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高地应力围岩挤压性大变形分析及数值模拟(鄢建华)

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_,W2} y~JjQLx2n0地应力围岩挤压性大变形分析及数值模拟

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【作者】鄢建华 【导师】洪晓林; 汤雷水利论文-Q&t,mut~&P']dw
【作者基本信息】南京水利科学研究院,水工结构工程,2004年,硕士

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~4f eK+UA0【中文摘要】 高地应力围岩挤压性大变形是深埋地下工程最具特色的地质问题之一,主要发生在高地应力区结构面较发育的工程岩体中。目前对此问题的研究主要依靠归纳、总结及工程类比等方法,理论上的研究较少。在实际工程建设中,不论设计还是施工都没有一套可靠的解决办法,随着我国地下工程建设向深部发展,发生挤压性大变形的工程日益增多,研究高地应力挤压性围岩工程特性及变形破坏机制,寻求有效的工程对策,具有重大意义。 论文首先广泛调研了有关深埋隧洞围岩挤压性大变形的研究资料,综述了有关高地应力场、围岩大变形和裂隙岩体分析模型等方面的研究现状,总结了挤压性围岩大变形的基本特征,揭示了围岩大变形的形成和发展过程,分析了变形的因素和机理。依据围岩的挤压性变形特征,设计开展了平面应变相似试验,模拟了挤压性围岩变形过程,在试验的基础上,基于weibull分布建立了岩石损伤演化方程并由此建立了能够较好模拟岩石软化力学行为的模型。应用非线性大变形有限元方法和所建立的各种软化模型相结合,对高地应力挤压性围岩大变形进行了深入的数值分析,再现了挤压性围岩大变形的形成和发展过程,分析了变形发生的基本条件及主控因素,指出在高地应力围岩挤压性大变...更多形分析中考虑岩石峰后力学行为的必要性,并通过对比不同软化模型的分析结果,优选出了最适合于模拟本文所研究的节理化挤压性围岩大变形的模型。最后,以家竹箐隧道为实例,应用非线性大变形有限元方法与优选出的软化模型相结合,对不同施工方案进行了仿真分析,再现了不同施工方案的隧道围岩大变形形成和发展的过程,同时应用上述数值方法模拟分析对比了各种支护方法对维护围岩稳定的效果,探讨了在深部开挖条件下,高地应力挤压性围岩的力学响应、洞室的稳定性及工程对策等问题,为深埋工程的建设提供了参考和应用价值。  还原

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y-I j0o0N`(L0【英文摘要】 The large deformation of surrounding rock mass squeezed by high ground stress is the most popular problem in deeply-lying underground works, and it often occurres in engineering rock mass with great discontinuities, the systemic theoretic study on the problem is imperfect. The induction, summarization or engineering analogical method is usually used to solve the problem, there is no reliable one. With the development of underground construction, more and more underground engineering meet the trouble of this problem. In order to search effectual engineering countermeasures, it is very necessary to study the engineering characteristics and mechanism of deformation and failure of surrounding rock mass squeezed by high ground stress.Firstly, researchs on large deformation of surrounding rock mass squeezed by high ground stress are reviewed. Current study on high stress area, large deformation and stability analysis of the fractured rock are summarized. Character and process of large squeez...更多ed deformation are generalized. Secondly, based on the similarity test designed to imitate the process of large squeezed deformation, the damage evolution of rock is described with the weibull probability distribution, and then a strain-softening model is developed which is more suit to simulate softening behavior of rock. Large deformation nonlinear finite element method and strain-softening models are used to do the emulational calculation on surrounding rock mass squeezed by high ground stress, the formation and development of squeezing large deformation is represented, and the basic condition, controlling factors and mechanism of squeezing large deformation also are investigated. The result of analysis by theoretical and numerical method demonstrates it important to consider rock softening behavior during solving the large deformation problem, and the most suitable one of the several strain-softening model presented in thesis is selected. Finally, following the example of jiazhuqing tunnel, formation and development of squeezing large deformation of surrounding rock corrsponding to two construction schemes are reappeared by the large deformation nonlinear finite element method and the optimum strain-softening model selected above and the effect of several supporting methods is compared, the mechanical response, dynamic characteristic, stability and engineering countermeasures of surrounding rock mass squeezed by high ground stress in deeply-lying underground works are also discussed.  还原水利论文$Q,? |7I` TVw-Pk

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【中文关键词】 高地应力; 挤压性围岩; 变形破坏机制; 相似试验; 软化模型; 非线性有限元; 力学响应; 工程对策水利论文3gH }@f{8M
【英文关键词】 high ground stress; squeezing surrounding rock mass; mechanism of deformation and failure; similarity test; strain-softening model; nonlinear finite element method; mechanical response; engineering countermeasures
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TAG: 数值模拟 鄢建华 围岩 地应力
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