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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(xué) 土木工程學(xué)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(diǎn)實(shí)驗(yàn)室 ，石家莊 050043)

摘   要 ：軟弱夾層的應(yīng)變軟化特性使得隧道圍巖開(kāi)挖易發(fā)生冒頂 、塌方等事故。以應(yīng)變軟化特性本構(gòu)關(guān)系， 基于勢(shì)能原理，建立雙應(yīng)變軟化夾層組合下的折疊突變模型，推導(dǎo)出隧道圍巖突變失穩(wěn)判據(jù)；通過(guò) FLAC 3D 模擬軟件分析不同剪切模量下圍巖位移的變化規(guī)律。結(jié)果表明： 雙應(yīng)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?chē)鷰r體剪切模量差距增大，夾層部位出現(xiàn)位移局部增大現(xiàn)象；且剪切模量越小， 圍巖越容易突變失穩(wěn)；基于折疊突變理論建立的雙應(yīng)變軟弱夾層隧道圍巖失穩(wěn)判據(jù)是適用的，可以作為判別圍巖穩(wěn)定性的補(bǔ)充，研究成果可為今后類(lèi)似隧道工程設(shè)計(jì) 、施工提供指導(dǎo)借鑒作用。

關(guān)鍵詞：軟弱夾層 ；雙應(yīng)變軟化 ；圍巖失穩(wěn) ；折疊突變模型 ；失穩(wěn)判據(jù)

中圖分類(lèi)號(hào)：U25           

文獻(xiàn)標(biāo)志碼：A            

文章編號(hào)： 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(jiǎn)介：魏艷君  (1998—) ,  女 ，碩士研究生 ，研究方向：地質(zhì)災(zāi)害超前預(yù)報(bào)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(zhì)災(zāi)害超前預(yù)報(bào)及隧道地下工程。

收稿日期：2023 - 04 - 06