摘要
以玉磨铁路曼么二号隧道为背景,分析软岩隧道受力特征,以及施作临时仰拱对隧道围岩压力、位移的影响,为以后的工程方案比选提供参考。通过采用数值模拟和现场监测实际数据对比分析的方法,分析了三维隧道围岩、钢拱架的真实受力状态,模拟了有无临时仰拱时隧道的围岩压力和位移变化情况;探讨在软弱围岩地质情况下,有无临时仰拱对隧道应力场和位移场的影响,得出了施作临时仰拱对控制软弱围岩隧道的变形效果比较明显。结果表明:钢拱架右侧受力明显大于左侧,玉磨铁路曼么二号隧道受力不对称,可能存在偏压现象;实测数据与模拟数值变化趋势基本相同,验证了MIDAS/GTS能够有效地模拟隧道施工过程;通过模拟对比分析,施作临时仰拱时拱顶沉降值减小了15.5%,左拱腰位移减小了69%,右拱腰位移减小了66.7%,隧道围岩压力最大值为143.4 kPa,出现在拱顶位置,最大围岩压力减小了6.5%。
To analyze the stress characteristics of the soft rock tunnel and the effect of the temporary inverted arch on the surrounding rock pressure and displacement of the tunnel in the Yumo No.2 Tunnel of Yumao Railway was studied to provide a reference for the subsequent comparison of engineering schemes.Comparative analysis was conducted using actual data,numerical simulation,and on-site monitoring.The true stress state of the surrounding rock and steel arch of the three-dimensional tunnel were analyzed.The variation of surrounding rock pressure and displacement of the tunnel with or without temporary inversion is simulated.The influence of the temporary invert arch on the stress field and displacement field of the tunnel under the condition of weak surrounding rock geological conditions were discussed.Results show that the deformation effect of the temporary invert arch were small for controlling the soft surrounding rock tunnel.The right-hand side of the steel arch were significantly more stressed than the left-hand side.The tunnel was asymmetrical and there were a possibility of bias.The trend of variation of measured data and the simulated value are the same in overall,which verifies that using software MIDAS/GTSNX the tunnel construction process can be simulated effectively.Through simulation and comparison analysis,the settlement value of the vault was reduce by 15.5%when temporary invert is applied.The displacement of the left arch were reduced by 69%and the displacement of the right arch by 66.7%.The maximum pressure of the surrounding rock of the tunnel were 143.4 kPa in the vault position,and the maximum surrounding rock pressure were reduced by 6.5%.
作者
曹明星
李德武
张东
徐建涛
CAO Ming-xing;LI De-wu;ZHANG Dong;XU Jian-tao(School of Civil Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China;China Railway 7th Bureau Group Co.,Ltd,Zhengzhou 450016,China)
出处
《科学技术与工程》
北大核心
2020年第15期6246-6251,共6页
Science Technology and Engineering
基金
中铁七局集团有限公司2016年度科技开发课题。
关键词
铁路隧道
现场监测
围岩压力
拱顶沉降
数值模拟
优化分析
railway tunnel
on-site monitoring
surrounding rock pressure
arch settlement
numerical simulation
optimization analysis
