- 권한신청
- P-ISSN2233-8292
- E-ISSN2287-4747
- KCI
ISSN : 2233-8292
3권 4호
초록
Abstract
Generally, it has been noted that underground structures have a consistent record of suffering much less damage thansurface facilities during earthquakes; but it is still necessar subject to earthquake loadings and to provide the appropriate m ethod for the seismic analysis of underground tunnelstructures since many types of underground structures have been and will be constructed in countries situated withinground tunnel structures are performed by using quasi-static analysis method and dynamic analysis method. Second, se ismic analyses in tunnel portals are performed by usingabove methods. The results of seismic analyses for the tunnel s tructure show that the tunnel structure conforms toground deformation and that seismic design by using the quasi-s tatic analysis method is more conservative than that byusing the dynamic analysis. The results of the dynamic FEM anal ysis for the tunnel structure show that the simplified 2-is can be adopted for seismic analysis. Finally, theresults of the dynamic FEM analysis in tunnel portals show that the force acting on the lining is largest near to thetunnel portal when an earthquake wave propagates parallel to tu nnel axis.
초록
Abstract
Four road tunnels of which the construction conditions were sim ilar were selected in the paper, and laboratory testsand rockmass classification for the tunnels were carried out. A nd the analysis was performed to find out the correlationpattern of tunnel using jumbo drill machine. It wasanalyzed that there was average abrasion of bit from 11.85% to 3.25% per support patterns of tunnel in four tunnels.Drilling parameter happens to fluctuate according to extent of fracture zone.
초록
Abstract
As the topography of Korea consists of mountains at about seven for tunnel construction according to the expansion of the exist ing highway and construction of new highway. Theconcrete lining of tunnel portals has been designed with reinfo temperature in the inside and outside of tunnel. In the paper, the application of steel fiber reinforcement concrete wasanalyzed as the lining concrete at tunnel portals and through steel fiber reinforcement concrete was assessed as the lining m ember of tunnel portal.
초록
Abstract
Recently, as tunnel structures are getting older and decrepit, many tunnel inspections are carried out for evaluatingthe tunnel state and safety. But, because there is no exact sta ndard for tunnel state and safety, depending on subjectivedecision, the new standard to assess the tunnel state is requir of the state of tunnel lining is not considered the characteris tics of tunnel as underground structures. Also, the item ofassessment and process of grading and classifying the state of tunnel is not objective and systemetic. In this study, newstandard for assessment of tunnel state is presented for improv safety. In the new standard, the new items of assessment includ ing geotechnical condition were selected and graded, theprocess in classifying the tunnel state is quantitative for ob jective assessment for tunnel state. This new standard andmethod is practically used in effective safety inspection and d iagnosis and tunnel maintenance.