含水平弱夹层岩体界面应力及破坏形式
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摘要
针对岩体工程中的弱夹层对工程结构的整体稳定性和支护结构安全性有不利影响的问题,认为结构强度和破坏形式与围岩和夹层各自的力学特性及二者间结合界面的应力状态有关.假设含弱夹层岩体为横观各向同性弹性复合岩体(不针对具体岩石种类),按照叠加原理,推导出夹层水平时复合岩体界面处应力表达式,并通过数值仿真对层状岩体应力分布进行定性验证,在此基础上进行强度分析,并给出含弱夹层岩体的破坏形式和破坏机理,对任意两种变形能力有差别的岩石组成的复合层状岩体,尤其弾脆性岩体适用.
Regarding the adverse effects on whole stability and safety of supporting structure of engineering structure caused by weak interlayer in rock mass, strength and failure modes of structure are thought to be related with mechanical properties of surrounding rock and interlayer and stress state of bonding interface between surrounding rock and interlayer. Rock mass with weak interlayer is assumed as transversely isotropic elastic composite rock mass, which is not directed against specific rock types. According to the superposition principle, the interface stress expressions of composite rock mass with horizontal interlayer are deduced, and the stress distribution of layered rock mass is qualitatively validated by numerical simulation. Strength analysis is carried out based on it, and the failure modes and failure mechanism of weak interlayer rock are drawn. The above is valid for composite layered rock mass consist of two rocks with different deformation capability, especially for the elastic brittle rock mass.
Regarding the adverse effects on whole stability and safety of supporting structure of engineering structure caused by weak interlayer in rock mass, strength and failure modes of structure are thought to be related with mechanical properties of surrounding rock and interlayer and stress state of bonding interface between surrounding rock and interlayer. Rock mass with weak interlayer is assumed as transversely isotropic elastic composite rock mass, which is not directed against specific rock types. According to the superposition principle, the interface stress expressions of composite rock mass with horizontal interlayer are deduced, and the stress distribution of layered rock mass is qualitatively validated by numerical simulation. Strength analysis is carried out based on it, and the failure modes and failure mechanism of weak interlayer rock are drawn. The above is valid for composite layered rock mass consist of two rocks with different deformation capability, especially for the elastic brittle rock mass.
引文
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[11]唐良琴,聂德新,刘东燕,等.软弱夹层强度参数的主要影响因素分析[J].工程地质学报,2012,20(2):289-295.Tang Liangqin,Nie Dexin,Liu Dongyan,et al.Analysis of main factors influencing strength parameters of soft intercalation[J].Journal of Engineering Geology,2012,20(2):289-295.
[12]王益壮,李晓昭,章杨松,等.程晋源.含厚层软弱夹层硬质围岩的变形破坏特性[J].防灾减灾工程学报,2011,31(4):441-448.Wang Yizhuang,Li Xiaozhao,Zhang Yangsong,et al.Deformation and damage characteristics of hard rock mass with thick weak interlayer[J].Journal of Disaster Prevention and Mitigation Engineering,2011,31(4):441-448.
[13]徐素国,梁卫国,莫江,等.软弱泥岩夹层对层状盐岩体的力学特性影响研究[J].地下空间与工程学报,2009,5(5):878-883.Xu Suguo,Liang Weiguo,Mo Jiang,et al.Influence of weak mud stone intercalated layer on mechanical properities of laminated salt rock[J].Chinese Journal of Underground Space and Engineering,2009,5(5):878-883.
[14]蔡美峰,何满潮,刘东燕.岩石力学与工程[M].北京:科学出版社,2002.Cai Meifeng,He Manchao,Liu Dongyan.Rock mechanics and engineering[M].Beijing:Science Publishing Company,2002.
[15]沈观林,胡更开,刘彬.复合材料力学[M].北京:清华大学出版社,2013.Shen Guanlin,Hu Gengkai,Liu Bin.Mechanics of Composite Material[M].Beijing:Tsinghua University Press,2013.
[2]周维垣.高等岩石力学[M].北京:水利电力出版社,1993.Zhou Weiyuan.Higher Rock Mechanics[M].Beijing:Water Conservancy and Power Press,1993.
[3]刘立,梁伟,李月,等.岩体层面力学特性对层状复合岩体的影响[J].采矿与安全工程学报,2006,23(2):187-191.Liu Li,Liang Wei,Li Yue,et al.Influence of mechanical characteristic of bedding surface on stratified composite rock mass[J].Journal of Mining and Safety Engineering,2006,23(2):187-191.
[4]鲜学福,谭学术.层状岩体破坏机理[M].重庆:重庆大学出版社,1989.Xian Xuefu,Tan Xueshu.Failure Mechanism of Stratified Rock Mass[M].Chongqing:Chongqing University Press,1989
[5]杨春和,李银平,陈锋.层状盐岩力学理论与工程[M].北京:科学出版社,2009.Yang Chunhe,Li Yinping,Chenfeng.Mechanics theory and engineering of bedded salt rock[M].Beijing:Science Publishing Company,2009.
[6]Tziallas GP,Saroglou H,Tsiambaos G.Determination of mechanical properties of flysch using laboratory methods[J].Engineering Geology,2013(166):81-89.
[7]张顶立,王悦汉,曲天智.夹层对层状岩体稳定性的影响分析[J].岩石力学与工程学报,2000,19(2):140-144.Zhang Dingli,Wang Yuehan,Qu Tianzhi.Influence analysis of inter band on stability of stratified rock mass.Rock Mechanics and Engineering[J].2009,19(2):140-144.
[8]姜德义,任涛,陈结,等.含软弱夹层盐岩型盐力学特性试验研究[J].岩石力学与工程学报,2012,31(9):1 797-1 803.Jiang Deyi,Ren Tao,Chen Jie,et al.Experimental study of mechanical characteristics of molded salt rock with weak interlayer[J].Chinese Journal of Rock Mechanics and Engineering,2012,31(9):1 797-1 803.
[9]王永岩,李媛.软岩流变模型实验相似准则的推演及应用[J].辽宁工程技术大学学报:自然科学版,2012,30(3):354-357.Wang Yongyan,Li Yuan.Deduction and application of similarity criteria in soft rock rheological model experiment[J].Journal of Liaoning Technical University:Natural Science,2012,30(3):354-357.
[10]徐素国,梁卫国,赵阳升.含盐分泥岩溶浸弱化力学特性[J].辽宁工程技术大学学报:自然科学版,2010,29(3):416-419.Xu Suguo,Liang Weiguo,Zhao Yangsheng.Mechanical property of dipping mudstone with salt[J].Journal of Liaoning Technical University Natural Science,2010,29(3):416-419.
[11]唐良琴,聂德新,刘东燕,等.软弱夹层强度参数的主要影响因素分析[J].工程地质学报,2012,20(2):289-295.Tang Liangqin,Nie Dexin,Liu Dongyan,et al.Analysis of main factors influencing strength parameters of soft intercalation[J].Journal of Engineering Geology,2012,20(2):289-295.
[12]王益壮,李晓昭,章杨松,等.程晋源.含厚层软弱夹层硬质围岩的变形破坏特性[J].防灾减灾工程学报,2011,31(4):441-448.Wang Yizhuang,Li Xiaozhao,Zhang Yangsong,et al.Deformation and damage characteristics of hard rock mass with thick weak interlayer[J].Journal of Disaster Prevention and Mitigation Engineering,2011,31(4):441-448.
[13]徐素国,梁卫国,莫江,等.软弱泥岩夹层对层状盐岩体的力学特性影响研究[J].地下空间与工程学报,2009,5(5):878-883.Xu Suguo,Liang Weiguo,Mo Jiang,et al.Influence of weak mud stone intercalated layer on mechanical properities of laminated salt rock[J].Chinese Journal of Underground Space and Engineering,2009,5(5):878-883.
[14]蔡美峰,何满潮,刘东燕.岩石力学与工程[M].北京:科学出版社,2002.Cai Meifeng,He Manchao,Liu Dongyan.Rock mechanics and engineering[M].Beijing:Science Publishing Company,2002.
[15]沈观林,胡更开,刘彬.复合材料力学[M].北京:清华大学出版社,2013.Shen Guanlin,Hu Gengkai,Liu Bin.Mechanics of Composite Material[M].Beijing:Tsinghua University Press,2013.