A New Method to Design Reinforcements in Reinforced Earth Slopes｜國立臺灣科技大學博碩士論文系統

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研究生：	阮明德 NGUYEN - MINH DUC
論文名稱：	A New Method to Design Reinforcements in Reinforced Earth Slopes A New Method to Design Reinforcements in Reinforced Earth Slopes
指導教授：	李咸亨 Hsien-heng Lee
口試委員:	陳堯中 Yao-chung Chen 周南山 Nan-shan Chou
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：	2009
畢業學年度：	97
語文別：	英文
論文頁數：	154
外文關鍵詞：	Reinforced earth slope, ‘PCSTABL6’, anisotropic apparent cohesion theory, tension strength, reinforcement calculation
相關次數：	點閱：218 下載：2
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A new approach for calculating tension strength of reinforcement in reinforced earth slopes is presented. Based on the theory of anisotropic apparent cohesion, the essential ideal of the approach is to convert the effective of reinforcement into the additional cohesion of the reinforced soil. From the internal stability analysis of reinforced earth slope, the value of cohesion need to be added to strengthen the slope is estimated and then the tension strength of reinforcement is determined accordingly. By using computer program analysis (‘PCSTABL6’) the obtained results are conveniently presented in the form of design charts. Both of tension strength of reinforcement in designing reinforced earth slope or factor of safety of the real design of slope can be determined utilizing these charts. These charts are applicable to granular backfills, the existence of porewater pressure and the slope angle of lower than 75 degree. The results are also compared to other researcher’s results and discover the favorable range of using the new method.

CHAPTER 1	INTRODUCTION	1
1	Introduction	1
2	Research objectives	2
3	Outline of thesis	2
CHAPTER 2	LITERATURE REVIEW	3
1	Introduction	3
2	Reinforced soil slope system (FHWA-SA-96-071guidelines [7])	4
2.1	Terminology	4
2.2	Applications	4
2.3	Advantages and disadvantages	6
2.3.1	Advantages of Reinforced Soil Slopes	6
2.3.2	Disadvantages	7
2.4	Description of RSS system	8
2.4.1	Reinforcement Geometry	8
2.4.2	Reinforcement Material	8
2.4.3	Reinforcement Extensibility	8
2.4.4	Facing system	9
2.4.5	Reinforcement Types	9
2.4.6	Reinforced Backfill Materials	9
3	Mechanism and concepts of reinforced soil	10
3.1	Failure type of reinforced earth	10
3.1.1	Slipping bond failure	10
3.1.2	Tensile reinforcement failure	11
3.2	The anisotropic apparent cohesion concept	11
3.2.1	Laboratoire Central des Ponts et Chauss&eacute;es (LCPC) test result	11
3.2.2	The LCPC cohesion theory applied to sandy soil	12
3.2.3	The New South Wales (NSW) theory	13
4	The stability of slope, calculation method	18
4.1	Failure modes of a slope	18
4.2	Definition of the factor of safety	19
4.3	Spencer’s stability chart [20] – effect of porewater pressure	21
4.3.1	Representation of pore water pressure information	21
4.3.2	Spencer’s stability charts [20]	22
5	Design procedure of RSS (according to FHWA-SA-96-071 [7])	24
5.1	Reinforcement calculation method based on FHWA-SA-96-071 [7]	25
5.2	Schmertmann’s chart [23] to calculate reinforcement tension	26
5.2.1	Class of problems	26
5.2.2	Models of method	26
5.2.3	Assumption of method	27
5.2.4	Total reinforcement tension force calculation	27
5.2.5	Reinforcement lengths	28
5.3	Jewell’s chart method (1984) [12]	28
CHAPTER 3	STUDY DESIGN AND METHODOLOGY	31
1	Introduction	31
2	The development of a new reinforcement calculation method in Reinforced Soil Slope (RSS)	31
2.1	Ideal of method	31
2.2	The development of a new calculation reinforcement method for RSS	32
2.2.1	Application of anisotropic apparent cohesion theory for RSS	32
2.2.2	The validation of utilizing anisotropic apparent cohesion in slope stability analysis	34
2.2.3	Estimating anisotropic apparent cohesion, c* by slope stability analysis	35
3	The applications of the new calculation reinforcement method, procedure publication, method assumption and limitations	37
3.1	Procedure of calculating reinforcement in Reinforced Soil Slope, and the limiting assumption of method	37
3.2	Procedure of examine the stability of Reinforced Soil Slope	38
3.2.1	Calculation procedure	38
3.2.2	Limiting assumptions	38
3.3	Calculation reinforcement method based on a new design chart for RSS	39
4	Calculation example	40
4.1	Calculation example1: Reinforcement calculation for RSS	40
4.1.1	Problem	40
4.1.2	Solution of using the new method of calculation reinforcement	40
4.1.3	Find the tensile force based on the chart solution (after Schmertmann, et al., 1987)	42
4.1.4	Comparison and conclusion	43
CHAPTER 4	RESULTS & FINDINGS	44
1	Introduction of analysis	44
2	Method, model and the range value of parameters utilized in the calculation analysis	44
2.1	Method and model of calculation	44
2.1.1	Slope geometry	45
2.1.2	Input parameters of soils	45
2.1.3	Method of searching and calculating critical failure surface	45
2.2	The range value of parameters utilized in the calculation analysis	46
3	The relationship between parameters of a slope	47
3.1	The equivalent height of slope	47
3.1.1	Definition	47
3.1.2	Estimating deviation duce to the assumption equivalent height	47
3.1.3	The results of analysis	48
3.2	Relationship between modified heights of slope H’ and apparent anisotropic cohesion c*	49
3.3	Relationship between unit weight of backfill soil and apparent anisotropic cohesion c*	50
3.4	The relationship between c* and the product H’	55
4	The establishment of coefficient reinforcement chart	56
4.1	Equation of calculating tensile strength of reinforcement	56
4.2	Plotting the coefficient reinforcement charts	57
5	Method to calculate reinforcement for RSS with sandy soil as the back fills using the coefficient reinforcement charts	58
5.1	Procedure of calculating the total tension strength of reinforcement utilized the coefficient reinforcement charts	58
5.2	Procedure of verifying a design of reinforcement utilized the coefficient reinforcement charts	58
6	Comparison the results of new design chart to other researches	59
7	Case histories, the applications of the new design charts	61
7.1	Case history 1	61
7.2	Case history 2	63
7.3	Case history 3	67
8	Remarks and conclusion	70
CHAPTER 5	CONCLUSIONS AND SUGGESTIONS	72
1	Conclusions	72
2	Suggestions	73
References………………………………………………………………………………..74
                                

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