| 研究生: |
鄭景綸 Cheng, Ching-lun |
|---|---|
| 論文名稱: |
地工合成物加勁邊坡之承載力分析 Analysis on the ultimate bearing capacity of geosynthetic-reinforced slopes |
| 指導教授: |
黃景川
Huang, Ching-chuan |
| 學位類別: |
碩士 Master |
| 系所名稱: |
工學院 - 土木工程學系 Department of Civil Engineering |
| 論文出版年: | 2007 |
| 畢業學年度: | 95 |
| 語文別: | 中文 |
| 論文頁數: | 93 |
| 中文關鍵詞: | 承載力分析 |
| 外文關鍵詞: | ultimate bearing capacity |
| 相關次數: | 點閱:145 下載:2 |
| 分享至: |
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摘 要
本研究以極限平衡為基礎,建立多楔形分析法,並對於分析方法
進行初步之正確性檢驗。探討加勁土壤回包為面版之加勁擋土結構物,
對於整體邊坡穩定性的影響,進行相關之參數分析,如土壤摩擦角、加
勁材強度與長度以及各介面摩擦角等,並參照Matsushima et al.(2007)
所進行一系列邊坡加載試驗,進行模擬分析。
分析結果,於純參數分析中,影響整體邊坡穩定性以土壤摩擦角
(φs)最為顯著,其次為土楔間介面摩擦角(φBF),然而加勁材張力強度與
埋設長度、土壤與加勁材介面摩擦角(φbag)、牆背摩擦角(φFW)以及面板-
加勁土壤回包堆疊傾斜等,皆對於整體穩定性有提升的效果。
本研究對於Matsushima et al.(2007)所進行一系列邊坡加載試
驗模擬分析,結果顯示,土壤發揮摩擦角介於78~86﹪平面應變尖峰摩
擦角(φp)範圍內,提供設計時參考之初步依據,並與Huang and
Kang(2006)、Huang and Tatsuoka(1994)提出自然邊坡承載力進行比較。
ABSTRACT
A limit-equilibrium-based stability analysis method is developed to simulate the
stability of geosynthetic-reinforced sand slopes stabilized with soil bags stacked on the
slope face as well as unreinforced sand slope. The stability of unreinforced and
reinforced sand slopes when loaded with a rigid strip footing placed on the slope crest
were evaluated by physical model tests in the laboratory. The physical model tests were
analyzed by the proposed analysis method. The results of the analysis are in good
agreement with the physical model test results. A parametric study performed using the
proposed method revealed that the effects of the inter-wedge friction angle, φBF, and
internal friction angle of the backfill soil, φs, on the slope stability of the unreinforced and
reinforced sand slopes are significant. The ultimate footing loads observed in five
physical model tests on reinforced and unreinforced slopes can be simulated by the
proposed analysis method (assuming isotropic perfectly plastic stress-strain behaviour of
backfill) when using a single ‘operational’ friction angle (φop) that is 82 to 86 % of the
peak internal friction angle obtained from conventional drained plane strain compression
tests (namely, φp) under low pressure levels as in the model tests. This ratio of φop / φp is
consistent with the one found in the stability analyses of reinforced and unreinforced
gentle sand slopes reported by Huang and Tatsuoka (1994). It is considered that the fact
that the φop value is lower than the φp value is due to combined effects of stress
level-dependency, inherent anisotropy and progressive failure on the local friction angles
mobilized along the potential failure surface at the moment when the footing load applied
to the unreinforced and reinforced sand slopes becomes the peak.
參 考 文 獻
1. Austin, R.A. and Martin, C. (1996) “The connection strength of masonary
block faced retaining walls” Proceedings of the International Symposium
on Earth Reinforcement, Fukuoka, Vol. 1, pp. 13-17.
2. Bathurst, R.J. and Hatami, K. (1998) “Seismic response analysis of a
geosynthetic-reinforced soil retaining wall” Geosynthetic International,
Vol. 5, Nos. 1-2, pp. 127-166
3. Bathurst, R.J., Blatz, J.A. and Burger, M.H. (2003) “Performance of
instrumented large-scale unreinforced and reinforced embankments loaded
by a strip footing to failure” Canadian Geotechnical Journal, Vol. 40, pp.
1067-1083.
4. Bathurst, R.J., Vlachopoulos, N., Walters, D.L., Burgess, P.G. and Allen,
T.M. (2006) “The influence of facing stiffness on the performance of two
geosynthetic reinforced soil retaining walls” Canadian Geotechnical
Journal, Vol. 43, pp. 1225-1237.
5. Blatz, J.A. and Bathurst, R.J. (2003) “Limit equilibrium analysis of
large-scale reinforced and unreinforced embankments loaded by a strip
footing” Canadian Geotechnical Journal, Vol. 40, pp. 1084-1092.
6. Graham, J., Andrew, M. and Shield, D. H. (1988) “Stress characteristics
for shallow footings in cohesionless slopes” Canadian Geotechnical
Journal, Vol. 25, pp. 238-249.
7. Huang, C.C., and Tatsuoka, F. (1994) “Stability analysis for footings on
reinforced sand slopes”, Soils and Foundations, Vol.34, No.3, pp.21-37.
- 90 -
8. Huang, C.C., Tatsuoka, F., and Sato, Y. (1994) “Failure mechanisms of
reinforced sand slopes loaded with a footing”, Soils and Foundations,
Vol.34, No.2, pp27-40.
9. Huang, C.C. and Wang, W.C. (2005a) “Seismic displacement of a
geosynthetic-reinforced wall in the 1995 Hyogo-Ken Nambu earthquake”,
Soils and Foundation, Vol. 45, No. 5, pp.1-10.
10. Huang, C.C. and Wang, W.C. (2005b) “Seismic displacement charts for
the performance-based assessment of reinforced soil walls”, Geosynthetics
International, Vol. 12, No. 4, pp. 176-190.
11. Huang, C.C. and Wu, S.H. (2006) “Simplified approach for assessing
seismic displacements of soil-retaining walls- (I) Geosynthetics-reinforced
modular blocks walls“ Geosynthetics International, Vol. 13, No. 6, pp.
219-233.
12. Jewell, R.A., Paine, N. and Woods, R.I. (1985) “Design methods for steep
reinforced embankments ”Proceedings of the Symposium on Polymer Grid
Reinforcement in Civil Engineering, Thomas Telford, London, pp. 70-81.
13. Lee, K.M. and Manjunath, V.R. (2000) “Experimental and numerical
studies of geosynthetic-reinforced sand slopes loaded with a footing”
Candian Journal, Vol. 37, pp. 828-842.
14. Matsushima, k., Yamzaki, S., Morhi, Y., and Arangelovski, G. (2005).
Overflow model test of small dam with soil bag, Proc. 40th Annual
Symposium on Geotechnical Engineering, Sapporo (in Japanese).
15. Matsushima, M., Yamazaki, S., Mohri,Y., Hori, T., Ariyoshi, M. and
- 91 -
Tatsuoka, F. (2007a) Full-scale overflow-induced collapse tests on
embankments using soil bags anchored with geosynthetic reinforcement”
Proc. 5th Int. Sym.on Earth Reinforcement (IS Kyushu 2007).
16. Vesic, A.S. (1973) “Analysis of ultimate loads of shallow foundations”
Journal of Soil Mechanics and Foundation Division, ASCE , Vol. 99, No.1,
pp. 45-73.
17. 王偉鍵(2004) “加勁擋土牆耐震分析”, 國立成功大學土木研究所碩士
論文。
18. 吳書旭(2006) “加勁擋土結構物在强震下之變位分析” , 國立成功大
學土木研究所碩士論文。
19. 李咸亨(1990) “地工織物加勁擋土牆應力分佈”, 地工技術, 第32 期,
第5-12 頁。
20. 李咸亨、謝宗榮(1997) ”加勁擋土牆之抗震設計方法”, 地工技術, 第
43 期,第11-22 頁。
21. 李咸亨(1997) “神戶地震中加勁擋土牆的行為”, 現代營建, 第210
期,第24-29 頁。
22. 李咸亨、連偉智(1999) ”加勁擋土牆之動態行為解析”, 第八屆大地工
程學術研究討論會, 第886-893 頁。
23. 周南山(1993) “地工合成物加勁牆分析設計之探討與評估”, 地工技術,
- 92 -
第43 期,第32-42 頁。
24. 周禮輝(2001) “集集地震中加勁擋土牆之破壞調查與變形分析”, 國立
成功大學土木工程研究所碩士論文。
25. 陳榮河(1989) “加勁牆之分析與設計”, 地工技術, 第25 期,第46-61
頁。
26. 陳景文、吳宗欣、Claybourn, A. F. (1993) ”不同地工織物擋土牆設計
方法比較”, 地工技術, 第43 期,第43-49 頁。
27. 陳昱宏(2001) “位於斜坡上擋土牆之地震中破壞調查與變形分析”, 國
立成功大學土木工程研究所碩士論文。
28. 黃景川、陳昱宏、周禮輝(2001) “公路擋土系統在強震下之變位與補
強對策”, 地工技術, 第85 期,第13-24 頁。