A series of model tests were carried out on pure sand foundation and reinforced foundation with high-strength geocells to research the influences of single layer reinforcement depth, welded spacing and foundation soil compaction on the bearing capacity and deformation of the foundation. Furthermore, the reinforcement mechanism was summarized according to the distribution of tensile strain of geocell, additional stress under the reinforcement layer and the ultimate failure state of geocell and foundation. Results showed that geocell reinforcement could more than treble the bearing capacity of pure sand foundation, reduce the foundation settlement and improve the deformation resistance of geocell-reinforced layer. The effect of reinforcement increased with the decrease of geocell depth, welded spacing and the increase of foundation’s compaction. The influence of sand compaction was the largest, followed by geocell depth and welded spacing. The geocell of high strength in the middle played the most important role in reducing stress in the foundation soil and spread the stress to a larger scale by using its high tensile strength.
Key words
high-strength geocell /
reinforced foundation /
bearing capacity /
tensile strain /
stress spread
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References
[1] REA C, MITCHELL J K. Sand Reinforcement Using Paper Geocell[C]∥American Society of Civil Engineers, Proceedings of the Symposium on Earth Reinforcement, Pittsburg, April 27, 1978: 644-663.
[2] MHAISKAR S Y, MANDAL J N. Soft Clay Subgrade Stabilization Using Geocells[C]∥Grouting, Soil Improvement and Geosynthetics Volume 2: Geotechnical Special Publication No.30: Proceedings of the Conference Sponsored by the Geotechnical Engineering Division of the American Society of Civil Engineers. New Orleans, Louisana, February 25-28, 1992: 1092-1103.
[3] MHAISKAR S Y, MANDAL J N. Investigation on Soft Clay Subgrade Strengthening Using Geocells[J]. Construction and Building Materials, 1996, 10(4): 281-286.
[4] MOGHADDAS S N, DAWSON A R. Comparison of Bearing Capacity of a Strip Footing on Sand with Geocell and with Planar Forms of Geotextile Reinforcement[J]. Geotextiles and Geomembranes, 2010, 28(1): 72-84.
[5] 苏 谦, 蔡 英. 土工格栅、格室加筋砂垫层大模型试验及抗变形能力分析[J]. 西安交通大学学报, 2001, 36(2): 176-180. (SU Qian, CAI Ying. Geogrid and Geocell-Reinforced Sand Blanket: Model Test and the Ability to Reduce Deformation[J]. Journal of Southwest Jiaotong University, 2001, 36(2):176-180. (in Chinese))
[6] ALAWAJI H A. Settlement and Bearing Capacity of Geogrid-reinforced Sand over Collapsible Soil[J]. Geotextile and Geomembranes, 2001, 19(2): 75-88.
[7] BORGES J L, CARDOSO A S. Structural Behavior and Parametric Study of Reinforced Embankments on Soft Clays[J]. Computers and Geotechnics, 2001, 28(3): 209-233.
[8] LING H I, LIU H B. Performance of Geosynthetic-reinforced Asphalt Pavements[J]. Journal of Geotechnical and Geoenvironmental Engineering, 2001, 127(2):177-184.
[9] 刘金龙, 栾茂田, 王吉利, 等. 土工织物加固软土路基的机理分析[J]. 岩土力学, 2007, 28(5): 1009-1014. (LIU Jin-long, LUAN Mao-tian, WANG Ji-li, et al. Mechanism of Road Embankment Reinforced with Geotextile[J]. Rock and Soil Mechanics, 2007, 28(5): 1009-1014.(in Chinese))
[10]侯 娟, 张孟喜. 横-竖筋带布置对地基影响的试验研究[J]. 岩土力学, 2011, 32(8): 2365-2378. (HOU Juan, ZHANG Meng-xi. Experimental Research on Effect of Horizontal-vertical Reinforcement Configurations on Foundations[J]. Rock and Soil Mechanics, 2011, 32(8): 2365-2378. (in Chinese))
[11]GB50007—2011, 建筑地基基础设计规范[S]. 北京: 中国建筑工业出版社, 2011. (GB50007—2011, Code for Design of Building Foundation[S]. Beijing: China Architecture and Building Press, 2011. (in Chinese))
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