摘要
为了确定大断面黄土隧道深浅埋分界深度,结合郑州-西安高速铁路客运专线多条黄土隧道实际调查数据,通过对现有隧道深浅埋划分方法的分析,提出基于谢家烋公式的隧道深浅埋划分方法,当谢家烋公式松动压力出现极大值时对应埋深为深浅埋分界深度。通过对隧道实际破裂角β与计算破裂角β的比较,对公式中关键参数取值进行了分析。结果表明:(1)采用现有方法的大断面黄土隧道深浅埋划分深度介于1.2~5.6倍洞跨,分界深度区别较大;(2)谢家烋公式中摩擦角θ应取规范规定范围的下限值,此时隧道实际破裂角β与计算破裂角β较为接近;(3)老黄土隧道分界深度为37~50m,为2.5~3.4倍的洞跨,新黄土隧道分界深度为54~62m,为3.6~4.2倍的洞跨。
In order to determine the critical buried depth of large cross-section loess tunnel, the existing division methods were summarized and compared. After that, a new division method is proposed to partition the range of tunnel is deep or shallow tunnel based on Xie Jiaxiao's Formula and the survey data of loess tunnels collected from Zhengzhou to Xi'an high-speed railway line. The critical buried depth is therefore definite as the corresponding depth when the maximum value of relaxation pressure appears in Xie Jiaxiao's Formula. An analysis was carried out on the value of key parameter in the formula by comparing the actual β and calculated β. The research result indicated that(1) by existing division methods, the critical buried depth of large cross-section loess tunnel is in the range of 1.2~5.6 times tunnel span;(2)The actual β is more closer to the calculated β when θ in Xie Jiaxiao's Formula takes lower range value of criterion;(3) The critical buried depth of tunnel in old loess is in the ragne of 37~50 meters, about 2.5~3.4 times of tunnel span, while the critical buried depth of tunnel in new loess is in the range of 54~62 meters, about 3.6~4.2 times of tunnel span.
出处
《土木工程学报》
EI
CSCD
北大核心
2015年第S1期393-397,共5页
China Civil Engineering Journal
基金
国家自然科学基金项目资助(51378053)
关键词
大断面
黄土隧道
深浅埋
分界深度
large cross-section
loess tunnel
shallow-deep burial
critical depth
