首页|Evaluation of excavation damaged zones(EDZs)in Horonobe Underground Research Laboratory(URL)

Evaluation of excavation damaged zones(EDZs)in Horonobe Underground Research Laboratory(URL)

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Excavation of underground caverns,such as mountain tunnels and energy-storage caverns,may cause the damages to the surrounding rock as a result of the stress redistribution.In this influenced zone,new cracks and discontinuities are created or propagate in the rock mass.Therefore,it is effective to measure and evaluate the acoustic emission(AE)events generated by the rocks,which is a small elastic vibration,and permeability change.The authors have developed a long-term measurement device that in-corporates an optical AE(O-AE)sensor,an optical pore pressure sensor,and an optical temperature sensor in a single multi-optical measurement probe(MOP).Japan Atomic Energy Agency has been conducting R&D activities to enhance the reliability of high-level radioactive waste(HLW)deep geological disposal technology.In a high-level radioactive disposal project,one of the challenges is the development of methods for long-term monitoring of rock mass behavior.Therefore,in January 2014,the long-term measurements of the hydro-mechanical behavior of the rock mass were launched using the developed MOP in the vicinity of 350 m below the surface at the Horonobe Underground Research Center.The measurement results show that AEs occur frequently up to 1.5 m from the wall during excavation.In addition,hydraulic conductivity increased by 2-4 orders of magnitude.Elastoplastic analysis revealed that the hydraulic behavior of the rock mass affected the pore pressure fluctuations and caused micro-fractures.Based on this,a conceptual model is developed to represent the excavation damaged zone(EDZ),which contributes to the safe geological disposal of radioactive waste.

Excavation damaged zone(EDZ)Optical sensorLong-term monitoringAcoustic emission(AE)Shaft sinking

Koji Hata、Sumio Niunoya、Kazuhei Aoyagi、Nobukatsu Miyara

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Obayashi Corporation,Technology Research Institute,Technology Division,Kiyose,Tokyo,204-8558,Japan

Obayashi Corporation,Nuclear Facilities Division,Sinagawa,Tokyo,108-8502,Japan

Japan Atomic Energy Agency,Horonobe Underground Research Center,Horonobe,Hokkaido,098-3224,Japan

2024

10.1016/j.jrmge.2023.05.010

岩石力学与岩土工程学报(英文版)
中国科学院武汉岩土力学所中国岩石力学与工程学会武汉大学

岩石力学与岩土工程学报(英文版)

CSTPCD
影响因子：0.404
ISSN：1674-7755
年,卷(期)：2024.16(2)
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