(1. State Key Laboratory of Subtropical Building Science，South China University of Technology，Guangzhou，Guangdong 510640，China；2. Guangzhou Urban Planning and Design Survey Research Institute，Guangzhou，Guangdong 510030，China； 3. Key Laboratory of Geotechnical Mechanics and Engineering of Water Resources Ministry，Yangtze River Scientific Research Institute，Wuhan，Hubei 430010，China)
Abstract：How to build a quick and safe cofferdam in sea is a difficult challenge in land reclamation engineering. A new method named“big sandbag cofferdam”is developed and applied in many projects. In this paper，a series of centrifugal model tests were conducted to investigate the behavior of the big sandbag cofferdam. The stress-strain of geotextile was get by using a flexible glue to paste the strain gauge. It was found that the big sandbags have a good integrity and strong adaption to ground deformation. The uneven settlement of soft foundation without wick drains was obvious，sandbags near the slope toe were in tension，and those under the road center were pressurized. For the cofferdam installed with wick drains，the magnitude of maximum tension of the sandbag was higher，and the distribution of tension in reinforcement was more localized under the toe of the cofferdam. The mobilization of the tension reaches around 86% of the tensile strength. The existence of wick drains increases the strength of the foundation during the period of cofferdam construction. It can contribute significantly towards the stability of the cofferdam.
付海峰.模袋固化土海上围埝建造方法及理论研究[博士学位论文][D]. 天津：天津大学，2006.(FU Haifeng. Research on the construction method of the marine cofferdams with geotextile bags filled with solidified soil[Ph. D. Thesis][D]. Tianjin：Tianjin University，2006.(in Chinese))
[2]
羊 炜. 软土地基上模袋围堰稳定分析方法研究[硕士学位论文][D]. 广州：华南理工大学，2011(YANG Wei. Research on the stability of the cofferdams with geotextile bags filled with sand on soft soil foundation[M. S. Thesis][D]. Guangzhou：South China University of Technology，2011.(in Chinese))
[3]
张文斌，谭家华. 土工布冲砂袋的应用及其研究进展[J]. 海洋工程，2004，22(2)：98-104.(ZHANG Wenbin，TAN Jiahua. Application of sand-filled geotextile tubes and the state of the art of their researches[J]. The Ocean Engineering，2004，22(2)：98-104.(in Chinese))
[4]
刘海莲. 土工模袋在卢沟晓月湖右堤护坡工程中的应用[J]. 北京水利，2005，(3)：25-27.(LIU Hailian. Application of the geofabric in the slope protection project on the right bank of Lugouxiaoyue Lake[J]. Beijing Water Resources，2005，(3)：25-27.(in Chinese))
[5]
杨明江，张 丹，刘 浏. 水力填充砂袋围堰在阿联酋NAJMAT码头工程中的应用[J]. 中国港湾建设，2009，(3)：45-48.(YANG Mingjiang，ZHANG Dan，LIU Liu. Application of sand-bag cofferdam by hydraulic filling for NAJMAT project in UAE[J]. China Harbour Engineering，2009，(3)：45-48.(in Chinese))
[6]
王新强，许 佳，陈 洁，等. 围堤工程大型充砂袋高效施工技术[J]. 中国港湾建设，2010，(2)：58-59.(WANG Xinqiang，XU Jia，CHEN Jie，etal. High efficiency construction technology of large-size sand-filled bags in closing levee project[J]. China Harbour Engineering，2010，(2)：58-59.(in Chinese))
[7]
YOSHIHISA M，RICHARD J B. Reliability analysis of soil-geogrid pullout models in Japan[J]. Soils and Foundations，2012，52(4)：620-633.
[8]
LIU S H，HAJIME M. A new earth reinforcement method by soilbags[J]. Rock andMechanics，2007，28(8)：1665-1670.
[9]
白福青，刘斯宏，王艳巧. 土工袋加固原理与极限强度的分析研究[J].岩土力学，2010，31(增1)：172-176.(BAI Fuqing，LIU Sihong，WANG Yanqiao. Research on reinforcement mechanism and failure strength of soilbags[J]. Rock and Soil Mechanics，2010，31(Supp.1)：172-176.(in Chinese))
[10]
中华人民共和国行业标准编写组. SL235—2012土工合成材料测试规程[S]. 北京：中国水利水电出版社，2012.(The Professional Standards Compilation Group of People¢s Republic of China. SL235—2012 Specification for test and measurement of geosynthetics[S]. Beijing：China Waterand PowerPress，2012.(in Chinese))
[11]
SHARMA JS，BOLTON MD. Centrifugal and numerical modelling of reinforced embankments on soft clay installed with wick drains[J]. Geotextiles and Geomembranes，2001，19(1)：23-44.
2016, Vol. 35 
