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(사)한국터널지하공간학회

ISSN : 2233-8292

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Vol.13 No.3

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Analysis and cause of occurrence of lining cracks on NATM tunnel based on the precise inspection for safety and diagnosis - Part I

(사)한국터널지하공간학회 / (사)한국터널지하공간학회, (P)2233-8292; (E)2287-4747
2011, v.13 no.3, pp.199-214





& (2011). Analysis and cause of occurrence of lining cracks on NATM tunnel based on the precise inspection for safety and diagnosis - Part I. (사)한국터널지하공간학회, 13(3), 199-214.

Abstract

A crack is the main cause to affect the integrity of tunnel lining as well as leakage, spalling, exposed rebar, corrosion, carbonation and so on. Since the 1980, NATM has prevailed on excavation method and geotechnical philosophy in tunnel. Although the pattern of cracks has been reported by several engineers’ effort, it was only focused on longitudinal cracks of lining. 11 operational NATM tunnels have been conducted with the precise inspection for safety and diagnosis by KISTEC (Korea Infrastructure Safety and Technology Incorporation). With those results, the crack patterns by the spatial distribution and appearance for each tunnel have been analyzed and the cause of occurrence for 7 common types of cracks in NATM tunnels was classified. Additionally, the longitudinal crack on lining above duct slab was figured out by numerical simulation and field inspection. Each crack has been analyzed by CCD(Charge- Coupled Device) scanner image with 3D configuration. Each type of cracks is also explained with output of experimental and condition of construction. Defined cracks on NATM tunnels will be good example for periodical inspection and precise inspection for safety and diagnosis.

keywords
NATM, 종균열, 횡균열, 사균열, CCD스캐너 이미지, NATM, longitudinal crack, transverse crack, oblique crack, operational tunnel, NATM, longitudinal crack, transverse crack, oblique crack, operational tunnel

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