Considering the actual on-site conditions such as large-span excavation and the influence of anchor rods during the con-struction process,the bearing capacity of elliptical tunnels,including the length,quantity,and pre-installation of anchor rods chan-ges in stress,lateral pressure coefficient,and plastic zone range were studied.Based on the method of plane elastic complex func-tion,the stress component expression of any point of the surrounding rock was obtained.Combined with Moore-Coulen(MC)crite-rion,the arch bearing capacity under the shear criterion and drawing criterion were obtained respectively.The influence of excavation radius and anchor parameters on the bearing capacity were discussed.The sensitivity of pore edge stress to different parameters was analyzed,especially for the shape parameter,which affecting its capacity directly.Combining the theory and 3DEC software,the correctness of the theoretical model was verified.
关键词
隧道工程/椭圆形隧洞/复变理论/承载力分析/预应力锚杆
Key words
tunnel engineering/oval tunnel/complex theory/bearing capacity analysis/pretension anchor rod
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