特大斷面公路隧道圍巖變形分析及支護(hù)優(yōu)化研究

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中圖分類號(hào)：TQ178;U455.4 文獻(xiàn)標(biāo)志碼：A 文章編號(hào)：1001-5922（2025）07-0168-04

Abstract：Inorder toexplore theinfluenceof the thicknessof theinitial supportshotcreteonthe stressanddeformationof the surrounding rock in tunnel construction，taking the Maanshan Tunnel from Deyang to Chengdusection of the Beijing-Kunming Expresswayasan example，F(xiàn)LAC 3D software was used to establish a three-dimensional solid modelof the tunnel with differentinitial support shotcrete thicknesses for numerical simulation，andthecalculated values were compared with theon-site monitoring data，and the stress and deformation laws of the surounding rock after the supportof different shotcrete thickneses were discussed.The results showed thatthe thicknessof shotcrete increased from 10 cm to 15，20 and 25 cm，and the surface deformation decreased by 4.14% ， 2.13% and 0.85% ， respectively，and the deformation of the vault decreased by 3.84%， 1.92% and 0.94% ，respectively.When the spray thickness was 20cm ，the deformation amplitude of the vault tent to be stable，and when the spray thickness increased from 20 cm to 25cm ，the confining pressure support stress was weakened，and the spraying thickness of 20cm was the optimal scheme and more economical.The comparison between the numerical simulation and the onsite monitoring data showed thatthe numerical calculated value was large and close to the measured data，and the prediction accuracy met the requirements of the guided construction.This case can provide reference experience for the implementation of numerical simulation，monitoring and measurement of similar tunnels in the future.

Key words：highway tunnel； surrounding rock deformation; initial support;；shotcrete;numerical simulation；monitoring and measurement

隨著國(guó)內(nèi)汽車工業(yè)的發(fā)展，許多地區(qū)的城市主干線、城市快速路、國(guó)道主干線繞城段交通量增長(zhǎng)迅速，8車道快速路擴(kuò)建工程和4車道變8車道（4改8）擴(kuò)建工程在一些地區(qū)已經(jīng)開始動(dòng)工。（剩余4804字）