TY - JOUR N2 - This article presents a case study of a large wedge failure. It took place during excavation of the last bench of storage cavern with an approximate dimension of 80 m long having a depth of 8 m. The adopted intervention followed a structured approach, which included immediate rock support, geotechnical and geological investigations in the failure zone and design modifications. Back analyses of the failure zone were also carried out to assess design parameters with observed geological conditions. Re assessment in the failure zone was carried out using modified design parameters, which included shorter benches, rock support installation schemes such as longer rock bolts, reinforced ribs of shotcrete and reduced construction advances. Geotechnical monitoring in and around failure zone were carried out for recording any alarming movements in the rock mass. Initially, geotechnical monitoring was carried out in the recently excavated zone of the cavern on a daily basis. Based on continuous monitoring data for at least one week, the frequency of subsequent monitoring can be decided. In most cases the deformation of rock mass was considerably less than the alarming values which were calculated based on detailed design for different rock classes. The paper discusses the failure, investigation, cause, assessment and remedial measures to complete the construction of cavern. L1 - http://journals.pan.pl/Content/109031/PDF/Archiwum-63-4-12-Mandal.pdf L2 - http://journals.pan.pl/Content/109031 PY - 2018 IS - No 4 EP - 974 DO - 10.24425/ams.2018.124987 KW - Wedge Failure KW - Unlined Rock Cavern KW - Design and Analysis KW - Geological Investigations A1 - Bhatkar, Tejas A1 - Usmani, Altaf A1 - Mandal, Anirban A1 - Nanda, Atal PB - Committee of Mining PAS VL - vol. 63 DA - 2018.12.17 T1 - Wedge Failure Analysis and Remedial Measures in Large Unlined Rock Cavern: a Case Study SP - 963 UR - http://journals.pan.pl/dlibra/publication/edition/109031 T2 - Archives of Mining Sciences ER -