摘要
隧道围岩压力的确定一直是隧道结构设计中的关键,而黄土隧道的工程特性与其它岩质隧道有着明显的区别。文章通过对18座黄土隧道的44个监测断面的围岩压力数据进行统计,分析研究了黄土隧道围岩压力的分布特征及垂直围岩压力随隧道埋深、跨度的关系,并将按照隧道规范计算的围岩压力值与现场实测竖向最大值进行了对比分析。结果表明,黄土隧道垂直围岩压力随隧道埋深、跨度的增大而呈现增大的趋势,V级围岩的现场实测围岩压力总体上大于Ⅳ级围岩;侧压力系数明显大于隧道规范的建议取值且与隧道埋深没有明显的相关性;得到了按规范方法计算的隧道围岩压力值和实测值的比值的分布关系。
The determination of surrounding rock pressure in tunnels has always been a key issue in the design of tunnel structures.The engineering characteristics of loess tunnels differ significantly from other types of rock tunnels.Based on the statistics of the surrounding rock pressure data of 44 monitoring sections of 18 loess tunnels,the distribution characteristics of the surrounding rock pressure in the loess tunnel,the relationship between the vertical surrounding rock pressure and the depth as well as span of the tunnel are analyzed and calculated according to the tunnel specifications.The rock pressure value is compared with the vertical maximum measured on site.The vertical pressure of the surrounding rock of the loess tunnel increases with the depth and span of the tunnel.The measured surrounding rock pressure of the V-grade surrounding rock is generally greater than that of the IV-grade surrounding rock;the lateral pressure coefficient is obviously larger than the tunnel specification.There is no obvious correlation between the value of lateral pressure coefficient and the buried depth of the tunnel;the distribution relationship between the pressure value of the surrounding rock of the tunnel and the measured value is calculated according to the standard method.
作者
于丽
吕城
王明年
华阳
YU Li;LV Cheng;WANG Mingnian;HUA Yang(School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031;Key Laboratory of Transportation Tunnel Engineering of Ministry of Education, Southwest Jiaotong University,Chengdu 610031)
出处
《现代隧道技术》
EI
CSCD
北大核心
2018年第A02期901-908,共8页
Modern Tunnelling Technology
基金
中国铁路总公司科技研究开发计划课题(2017G007-G-2)
关键词
围岩压力
黄土隧道
现场实测
统计
Surrounding rock pressure
Loess tunnel
Statistics
Field measurement
