通過對(duì)相關(guān)文獻(xiàn)的調(diào)查研究,可以發(fā)現(xiàn)目前樁荷載對(duì)既有隧道的影響沒有得到足夠的重視。為保證隧道結(jié)構(gòu)的安全可靠,研究不同土體中樁荷載對(duì)既有隧道結(jié)構(gòu)力學(xué)響應(yīng)的影響規(guī)律就顯得十分重要。因此,本文采用有限元分析軟件Plaxis,選取紅土和上海、博姆、曼谷的典型粘土地層,分析了不同地層臨近既有樁基對(duì)隧道結(jié)構(gòu)力學(xué)響應(yīng)的影響規(guī)律,進(jìn)一步闡述了樁和隧道之間的相互作用機(jī)理。首先,本文對(duì)比分析了紅土與其它粘土地層中隧道的彎矩、軸力、剪力及變形,揭示了紅土地層對(duì)隧道結(jié)構(gòu)的特殊影響。結(jié)果表明,與其它地層相比,紅土地層中隧道彎矩和剪力明顯較大,軸力則無明顯區(qū)別,隧道變形有大有小。其次,本文研究了用于隧道襯砌上的樁承載效應(yīng)的二維平面應(yīng)變模型,以確定二維平面應(yīng)變模型是否能較為接近的模擬三維模型的力學(xué)狀態(tài),并且分析何種情況下三維模型能夠簡(jiǎn)化為二維平面應(yīng)變模型。結(jié)果表明二維模型高估了樁的荷載效應(yīng),尤其在襯砌的位移方面。因此,二維模型應(yīng)謹(jǐn)慎使用,且其結(jié)果只能作為一個(gè)大概值。此外,本文還研究了樁荷載在不同地層中對(duì)隧道力學(xué)響應(yīng)的影響,主要分析因素為土體剛度、靜止土壓力系數(shù)和樁與承臺(tái)連接情況。結(jié)果表明:樁荷載效應(yīng)較大程度上取決于土... 

【文章頁(yè)數(shù)】：107 頁(yè)

【學(xué)位級(jí)別】：碩士

【文章目錄】：
ACKNOWLEDGMENTS
摘要
ABSTARCT
LIST OF SYMBOLS
1 INTRODUCTION
    1.1 Problem Statement
    1.2 Scope
    1.3 Thesis Outline and Workflow
2 LITERATURE REVIEW
    2.1 Pile Tunnel Interaction Problem
    2.2 Lateritic Soils
        2.2.1 Mineral Composition, Physical and Mechanical Characteristic of Lateritic Soils
        2.2.2 Engineering Characteristics of Lateritic Soils
        2.2.3 Constitutive Models and Features for Lateritic Soils
        2.2.4 The Mohr- Coulomb's Model
        2.2.5 The Hardening Soil Model
        2.2.6 Response Characteristics of Lateritic Soils to Tunnelling
    2.3 Shanghai soft clay, Bangkok soft and stiff clays, Boom clay and London clay
    2.4 Modelling Approach of Tunnel Problems
        2.4.1 Modelling of Pile Group Effect on Tunnels
        2.4.2 Embedded Piles in Plaxis 3D
        2.4.3 Embedded Pile Row Element in Plaxis 2D
        2.4.4 Induced Structural Forces in Tunnel Lining due to Pile Loads
3 3D COMPARATIVE ANALYSES OF FORCES AND DISPLACEMENTS OF TUNNEL LININGS IN CLAYS
    3.1 Selection of Appropriate Soil Constitutive Models
    3.2 Comparing Lining Force for Tunnels in Lateritic soil, Shanghai soft clay, Bangkok softclay, Bangkok stiff clay, Boom clay and London clay
    3.3 Modelling Approach
    3.4 3D Model for Step-by-Step Validation
    3.5 Parametric Analyses
    3.6 Results
        3.6.1 Ground Surface Settlements
        3.6.2 Lining Forces and Displacements
        3.6.3 Influence of Soil Parameter on the Mechanical Response of the Tunnel Lining inLateritic Soils
4 COMPARING THE EFFECTS OF PILE GROUP LOADS ON TUNNEL LINING USING 2D AND 3DMODELS
    4.1 Finite Element Analyses
        4.1.1 Determining Load Capacity of Pile
        4.1.2 Finite Element Model for 2D Plain Strain Analyses
        4.1.3 Validity of the 2D Plain Strain Model
        4.1.4 Finite Element Model for 3D Analyses
        4.1.5 Constitutive Model and Material Properties for 2D Model
        4.1.6 Constitutive Model and Material Properties for 3D Model
        4.1.7 Numerical Simulation of the Pile-Tunnel Interaction
    4.2 Results
5 EFFECTS OF PILE GROUP LOADS ON TUNNEL LINING IN SOFT AND STIFF CLAYS USING A 3DMODEL
    5.1 Model Geometry and Boundary Conditions
    5.2 Material Parameters and Constitutive Models
    5.3 Determination of Allowable Design Load of the Piles within the Various Clays
    5.4 Numerical Analyses Procedure for the Studies
    5.5 Model Validation
    5.6 Results
        5.6.1 Comparing Pile Loads Effects on Tunnel Lining in Lateritic Soil, Bangkok Stiff Clayand Bangkok Soft Clay
        5.6.2 Accessing the Influence of Soil Stiffness Modulus(E_(50)~(ref)) and At -Rest EarthPressure Coefficient (Ko) on Pile Group Load Effects on Tunnel Lining
        5.6.3 Influence of Pile Head Connection on Pile Group Load Effects on Tunnel Lining
        5.6.4 Influence of Pile length on the Pile Group Load Effects on Tunnel Lining
6 CONCLUSIONS
REFERENCES
A FORM


【參考文獻(xiàn)】：
期刊論文
[1]重塑上海軟土的壓縮和剪切變形特性試驗(yàn)研究[J]. 孫德安,陳波,周科.  巖土力學(xué). 2010(05)
[2]橫觀各向同性土對(duì)剪切帶形成的影響[J]. 張啟輝,趙錫宏.  同濟(jì)大學(xué)學(xué)報(bào)(自然科學(xué)版). 2001(05)
[3]上海淺層地基土的前期固結(jié)壓力及有關(guān)壓縮性參數(shù)的試驗(yàn)研究[J]. 魏道垛,胡中雄.  巖土工程學(xué)報(bào). 1980(04)



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