围岩稳定性论文：高地应力公路隧道施工围岩稳定性研究

【中文摘要】基于围岩稳定性理论，详细分析了影响高地应力区公路隧道围岩稳定性的因素，进而对高地应力区公路隧道围岩稳定性主要影响因素进行量化分析，并针对高地应力隧道施工引起围岩应力集中与变形过大问题采取合理的卸压支护措施进行数值模拟研究，为高地应力区公路隧道设计与施工提供科学的理论依据。本文研究的主要成果如下：1.从高地应力定义、单元类型、网格划分、边界条件、围岩破坏模式、模型参数等方面入手，建立高地应力公路隧道数值模型，对数值模型进行验证，并提出本文计算流程。2.依据围岩稳定性理论，通过数值模拟方法，针对围岩的强度、隧道埋深、跨度、侧压力系数、断面形式、高跨比等因素在高地应力隧道施工过程中对围岩稳定性影响有所不同，建立数值分析模型，对围岩稳定性的影响因素进行了分析。得出围岩强度、埋深、跨度是影响高地应力隧道围岩应力与变形的主要因素，同时侧向压力系数、高跨比对高地应力隧道围岩应力与变形也具有一定的影响，断面形式的变化对围岩应力与变形影响较小。3.通过数值模拟，对高地应力公路隧道施工影响围岩稳定性的主要因素进行量化分析，得到了围岩应力与变形的影响规律及量化公式，并用数值模拟结果对量化公式进行比较，分析可以应用于高地应力隧道施工估算最大围岩应力与变形。4.针对隧道施工后围岩应力集中与变形过大，采取卸压槽法、钻孔卸压法、衬砌选择、锚杆布

置等卸压支护措施。通过数值模拟分析，效果明显，为实际高地应力隧道工程设计与施工提供科学的理论依据。

【英文摘要】Based on the theory of the stability of surrounding rock, the paper had analyzeddetailedly the factors of influencing high ground stress surrounding rock’s stabilityand then had a quantitative analysis in allusion to Several larger factors of influencinghigh ground stress surrounding rock’s stability and took reasonable

dischargingpressure support measures according to the problems of high ground stressconcentration and large deformation in surrounding rock tunnel construction, thatprovided certain theoretical basis for high geostress tunnel construction. This paperstudies the main work was as follows:1. From the high geostress definition, types, grid partition, unit boundary conditions,wall rock failure mode, model parameter and teaching,a high geostress highwaytunnel numerical model was established , the numerical model was validated, and itput forward the calculation procedure in this paper.2.According to the stability of surrounding rock of theory and through numericalsimulation method ,it set up a large amount of numerical model to analyze affect ofsurrounding rock stress and

deformation in the process of tunnel excavation and

itcontrasted that the influence weights of various factors on account of parameters ofsurrounding rock, tunnel buried depth, tunnel hole diameter and the lateral pressurecoefficient, tunnel profile form as well as depth-span ratio six factors change in theprocess of the surrounding rock tunnel construction to lead to the deformation andstress of the surrounding rock were different forms. It draw that the strength of surrounding rock, buried depth, span were the main factor on high ground stresssurrounding rock stress and deformation and lateral pressure coefficient, high crossthan also had a certain effect for high geostress surrounding rock stress anddeformation, the form changes of the section of surrounding rock was smallinfluence on stress and

deformation.3.Through numerical simulation, it quantitatively analysis the main factors of theinfluence on the stability of surrounding rock In the high geostress highway

tunnelconstruction process.It obtained quantitative formula and the influence law of thesurrounding rock stress and deformation, and numerical simulation results of thequantized formulas for comparison and analysis could be applied to high

geostresstunnel construction surrounding rock stress and deformation of the largest estimate.4. For tunnel construction surrounding rock stress concentration and deformation aftertoo large, took discharging pressure trough method, borehole discharge pressure,lining selection, such as anchor arrangement discharging pressure supportmeasures.through numerical simulation, the effect was obvious, it provide thescientific theory for actual high geostress tunnel engineering design and construction.

【关键词】围岩稳定性 高地应力 变形 因素 规律 卸压 支护 【英文关键词】the stability of surrounding rock High geostress Deformation Factors The rule Discharging pressure support

【目录】高地应力公路隧道施工围岩稳定性研究摘要5-6

ABSTRACT6-7

第一章 绪论10-19

1.1 课题研究的目的

和意义10现状10-1313-1516-17

1.2 国内外研究现状10-151.2.1 围岩稳定性发展

1.2.2 高地应力隧道卸压支护措施研究现状

1.4 研究方法与技术路线

1.5 研究

1.3 研究的主要内容15-161.4.1 研究方法16-17

1.4.2 技术路线17

的重点和难点17-1919-28

第二章 高地应力公路隧道数值模型建立

2.2 单元类型、网格划分及

2.1 高地应力的定义19-20

边界条件20-21和网格的选取2121-23

2.2.1 单元类型的选取20-212.2.3 边界条件21

2.2.2 模型维度

2.3 围岩破坏模式选取

2.6

2.4 模型验证参数选取232.5 模型验证23-26

计算流程26-272.7 本章小结27-28第三章 高地应力公路隧

3.2 影响围岩3.2.2 隧道埋深

道施工围岩稳定性量化分析28-55稳定性因素分析28-4033-3435-36

3.1 引言28

3.2.1 围岩强度28-33

3.2.3 隧道跨度34-353.2.4 侧向压力系数

3.2.6 高跨比38-40

3.3

3.2.5 隧道断面形式36-38

围岩稳定性量化分析40-533.3.1 数值方案设计40-433.3.2

隧道埋深 H 影响量化分析43-44析44-47

3.3.3 隧道跨度 D 影响量化分

3.3.5 侧向压力

3.3.4 围岩强度影响量化分析47-49

系数影响量化分析49-5252-53

3.3.6 高跨比影响量化分析

第四章 高地应力公路隧道卸压支

4.2 卸压支护方案设

3.4 本章小结53-55

护措施的数值分析55-89计56-57

4.1 引言55-56

4.2.1 卸压支护措施选取564.2.2 围岩参数与地层4.3.1 卸压措施4.3.3 钻孔卸压法数值4.4.1 支护措施选取

结论与致谢

条件选取56-5757-58

4.3 卸压数值模拟57-80

4.3.2 卸压槽法数值模拟58-74

4.4 支护数值模拟80-87

模拟74-8080-81

4.4.2 支护模拟81-87

结论89-90

4.5 本章小结87-89

展望89-9195-96

展望90-91参考文献91-95

附录96