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RISS 인기검색어
- 검색키워드
- 저자 : Mehmet Ozcelik (검색결과 2 건)
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Criteria for the Selection of Construction Method at the Ovit Mountain Tunnel (Turkey)
Mehmet Ozcelik 대한토목학회 2016 KSCE JOURNAL OF CIVIL ENGINEERING Vol.20 No.4
The Ovit Mountain Tunnel (OMT) is an highway tunnel under construction at Mount Ovit between Ikizdere (Rize) and Ispir (Erzurum) in NE Turkey. It will be the country's longest tunnel about 14700 m long in twin tubes. This paper compares and assesses tunnel excavation by Tunnel Boring Machine (TBM) excavation or drill and blast method for the OMT. Rock mass and material characteristics were evaluated to identify the excavation method. The rock mass classification of the tunnel grounds was performed by utilizing the Rock Mass Rating (RMR), Q system and New Austrian Tunnelling Method (NATM) which was followed by a geotechnical investigation along the tunnel. Twelve boreholes with a total length of 1116.5 m were drilled to assist and verify rock mass classifications. Seventy five rock samples were obtained for mechanical test. TBM method was selected at preliminary design stage of the OMT. But now, the OMT is driven by drill and blast method, using hydraulic excavators and the support is based on the principles of the NATM. The selection of this tunnelling excavation method was decided by morphological site conditions, geological, geotechnical site conditions, time and economic criteria.
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Leakage Analysis of Deriner Dam (Artvin-Turkey) Using 3D Modeling
Mehmet Ozcelik,Fatih Tuzlu 대한토목학회 2018 KSCE JOURNAL OF CIVIL ENGINEERING Vol.22 No.8
Leakage in engineering structures is considered as one of the main issues. Analysis of the amount of water leakage can be useful inpreventing such events. Deriner Dam consists of a concrete arch dam with ancillary structures including tunnels, and an undergroundpowerhouse with an installed capacity of 670 MW. Leakage was observed on the powerhouse after the construction stage. For thispurpose, a number of geotechnical data (including rheological and mechanical properties of the grout mixes) were re-assessed toexamine the source of leaking. For determination of leakage source, graphics of grout curtain were prepared by using grouting chartswith the RockWorks v.16 program. Leakage zones were obtained according to the prepared graphics and showed on 3D model. Theresults show that temperature variation of grouting mixes is the primary cause of leakage and its effect observed in the undergroundpowerhouse wall of the Deriner Dam.
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