caa a22 4500 463174720 CHVBK 20180406164822.0 cr unu---uuuuu 170326e20070601xx s 000 0 eng 10.1007/s00603-006-0113-8 doi (NATIONALLICENCE)springer-10.1007/s00603-006-0113-8 An Experimental Damage Model and Its Application to the Evaluation of the Excavation Damage Zone [Elektronische Daten] [Soo-Ho Chang, Chung-In Lee, Youn-Kyou Lee] Summary.: An experimental damage model, which can simulate both post-peak and pre-peak damage characteristics of rock by assuming distinct elastic constants in each damage level, was proposed. Each damage level was identified by two successive threshold values of major principal stresses, which could be determined from uniaxial and triaxial compression tests and measurement of acoustic emissions. Elastic constants pertaining to each damage level were expressed in terms of confining pressure (minor principal stress) by regression equations of the experimental data. Post-peak behavior was simulated by selecting suitable values of the Hoek-Brown constants m r and s r for post-failure. The proposed experimental model was implemented into FLAC by writing a FISH function. The parametric studies on Hoek-Brown constants for post-peak behavior revealed that peak strength depends greatly more on s r than m r , and post-peak slopes of stress-strain curves depend mainly on m r . Together with the elastic and elasto-plastic models, the nonlinear-brittle-plastic damage model derived from experiments was applied to the evaluation of an excavation damage zone around a highly-stressed circular tunnel for the purpose of checking the performance of the model. Of the three models, the nonlinear-brittle-plastic damage model gave the largest extent of disturbed zones and displacements around the tunnel. The damage zone predicted by the nonlinear-brittle-plastic model became larger as the magnitudes and the stress differences of in-situ stresses increased. Consequently, taking the damage model into account in the stability analysis of hard rock tunnels may be appropriate for conservative design of a highly stressed tunnel. Springer-Verlag, 2007 Keywords: Excavation damage zone, damage model, Hoek-Brown criterion, damage threshold, post failure, acoustic emission nationallicence Chang Soo-Ho Geotechnical Engineering Research Department, Korea Institute of Construction Technology, Ilsan, Korea aut Lee Chung-In School of Civil, Urban and Geosystem Engineering, Seoul National University, Seoul, Korea aut Lee Youn-Kyou College of Ocean Science and Technology, Kunsan National University, Gunsan, Korea aut Rock Mechanics and Rock Engineering Springer-Verlag 40/3(2007-06-01), 245-285 0723-2632 40:3<245 2007 40 603 https://doi.org/10.1007/s00603-006-0113-8 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00603-006-0113-8 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Chang Soo-Ho Geotechnical Engineering Research Department, Korea Institute of Construction Technology, Ilsan, Korea aut NATIONALLICENCE 700 1- Lee Chung-In School of Civil, Urban and Geosystem Engineering, Seoul National University, Seoul, Korea aut NATIONALLICENCE 700 1- Lee Youn-Kyou College of Ocean Science and Technology, Kunsan National University, Gunsan, Korea aut NATIONALLICENCE 773 0- Rock Mechanics and Rock Engineering Springer-Verlag 40/3(2007-06-01), 245-285 0723-2632 40:3<245 2007 40 603 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer