Study on seismic vulnerability of highway tunnels considering lining thinning and voids
The voids behind the lining and lining thinning are typical quality defects of operating tunnels in China,and these defects will directly affect the seismic resistance performance of the tunnel structure and aggravate the seismic damage to tunnels.In recent years,studies on the effects of quality defects on the seismic performance of tunnel structures have mostly used deterministic analysis methods,lacking quantitative assessment from a probabilistic perspective considering the stochastic randomness of earthquake waves.This study conducted a series of tunnel earthquake response time-history analyses using the increment dynamic analysis(IDA)method based on a two-lane operational highway tunnel in Yunnan Province.The analysis considered the combination of voids and lining thinning.In accordance with the theory of tunnel seismic vulnerability analysis,this study established a seismic vulnerability curve for highway tunnels under the influence of combined defects.The influence of factors such as defect degree,defect location,surrounding rock classification,and earthquake wave input direction on the vulnerability of the tunnels are investigated.Results show that the degree of lining thinning and voids combined defects,defects location,surrounding rock classification,and earthquake wave input direction have significant influence on the seismic vulnerability of tunnels.Presence of combined defects increases the vulnerability of the tunnel structure,with an increasing non-linear probability of lining seismic damage as the severity of combined defects increases.The degree of impact of quality defects on tunnel vulnerability varies with the location of occurrence,with defects in the shoulder area of the arch having a greater impact on tunnel vulnerability than the vault.The worse the surrounding rock,the more obvious the effect of defects on tunnel vulnerability.The tunnel vulnerability under the direction of horizontal seismic is apparently greater than that under the direction of vertical,and the sensitivity of tunnel vulnerability to earthquake wave input directions varies with the location of the defects.The vulnerability of the tunnel structure is more affected by vertical seismic direction when the defect is located at the shoulder of the arch and more affected by horizontal seismic direction when the defect is located at the top of the arch.
highway tunnelslining thinning and voidssurrounding rock classificationearthquake wave input directionvulnerability curve
NETL
NSTL
万方数据
维普
