In situ stress determination from excavation-induced stress by the compact conical-ended borehole overcoring method

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68145535%3A_____%2F16%3A00462327" target="_blank" >RIV/68145535:_____/16:00462327 - isvavai.cz</a>

Result on the web

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DOI - Digital Object Identifier

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Result language

angličtina

Original language name

In situ stress determination from excavation-induced stress by the compact conical-ended borehole overcoring method

Original language description

The Compact Conical Borehole Overcoring (CCBO) method originally developed in Japan tondetermine stress in rock has been widely used by the Institute of Geonics, Czech Academy of Sciences. Only one borehole is required to install the CCBO instrument, measure strains and determine the full stress tensor in rock mass. To determine the pre-mining stress around the circular tunnel in undisturbed hard rock, the measurement requires a borehole of certain length to install the CCBO cell in location where the excavation does not affect the stress field.To reduce the drilling and installation costs, the Institute is developing new theoretical solutions for a short borehole strain measurement method enabling the CCBO cell installation closer to the circular tunnel. Thenproposed semi-analytical approach uses the short borehole strain measurement results, theoretical calculations of stress distribution in the elastic medium around the circular tunnel and numerical modelling, to back analyze the probable pre-mining stress tensor. This approach enables determination of pre-mining stress obtained from the short borehole strain measurements in excavation-induced zone around underground opening. Discussed here are the theoretical calculation methods, numerical modelling results and a practical example of the pre-mining stress determination from the short borehole strain measurements using the CCBO instrument.

Czech name

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Czech description

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Type

D - Article in proceedings

CEP classification

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OECD FORD branch

20703 - Mining and mineral processing

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2016

Confidentiality

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

Article name in the collection

Rock Mechanics and Rock Engineering: From the Past to the Future

ISBN

978-1-138-03265-1

ISSN

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e-ISSN

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Number of pages

4

Pages from-to

1203-1206

Publisher name

CRC Press, Taylor and Francis Group

Place of publication

London

Event location

Cappadocia

Event date

Aug 29, 2016

Type of event by nationality

WRD - Celosvětová akce

UT code for WoS article

000719660400085