A failure criterion for foliation and its application for strength estimation of foliated metamorphic rock

Weng, Meng-Chia; Li, Hung-Hui; Fu, Yu-Yao; Fang, Chih-Hung; Chen, Hao-Ren; Chang, Ching-Jin

doi:10.1016/j.ijrmms.2022.105086

Cited by 12 publications

(1 citation statement)

References 31 publications

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“…Metamorphic rock has a unique foliation IOP Publishing doi:10.1088/1755-1315/1233/1/012008 2 structure. Foliation affects the mechanical properties, which causes high anisotropy and heterogeneity conditions [3].…”

Section: Introductionmentioning

confidence: 99%

EXCASS system and Rock Mass Rating (RMR) classification for determining excavation method and tunnel support at Pelosika Dam Spillway Tunnel

Wisnuaji,

Setiawan,

Setiawan

2023

IOP Conf. Ser.: Earth Environ. Sci.

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Pelosika dam spillway tunnel was designed to drainage flood discharge and prevent overtopping. In recent investigations, the rock mass classification has not been done specifically in the spillway tunnel. This research aims to obtain technical geological data and information to define excavation methods and tunnel support. For more comprehensive research, engineering geological investigations were carried out regarding the Geological Strength Index (GSI), selecting excavation methods using EXCASS system and Rock Mass Rating (RMR) for tunnel support. The geological mapping showed that the study site was composed of 2 lithological units: quartz muscovite phyllite and pebblely sand deposits. The GSI value in the tunnel is between 14-25, indicating poor and very poor quality. Adopting the EXCASS system, the optimum method of excavation (EPIopt) in the Pelosika dam spillway tunnel are ripper easy and digger. While RMR values of 9 – 25 are classified as poor quality. Consequently, the appropriate method for the excavation sequence is using the top heading and bench and multiple drifts. And the recommended support system is a systematic rock bolt with wire mesh and shotcrete in the crown and walls with medium to light steel rib.

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Section: Introductionmentioning

confidence: 99%