摘要
为研究冻融循环作用对隧道围岩变形的影响,文章以沈阳某在建隧道为工程背景,通过三轴压缩试验获取不同冻融循环次数下该隧道砂岩的力学参数,然后采用MIDAS GTS NX建立不同冻融循环次数下隧道数值模型,分析冻融循环下隧道围岩的变形情况。结果表明:随着冻融循环次数的逐渐增大,砂岩三轴压缩应力-应变曲线峰前压密段逐渐明显,峰后曲线逐渐趋缓,残余强度特征逐渐显现,破坏模式逐渐转变为延性;由数值计算结果可知,随着冻融循环次数的逐渐增加,拱顶发生大幅沉降的范围逐渐增大,拱底隆起范围逐渐减小,水平收敛范围逐渐增大,左右边墙近似呈对称分布,隧道周围岩体的塑性区范围逐渐增大。
Aimed at the influence of the freeze-thaw cycle effect on surrounding rock deformation, based on the engineering background of a tunnel under construction in Shenyang, this paper obtained the mechanics parameters of tunnel sandstone by triaxial compression test under different freeze-thaw cycles, then established the numerical model by the MIDAS GTS NX tunnel under different freezing and thawing cycle times, and analyzed tunnel surrounding rock deformation under freeze-thaw cycles. The results showed that with the increase of the number of freeze-thaw cycles, the pre-peak compaction section of the triaxial compression stress-strain curve of sandstone is gradually obvious, the post-peak curve of sand is gradually slow, the characteristics of residual strength is gradually clear, and the failure mode gradually changes to ductility. The numerical results showed that with the gradual increase of the number of freeze-thaw cycles, the range of large subsidence of the arch gradually increases, the range of uplift of the arch bottom gradually decreases, the range of horizontal convergence gradually increases, the distribution of the left and right side walls is approximately symmetrical, and the range of plastic zone of the rock mass around the tunnel gradually increases.
作者
宋丹
SONG Dan(The Fifth Engineering Company of China Railway 19 Bureau Group Co.,Ltd.,Dalian 116100,Liaoning,China)
出处
《资源信息与工程》
2023年第1期80-84,共5页
Resource Information and Engineering
关键词
隧道工程
冻融循环
MIDAS
GTS
NX
围岩变形
tunnel engineering
freeze-thaw cycle
MIDAS GTS NX
deformation of surrounding rock
