汶川地震公路隧道震害规律研究

发布时间：2019-04-24 00:20

【摘要】：结合汶川地震灾区公路隧道震害资料,文章制定了公路隧道震害量化指标并进行分级,对汶川地震公路隧道震害规律进行了研究。研究结果表明:隧道衬砌开裂长度占隧道总长度比例最高,二次衬砌垮塌及仰拱错台长度次之;多数震害类型在V级围岩中发生的比例均高于其它级别围岩;X、XI度地震烈度区,断层段破坏程度最严重,其次是洞口段;震害严重程度随震中距增加而迅速衰减,发生严重以上震害的隧道集中于10 km以内,近三分之二发生于20 km范围;坚硬岩体中的隧道,震害程度随埋深增加而减轻,软弱围岩中的隧道,震害程度与埋深关系不明确;发生严重以上震害的隧道,实际地震烈度均高于设防烈度,出现中等震害的隧道,近三分之二的隧道实际地震烈度高于设防烈度;隧道轴线与发震断层交角为60°~90°,震害严重,轴线与发震断层交角为30°~60°,震害相对较轻;防水板致使初期支护和二次衬砌在地震时不能协同工作,增加震害风险。
[Abstract]:Based on the seismic damage data of highway tunnels in Wenchuan earthquake-stricken area, this paper formulates the quantitative indexes and classifies the earthquake damage of highway tunnels in Wenchuan earthquake area, and studies the rules of earthquake damage of highway tunnels in Wenchuan earthquake area. The results show that the crack length of tunnel lining accounts for the highest proportion of the total length of the tunnel, followed by the collapse of secondary lining and the length of inverted arch dislocation platform, and the proportion of most earthquake damage types occurring in V-grade surrounding rock is higher than that of other grade surrounding rocks. In the seismic intensity area of X and XI degree, the damage degree of fault segment is the most serious, followed by the Dongkou section; The severity of earthquake damage decreases rapidly with the increase of epicenter distance. The tunnels with severe earthquake damage are concentrated within 10 km, and nearly 2/3 of them occur in the range of 20 km. In the tunnel of hard rock mass, the degree of earthquake damage decreases with the increase of buried depth, but the relation between the degree of earthquake damage and buried depth is not clear in the soft surrounding rock. The actual seismic intensity of tunnels with serious earthquake damage is higher than that of fortification. The actual seismic intensity of tunnels with moderate earthquake damage is higher than that of fortification in nearly 2/3 tunnels. The angle of intersection between tunnel axis and earthquake-generating fault is 60 掳~ 90 掳, the seismic damage is serious, the intersection angle between axis and earthquake generating fault is 30 掳~ 60 掳, the damage is relatively light, the waterproof plate makes the initial support and secondary lining unable to work together during the earthquake, and increases the risk of earthquake damage.
【作者单位】：福建工程学院土木工程学院;地下工程福建省高校重点实验室;
【基金】：福建省自然科学基金项目(2016J01205,2014J01170) 中铁二十四局集团福建铁路建设有限公司科研项目(GY-H-15034)
【分类号】：U452.28

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