摘要
针对软弱夹层对隧道开挖的影响问题,以软弱夹层的位置(1.5 d、2 d、2.5 d)和厚度(1 m、1.5 m、2 m)为研究对象,利用数值模拟分析软件Midas GTS NX,建立了9种工况下全断面分步开挖的数值模型并通过监测断面A(y=5 m)、B(y=10 m)、C(y=15 m)进行计算分析.结果表明:监测面A、B、C上各关键点的变形值中拱顶与拱底的变形量最大,其次为拱墙与拱脚.软弱夹层的位置越靠近隧道,各关键点的变形量越大,其次是软弱夹层的厚度越大,各关键点的变形量越大.在具有软弱夹层的隧道开挖工程中,应采取措施控制软弱夹层对隧道开挖的影响.
Abstract
In response to the impact of weak interlayers on tunnel excavation,the position(1.5 d,2 d,2.5 d)and thickness(1 m,1.5 m,2 m)of the weak interlayers are taken as the research object.By using numerical simulation analysis software Midas GTS NX,a numerical model for full section step-by-step excavation under 9 working conditions is established,and calculation and analysis are carried out by monitoring sections A(y=5 m),B(y=10 m),and C(y=15 m).The results show that among the deforma-tion values of key points on monitoring surfaces A,B,and C,the deformation of the arch top and arch bottom is the largest,fol-lowed by the deformation of the arch wall and arch foot.The closer the position of the weak interlayer is to the tunnel,the greater the deformation of each key point.Secondly,the thicker the weak interlayer,the greater the deformation of each key point.In tunnel ex-cavation projects with weak interlayers,measures should be taken to control the impact of weak interlayers on tunnel excavation.
基金项目
山东省自然科学基金面上项目(ZR2019MEE082)
国家科技期刊平台
NSTL
万方数据