• Document: Moglicë HPP - Albania. Jorge Terron
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Moglicë HPP - Albania Jorge Terron DEVOLL MOGLICË PROJECT Background Location Project Summary Sweco duties Plant overview Geology Cavern complex Layout Site investigations Rock mass characterization Geology interpretation Decision Stay or Moving Geomodel Rock support design Excavation Calculated response VS measured behaviour Conclusions Project location Banja HPP 64,6MW Kokel HPP 35,2MW Moglicë HPP 177MW Project Summary • Owner: Statkraft • Contractor: Limak-AJE JV (Turkey) • Head: 300 m • Two Francis units, total combined capacity 177 MW • 150 m high asphalt core dam • 17 km rock tunnels (6 km TBM + 11 km D&B) • 2 caverns • 4 vertical shafts • Difficult ground conditions • Permanent rock support designer Contract: Sweco • Basic Design: Norconsult • Owners designer: AFConsult General overview Drill and Blast ca. 11 km + shafts TBM part 6 km and caverns Sedimentary rocks Ophiolitic rocks 5 2017-05-08 Geology 6 Dam area Overview - Abutments Overview – Intake open cut Overview - Intake Overview - Spillway Overview - TBM Cavern complex - Moglicë • Site investigations: Nov 2015 to Feb 2016 • Excavation starts: Jan 2016 • Excavation and final support ends: Feb 2017 Plan view cavern complex • 300m water head Wet part • 60m long penstocks • Jointed rock 3 dimentional view cavern complex Access tunnel Access tunnel • PHC W16 x L62 x H35m • TRC W21 x L30 x H17m Cable tunnel • Pillar: 17m Junction tunnels Bus • Two bus galleries 30m2 • Two draft galleries Gate shaft • Two penstock galleries Draft/Tailrace tunnels Penstocks Evacuate tunnel Cavern complex- Site investigations - Limited amount of geo-information from Basic design - Decreasing rock mas quality when approaching the cavern complex - Sweco to decide on final location and design rock support Cavern complex- Site investigation strategy - Evaluation of rock mass quality and rock mass conditions from access tunnels - Two exploration core holes from access tunnels - Water loss tests - Stress measurements - Rock testing - Face mapping Interpretation + monitoring Geomodel Cavern complex- Rock mass conditions interpreted from tunnels - Mainly fair rock in tunnels, but poor in caverns - Continuity of zones of 35-40m - Lensed and undulated shapes - Orientation of Long axis of caverns deemed favourable compared to main joint sets - Stress measurements in Tender design => SH = 20 MPa, Sh = 9.5 MPa ,Sv= 9.5MPa. SH oriented NE-SW - Convergence measurements wall-to-wall in tunnels showing closure of 12mm in fair rock Cavern complex - Core drillings - Jointed harzburgites with presence of zones - High and rapid variability o rock mass quality - Sampling for testing - Brittle rock and many incipient joints - Often serpentinized, tight and smooth joints - Average rock mass quality Q=3 - Intact rock strength 40-75 MPa - Dry conditions in the drill holes. Only moisture at the zones Cavern complex- Core drillings interpretation - Jointed harzburgites with presence of zones - High and rapid variability of fracturation - West and upper part of the complex placed in a rock mass of poorer quality (Q1-3) and more serpentinized - Eastern and mid-lower part of the complex placed in rock mass of quality Q 2-4 - Reasonably tight rock mass K 1x10-8 m/s - Medium-strong rock 40-75 MPa (intact rock strength) - Brittle rock and many incipient joints Cavern complex- Rock testing - Jointed harzburgites with presence of zones from macro to microscale, mylonitised structure - Intact rock strength difficult to determine - Strength anysotropy - Swelling pressure 0.02MPa for serpentinite infillings - In general, br

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