基于不完全土拱效应的土工格栅加固机制与设计方法

Abstract
Figure/Table
References
Related Citation (15)

Download: PDF (1110 KB) HTML (1 KB)
Export: BibTeX | EndNote (RIS)

Abstract The mechanism of geosynthetic membrane effect is analyzed by utilizing geometrical and mechanical method，and the stress state of the embankment within the subsidence cupboard is deduced based on an assumption of an idealized slanted sliding surface，and the development of the shearing stress along the sliding surface is considered in the coefficient of active lateral earth pressure. The membrane effect and stress-strain state are coupled in the proposed calculation model. Then，a physical model test was performed to monitor the settlement and induced axial tensile strains of reinforcements，and the earth pressure，etc. A comparison of the test results to the proposed calculation model and several traditional design methods demonstrates that：the proposed method results are more close to the test results，which can take good care of the varying process of relative displacement and realistic slanted sliding surface. Because of different definitions of coefficient of lateral earth pressures，the vertical stress calculated from Terzaghi?s method is small while that from Handy?s method is large；For the strain of geosynthetic，the Giroud?s method is considered to be too conservative and the Esponiza?s is a little small，and the strain calculated from the proposed method is a little large，but it is reasonable when considering the serviceability and long-term creep of the geosynthetic.

Key words： soil mechanics geogrid partially developed soil arch effect differential settlement inclined sliding surface membrane effect

Received: 04 November 2011

	Service

	E-mail this article
	Add to my bookshelf
	Add to citation manager
	E-mail Alert
	RSS
	Articles by authors

Cite this article:

URL:

https://rockmech.whrsm.ac.cn/EN/Y2012/V31/I3/632

[1] 刘吉福. 路堤下复合地基桩、土应力比分析[J]. 岩石力学与工程学报，2003，22(4)：674–677.(LIU Jifu. Analysis of pile-soil stress ratio for composite ground embankment[J]. Chinese Journal of Rock Mechanics and Engineering，2003，22(4)：674–677.(in Chinese)) [2] 陈仁朋，贾宁，陈云敏. 桩承式加筋路堤受力机制及沉降分析[J]. 岩石力学与工程学报，2005，24(23)：4 358–4 367.(CHEN Renpeng，JIA Ning，CHEN Yunmin. Mechanism and settlement analysis of pile-supported and geogrid-reinforced embankments[J]. Chinese Journal of Rock Mechanics and Engineering，2005，24(23)：4 358– 4 367.(in Chinese)) [3] 曹卫平，陈云敏，陈仁朋. 考虑路堤填筑过程与地基土固结相耦合的桩承式路堤土拱效应分析[J]. 岩石力学与工程学报，2008，27(8)：1 610–1 617.(CAO Weiping，CHEN Yunmin，CHEN Renpeng. Analysis of soil arching in piled embankments considering coupled effect of embankment filling and soil consolidation[J]. Chinese Journal of Rock Mechanics and Engineering，2008，27(8)：1 610– 1 617.(in Chinese)) [4] HAN J，GABR M A. Numerical analysis of geosynthetic-reinforced and pile-supported earth platforms over soft soil[J]. Journal of Geotechnical and Geoenvironmental Engineering，2002，128(1)：44–53. [5] British Standard Institution. BS 8006—1995 Code of practice for strengthened/reinforced soils and other fills[S]. London，England：British Standards Institution，1995. [6] TERZAGHI K. Theoretical soil mechanics[M]. New York：J. Wiley and Sons，Inc.，1943：66–76. [7] SADREKARIMI J，ABBASNEJAD A. Arching effect in fine sand due to base yielding[J]. Canadian Geotechnical Journal，2010，47(3)：366–374. [8] HANDY R L. The arch in soil arching[J]. Journal of Geotechnical Engineering，1985，111(3)：302–318. [9] SHUKLA S K，GAURAV，SIVAKUGAN N. A simplified extension of the conventional theory of arching in soils[J]. International Journal of Geotechnical Engineering，2009，3(3)：353–359. [10] SHUKLA S K，LOUGHRAN J G，SIVAKUGAN N. Stress within a cohesionless granular fill in a storage vessel with sloping walls during initial static loading[J]. Powder Technology，2009，192(3)：389–393. [11] GIROUD J P，BONAPQRTE R，BEECH J F，et al. Design of soil layer-geosynthetic systems overlying voids[J]. Geotextiles and Geomembranes，1990，9(1)：11–50. [12] ESPINOZA R D. Soil-geotextile interaction evaluation of membrane support[J]. Geotextiles and Geomembranes，1994，13(5)：281–293. [13] VILLARD P， BRIANCON L. Design of geosynthetic reinforcements for platforms subjected to localized sinkholes[J]. Canadian Geotechnical Journal，2008，45(2)：196–209. [14] 王非，缪林昌. 落水洞上覆路堤土工加筋设计新方法[J]. 东南大学学报：自然科学版，2009，39(6)：1 217–1 221.(WANG Fei，MIAO Linchang. New design method of the geosynthetic-reinforced embankment over sinkholes[J]. Journal of Southeast University：Natural Science，2009，39(6)：1 217–1 221.(in Chinese)) [15] KRYNINE D P. Discussion of “stability and stiffness of cellular cofferdams” by Karl Terzaghi[J]. Transactions，1945，110：1 175– 1 178.