review

261 Downloads (Pure)

Abstract

A method to back calculate stress state change was developed in Dynamic Control of Underground Mining Operations (DynaMine) research project. The purpose of this method is to provide real-time estimates of the stress state change caused by excavation. In this paper the method is evaluated with in situ data analysis and using two-dimensional modelling. The method is based on linearly elastic modelling and multiple linear regression between the modelled engineering strains and measured engineering strains. The measurements were done at the Kylylahti mine and using data from Posiva´s ONKALO rock characterization facility as reference. The Kylylahti test site was instrumented with two 20 meter multipoint borehole extensometers. 2D modelling was used to analyse the test site conditions using both near field and far field models. The data obtained from the test site was used to track changes caused by an excavation approximately 30 meters from the test site. The resulting stress change estimates from both of the sites were generally too high. Possible
reasons for the too high estimates are discussed and suggestions for future research are given.

Original language	English
Title of host publication	7th International Symposium on In-Situ Rock Stress
Subtitle of host publication	Symposium Proceedings
Editors	Erik Johansson, Ville Raasakka
Place of Publication	Tampere, Finland
Publisher	Suomen rakennusinsinöörien liitto RIL
Number of pages	9
ISBN (Electronic)	978-951-758-606-1
Publication status	Published - 12 May 2016
MoE publication type	A4 Conference publication
Event	International Symposium on In-Situ Rock Stress - Tampere Hall, Tampere, Finland Duration: 10 May 2016 → 12 May 2016 Conference number: 7 http://www.ril.fi/en/events/rs2016/home.html

Publication series

Name	RIL
Publisher	Suomen rakennusinsinöörien liitto RIL
ISSN (Electronic)	0356-9403

Conference

Conference	International Symposium on In-Situ Rock Stress
Abbreviated title	RS2016 Symposium
Country/Territory	Finland
City	Tampere
Period	10/05/2016 → 12/05/2016
Internet address	http://www.ril.fi/en/events/rs2016/home.html

Keywords

stress state change
Kylylahti mine
ONKALO
extensometer
real-time
back calculation
in-situ test
multiple linear regression

Access to Document

Stress State Change Monitoring Using Displacement Change MeasurementsFinal published version, 478 KB

Cite this

@inproceedings{571dcb9ce98b44ee905e18b528b0ce6f,

title = "Stress State Change Monitoring Using Displacement Change Measurements",

abstract = "A method to back calculate stress state change was developed in Dynamic Control of Underground Mining Operations (DynaMine) research project. The purpose of this method is to provide real-time estimates of the stress state change caused by excavation. In this paper the method is evaluated with in situ data analysis and using two-dimensional modelling. The method is based on linearly elastic modelling and multiple linear regression between the modelled engineering strains and measured engineering strains. The measurements were done at the Kylylahti mine and using data from Posiva´s ONKALO rock characterization facility as reference. The Kylylahti test site was instrumented with two 20 meter multipoint borehole extensometers. 2D modelling was used to analyse the test site conditions using both near field and far field models. The data obtained from the test site was used to track changes caused by an excavation approximately 30 meters from the test site. The resulting stress change estimates from both of the sites were generally too high. Possiblereasons for the too high estimates are discussed and suggestions for future research are given.",

keywords = "stress state change, Kylylahti mine, ONKALO, extensometer, real-time, back calculation, in-situ test, multiple linear regression",

author = "Frans Ritala and Topias Siren and Lauri Uotinen",

year = "2016",

month = may,

day = "12",

language = "English",

series = "RIL",

publisher = "Suomen rakennusinsin{\"o}{\"o}rien liitto RIL",

editor = "Erik Johansson and Ville Raasakka",

booktitle = "7th International Symposium on In-Situ Rock Stress",

address = "Finland",

note = "International Symposium on In-Situ Rock Stress, RS2016 Symposium ; Conference date: 10-05-2016 Through 12-05-2016",

url = "http://www.ril.fi/en/events/rs2016/home.html",

}

Stress State Change Monitoring Using Displacement Change Measurements. / Ritala, Frans; Siren, Topias ; Uotinen, Lauri.
7th International Symposium on In-Situ Rock Stress: Symposium Proceedings. ed. / Erik Johansson; Ville Raasakka. Tampere, Finland: Suomen rakennusinsinöörien liitto RIL, 2016. (RIL).

Research output: Chapter in Book/Report/Conference proceeding › Conference article in proceedings › Scientific › peer-review

TY - GEN

T1 - Stress State Change Monitoring Using Displacement Change Measurements

AU - Ritala, Frans

AU - Siren, Topias

AU - Uotinen, Lauri

N1 - Conference code: 7

PY - 2016/5/12

Y1 - 2016/5/12

N2 - A method to back calculate stress state change was developed in Dynamic Control of Underground Mining Operations (DynaMine) research project. The purpose of this method is to provide real-time estimates of the stress state change caused by excavation. In this paper the method is evaluated with in situ data analysis and using two-dimensional modelling. The method is based on linearly elastic modelling and multiple linear regression between the modelled engineering strains and measured engineering strains. The measurements were done at the Kylylahti mine and using data from Posiva´s ONKALO rock characterization facility as reference. The Kylylahti test site was instrumented with two 20 meter multipoint borehole extensometers. 2D modelling was used to analyse the test site conditions using both near field and far field models. The data obtained from the test site was used to track changes caused by an excavation approximately 30 meters from the test site. The resulting stress change estimates from both of the sites were generally too high. Possiblereasons for the too high estimates are discussed and suggestions for future research are given.

AB - A method to back calculate stress state change was developed in Dynamic Control of Underground Mining Operations (DynaMine) research project. The purpose of this method is to provide real-time estimates of the stress state change caused by excavation. In this paper the method is evaluated with in situ data analysis and using two-dimensional modelling. The method is based on linearly elastic modelling and multiple linear regression between the modelled engineering strains and measured engineering strains. The measurements were done at the Kylylahti mine and using data from Posiva´s ONKALO rock characterization facility as reference. The Kylylahti test site was instrumented with two 20 meter multipoint borehole extensometers. 2D modelling was used to analyse the test site conditions using both near field and far field models. The data obtained from the test site was used to track changes caused by an excavation approximately 30 meters from the test site. The resulting stress change estimates from both of the sites were generally too high. Possiblereasons for the too high estimates are discussed and suggestions for future research are given.

KW - stress state change

KW - Kylylahti mine

KW - ONKALO

KW - extensometer

KW - real-time

KW - back calculation

KW - in-situ test

KW - multiple linear regression

M3 - Conference article in proceedings

T3 - RIL

BT - 7th International Symposium on In-Situ Rock Stress

A2 - Johansson, Erik

A2 - Raasakka, Ville

PB - Suomen rakennusinsinöörien liitto RIL

CY - Tampere, Finland

T2 - International Symposium on In-Situ Rock Stress

Y2 - 10 May 2016 through 12 May 2016

ER -

Stress State Change Monitoring Using Displacement Change Measurements

Abstract

Publication series

Conference

Keywords

Access to Document

Fingerprint

Cite this