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吳大勇

 

（中信建設有限責任公司 ，北京 100027)

摘   要：為有效評價變質軟巖隧道大變形的穩定性，并合理劃分其防治等級， 以上軍楞隧道為工程背景， 在開展其大變形特征分析基礎上，先利用尖點突變分析評價隧道大變形段的穩定性，再通過累計變形判據和變形速率判據開展隧道大變形的防治分級研究。結果表明： 上軍楞隧道在大變形分析斷面的變形監測成果中，其水平收斂的變形范圍為 142. 03 ~ 219. 28  mm ,  拱頂沉降的變形范圍為153 . 20 ~ 251 . 62  mm , 均明顯大于變形控制值，具顯著的變形特征。在大變形段的穩定性評價結果中，相應監測斷面條件下水平收斂的 Δ值均大于拱頂沉降的Δ值，即在隧道大變形段，拱頂沉降具相對更大的失穩 、塌方風險，且局部位置處的 Δ值已小于 0 ,  局部失穩風險較大。在隧道大變形段的防治分級研究結果中，兩類判據的分級結果存在一定差異，按不利原則，建議研究的大變形斷面均按Ⅳ級進行防治。因此，在上軍楞隧道施工過程中，一旦發生大變形，其穩定性一般相對偏弱，且具較高的防治等級，建議嚴格按照分析方法開展施工預警，避免造成不必要損失 ，為其后續施工提供了一定的技術指導。

關鍵詞： 隧道 ；大變形 ；穩定性 ；防治分級

中圖分類號：TU735           

文獻標志碼：A            

文章編號： 1005- 8249   (2025)  01- 0082- 07

DOI:10. 19860/j.cnki.issn1005 - 8249.2025 .01 .016

 

WU Dayong

(Citic Construction Co. ，Ltd. ，Beijing 100027 ,  China)

Abstract: In order to effectively evaluate the stability of large deformation in metamorphic soft rock tunnels and reasonably classify their prevention and control levels, the Junling Tunnel is taken as the engineering background. Based on the analysis of its large deformation characteristics, the stability of the large deformation section of the tunnel is first evaluated using sharp point mutation analysis. Then, the prevention and control classification of large deformation in the tunnel is studied through cumulative deformation criteria and deformation rate criteria. The analysis results show that in the deformation monitoring results of the large deformation analysis section of Shangjunleng Tunnel, the deformation range of horizontal convergence is 142.03-219.28 mm, and the deformation range of arch crown settlement is 153.20-251.62 mm, both of which are significantly greater than the deformation control values and have significant deformation characteristics. In the stability evaluation results of the large deformation section, the △ values of horizontal convergence under the corresponding monitoring section conditions are all greater than the △ value of arch crown settlement. That is to say, in the large deformation section of the tunnel, the arch crown settlement has a relatively greater risk of instability and collapse, and the △ value at local positions is less than 0, indicating a higher risk of local instability. In the research on the classification of prevention and control of large deformation sections in tunnels, there are certain differences in the classification results of the two criteria. According to the principle of disadvantage, it is recommended that the large deformation sections studied be prevented and controlled according to level IV. Therefore, in the construction process of Shangjunleng Tunnel, once large deformation occurs, its stability is generally relatively weak and has a high level of prevention and control. It is recommended to strictly follow the analysis method to carry out construction warning, avoid unnecessary losses, and provide certain technical guidance for its subsequent construction.

Key words: tunnel; large deformation; stability; prevention and control grading

作者簡介：吳大勇  (1979—) ,  男 ，研究生 ，正高級工程師 ，研究方向： 隧道與地下工程。

收稿日期：2023- 08 - 11