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魏艷君^{1 ,2} ,  李    忠^{1 ,2}  ,  陳家征^{1 ,2}  ,  劉志鵬^{1 ,2}

( 1 .  石家莊鐵道大學 土木工程學院 ，石家莊 050043 ;

2.  道路與鐵道工程安全保障省部共建教育部重點實驗室 ，石家莊 050043)

摘   要 ：軟弱夾層的應變軟化特性使得隧道圍巖開挖易發生冒頂 、塌方等事故。以應變軟化特性本構關系， 基于勢能原理，建立雙應變軟化夾層組合下的折疊突變模型，推導出隧道圍巖突變失穩判據；通過 FLAC 3D 模擬軟件分析不同剪切模量下圍巖位移的變化規律。結果表明： 雙應變軟化夾層，位移的變化主要在軟弱夾層附近，隨著軟弱夾層周圍巖體剪切模量差距增大，夾層部位出現位移局部增大現象；且剪切模量越小， 圍巖越容易突變失穩；基于折疊突變理論建立的雙應變軟弱夾層隧道圍巖失穩判據是適用的，可以作為判別圍巖穩定性的補充，研究成果可為今后類似隧道工程設計 、施工提供指導借鑒作用。

關鍵詞：軟弱夾層 ；雙應變軟化 ；圍巖失穩 ；折疊突變模型 ；失穩判據

中圖分類號：U25           

文獻標志碼：A            

文章編號： 1005- 8249   (2025)  02- 0067- 07 

DOI:10. 19860/j.cnki.issn1005 - 8249.2025 .02.012

 

WEI Yanjun ^{1 , 2}  ,  LI Zhong ^1 , 2  ,  CHEN Jiazheng ^1 , 2  ,  LIU Zhipeng ^{1 , 2}

(1 . School of Civil Engineering ,  Shijiazhuang Tiedao University ,  Shijiazhuang 050043 ,  China;

2. Key Laboratory of Road and Railway Engineering Safety Assurance ,  Jointly Established by

the Ministry of Education and the Ministry of Education ,  Shijiazhuang 050043 ,  China)

Abstract: The strain softening characteristics of weak interlayers make tunnel surrounding rock excavation prone to accidents such as roof fall and collapse. Based on the principle of potential energy and the constitutive relationship of strain softening characteristics, a folded catastrophe model for the combination of dual strain softening interlayers is established, and a criterion for catastrophic instability of tunnel surrounding rock is derived. The results show that the displacement of the double strain softening interlayer mainly changes near the weak interlayer. As the difference in shear modulus between the weak interlayer and the surrounding rock mass increases, there is a local increase in displacement at the interlayer; Based on numerical simulation data, the displacement increment is fitted into a curve and transformed into a folded catastrophe model. It is found that the smaller the shear modulus, the more prone the surrounding rock is to sudden instability; The collapse catastrophe theory based criterion for surrounding rock instability in double strain weak intercalated tunnels is applicable and can be used as a supplement to judge the stability of surrounding rock. The research results can provide guidance and reference for the design and construction of similar tunnel projects in the future.

Key words: weak intercalation; double strain softening; instability of surrounding rock; folding mutation model; instability criterion

作者簡介：魏艷君  (1998—) ,  女 ，碩士研究生 ，研究方向：地質災害超前預報及隧道地下工程。

通信作者：李   忠  (1968—) ,  男 ，博士 ，教授 ，研究方向：地質災害超前預報及隧道地下工程。

收稿日期：2023 - 04 - 06