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Seismic responses of fiber reinforced concrete tunnel#br#
lining with shaking table test |
MENG Guowang,ZHOU Jiamei,GAO Bo |
(Key Laboratory of Transportation Tunnel Engineering,Ministry of Education,Southwest Jiaotong University,
Chengdu,Sichuan 610031,China) |
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Abstract Seismic dynamic responses of the fiber reinforced concrete tunnel lining were studied with large scale shaking table model tests and by comparing with the plain concrete tunnel lining. The damage characteristics,dynamic strain,internal force and compressive deformation were analyzed. The cracking occurred in the invert at first,then in the haunch under the horizontal seismic load and rock-soil pressure for two kinds of tunnel lining. The failure modes are cracking,peeling and attrition crushing in cracks. Cracking damage appeared early and the penetrating cracks occurred easily in the plain concrete lining. The crack opening displacement was large in the loading process. Cracking damage appeared relevantly late in the fiber reinforced concrete lining and the crack opening displacement was small in the loading process,and the cracks presented an extrusion damage state. Fiber prevented the appearing and developing of cracks effectively. The maximum strains and crack width in plain concrete lining increased with the peak acceleration of seismic waves,while those in fiber reinforced concrete lining increased slowly in a certain range and then increased rapidly. The final maximum strains and crack width of two kinds of tunnel lining were almost the same. So it was certain that the fiber reinforced concrete effectively avoided cracking and reduced the crack width within a certain seismic load. The fiber reinforced concrete lining had the low extreme bending moments and a well-distributed stress when the input acceleration peak values were 0.1 g and 0.4 g,and it had small compressive deformation rate in the tests,which indicated that fiber reinforced concrete tunnel lining can resist seismic load effectively.
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