Evaluation of Modulus of Subgrade Reaction for Analysis of Deep Excavation

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研究生：	許秋慧 Vera - Amalia Santoso Hie
論文名稱：	Evaluation of Modulus of Subgrade Reaction for Analysis of Deep Excavation Evaluation of Modulus of Subgrade Reaction for Analysis of Deep Excavation
指導教授：	歐章煜 Chang-Yu Ou
口試委員:	謝佑明 Yo-Ming Hsieh 唐雨耕 Yu-Geng Tang
學位類別：	碩士 Master
系所名稱：	工程學院 - 營建工程系 Department of Civil and Construction Engineering
論文出版年：	2007
畢業學年度：	95
語文別：	英文
論文頁數：	160
中文關鍵詞：	beam on elastic foundation 、springs 、modulus of subgrade reaction 、anchored bulkhead 、free earth support 、clay 、soft clay 、medium clay 、stiff clay 、rigid wall 、flexible wall 、VEX 、Plaxis 、Rido 、TNEC
外文關鍵詞：	beam on elastic foundation, springs, modulus of subgrade reaction, anchored bulkhead, free earth support, clay, soft clay, medium clay, stiff clay, rigid wall, flexible wall, VEX, Plaxis, Rido, TNEC
相關次數：	點閱：223 下載：14
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Evaluations of the modulus of subgrade reaction have been carried out by Modified Ou and Tung’s Equation based on beam on elastic foundation method. The theoretical equation is incorporated in Versatile Excavation Analysis program. In order to verify the equation, Plaxis finite element tool could be used as benchmark in analysis studies. However, it needs to be continuously fully validated against reliable field measurement results before used. In order to be realistic in simulating the real condition, there is an establishment of lateral earth pressure in the back of the wall along the twice depth of a tension crack in the Modified Ou and Tung’s theory based on beam on elastic foundation.
A variation approach is employed to numerical problem for diaphragm wall embedded in clay soils using beam on an elastic foundation model. The Modified Ou and Tung’s Equation is validated against several hypothetical cases, such as linearly undrained shear strength to the depth, single, and two-layer of clay soil system with constant soil stiffness.
Furthermore, the comparison of Plaxis, Rido, and VEX results will found that VEX give it best performance in the free earth support condition of the wall in which the uniformly wall movement is produced. Otherwise, the modulus of subgrade reaction obtained from Modified Ou and Tung’s Equation will be no longer applicable, even just for single layer of clay soil. The behavior of rigid walls lay on three different soil classifications (soft clay, medium clay, and stiff clay) then will be performed to gain better understanding on these behaviors. In addition, the flexible wall in soft clay will also be considered due to its consistency in giving well perform in wall displacement.

ABSTRACT	ii
ACKNOWLEDGEMENTS	iii
CONTENTS	iv
LIST OF TABLES	vii
LIST OF FIGURES	viii
Chapter 1 INTRODUCTION	1
1. Background	1
2. Objectives and Scopes	2
3. Organization	3
Chapter 2 LITERATURE REVIEW	4
1. The Outgrowth of Beam on Elastic Foundation Method (BEM)	4
2. The Estimation of Coefficient of Subgrade Reaction	8
Chapter 3 THEORETICAL DERIVATIO OF MODULUS OF SUBGRADE REACTION	13
1. Introduction	13
2. Theoretical Derivation	13
2.1. Assumptions	13
2.2. Stress-Strain Behavior of the Soil in Front of the Wall	14
2.3. Stress-Strain Behavior of the Soil Below the Wall Bottom	15
2.4. Boundary Conditions and Solutions	17
2.5. Derivation of Coefficient of Subgrade Reaction	18
3. Miyoshi Method and Double-Side Springs Method	19
Chapter 4 METHODOLOGY	21
1. Plaxis v7.11	21
1.1. Introduction	21
1.2. Basic Procedure	21
1.3. Geometry Model	22
1.4. Diaphragm Wall, Cast Floor Slab, and Struts as Beam Elements	22
1.5. Soil Meshing	23
1.6. Interfaces	24
1.7. Standard Fixities	25
1.8. Water Weight	25
1.9. Initial Conditions	25
1.10.1. Soil Elements	26
1.10.2. Modelling Soil Behaviour	26
1.10.3. Type of Soil Behaviour (Material Type)	27
2. VEX	27
2.1. VEX Introduction	27
2.2. Water Pressure and Pore Pressure	28
2.3. Wall Properties	28
2.4. Excavation Site Properties	28
2.5. Soil Properties	29
3. Parameter Used in Research Study	31
3.1. Input Structural Properties	31
3.1.1. Diaphragm Wall Parameters	31
3.1.2. Floor Slab Parameters	31
3.1.3. Struts Parameters	32
3.2. Input Soil Properties	32
3.2.1. Soil Stiffness	32
3.2.2. Ko-Procedure	33
3.2.3. Distribution of Lateral Earth Pressure	34
Chapter 5 ANALYSIS RESULTS AND DISCUSSIONS	36
1. Taipei National Enterprising Center Building	36
1.1. General Information	36
1.2. Soil Conditions	36
1.3. Finite Element Model	37
1.4. Numerical Results	38
2. Sensitivity Studies of Modified Ou and Tung’s Equation	38
3. Establish the Earth Pressure in the Back of the Wall	39
4. Verification Using Hypothetical Cases	40
4.1. Linearly Undrained Shear Strength to the Depth	40
4.2. Constant Value of Undrained Shear Strength	42
4.2.1. One Layer of Clay Soil	42
4.2.2. Two Layers of Clay Soil	43
4.3. Anchored Bulkhead with Free Earth Support Model	44
4.3.1. Soft Clay	45
4.3.2. Medium Clay	48
4.3.3. Stiff Clay	49
5. Parametric Studies	50
Chapter 6 CONCLUSIONS AND FUTURE WORK	52
1. Conclusions	52
2. Further Research	53
REFERENCES	54

                                

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