Anti-seismic effect analysis of two kinds of surrounding rock grouting measures in the shallow and eccentric pressure section of tunnel portal
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摘要: 为进一步提高隧道洞口浅埋偏压段的震时安全性，依托某铁路隧道洞口段工程，利用有限差分数值计算软件对两种围岩注浆抗震措施的抗震效果进行了研究，对比分析了围岩采用接触注浆与间隔注浆两种抗震措施对隧道衬砌结构位移以及内力的影响。研究结果表明：围岩采用接触注浆抗震措施后，二衬结构横向及纵向位移分别减小了86.7%、38.1%，轴力及弯矩平均减小了45.12%、64.20%，最小安全系数平均提高了61.36%；围岩采用间隔注浆抗震措施后，二衬结构横向及纵向位移分别减小了49.3%、23.8%，轴力及弯矩平均减小了39.42%、44.90%，最小安全系数平均提高了43.11%；围岩采用接触注浆抗震措施的抗震效果优于间隔注浆抗震措施。研究成果可为隧道洞口段抗震技术的发展提供参考。Abstract: In order to further improve the safety of the shallow overburden and eccentric pressure section of the tunnel portal during earthquake, based on a railway tunnel portal section project, the seismic effect of two kinds of surrounding rock grouting anti-seismic measures were studied by using the finite difference numerical calculation software, and the influence of two kinds of anti-seismic measures of contact grouting and interval grouting on the displacement and internal force of the tunnel lining structure is compared and analyzed. After the contact grouting is adopted in the surrounding rock, the results show that the lateral and longitudinal displacements of the secondary lining structure are reduced by 86.7% and 38.1% respectively, the axial force and bending moment are reduced by 45.12% and 64.20% on average, and the minimum safety factor is increased by 61.36% on average; after interval grouting, the lateral and longitudinal displacements of the secondary lining structure are reduced by 49.3% and 23.8% respectively, the axial force and bending moment are reduced by 39.42% and 44.90% on average, and the minimum safety factor is increased by 43.11% on average. The anti-seismic effect of contact grouting is better than that of interval grouting. The research results can provide reference for the development of anti-seismic technology of tunnel portal section.
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