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Volume 33 Issue 12
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CHEN Yong-hui, SHI Gang-chuan, CAO De-hong, YING Hai-jian, WANG Xin-quan. Control of post-construction settlement by replacing subgrade with foamed cement banking[J]. Chinese Journal of Geotechnical Engineering, 2011, 33(12): 1854-1862.
Citation: CHEN Yong-hui, SHI Gang-chuan, CAO De-hong, YING Hai-jian, WANG Xin-quan. Control of post-construction settlement by replacing subgrade with foamed cement banking[J]. Chinese Journal of Geotechnical Engineering, 2011, 33(12): 1854-1862.
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Control of post-construction settlement by replacing subgrade with foamed cement banking

  • (1. Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing 210098, China ； 2. Geotechnical Research institute, Hohai University, Nanjing 210098, China; 3. National Engineering Research Center of Water Resources Efficient Utilization and Engineering Safety, Nanjing 210098, China; 4. Construction Project Quality Supervision Station of Huzhou, Huzhou 313028,China; 5. Zhejiang Communications Investment Group Co., Ltd., Hangzhou 310014, China; 6. Traffic Investigation and Design Institute of Zhejiang, Hangzhou 310007, China; 7. Department of Civil Engineering, Zhejiang University City College, Hangzhou 310015, China)

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  • Published Date: December 14, 2011
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    • Abstract
  • When using the preloading method to reinforce expressway soft subsoil, owing to the short preloading period and other reasons, some road sections usually exhibit large settlement rate and do not satisfy the settlement and stability requirement before the starting of pavement construction. Treatment is needed to control the post-construction settlement in a short period. A case study of controlling the post-construction by adopting the foamed cement banking (FCB) to replace parts of subgrade of Shanghai-Jiaxign-Huzhou-Hangzhou Expressway (Lianshi-Hangzhou section) in Zhejiang Province is introduced. According to the laboratory immersion tests, the correction method is put forward for soil-free FCB, as its design bulk density is affected by the water. A settlement prediction method is established, which can reflect the overloading-unloading-reloading procedure for FCB replacing the subgrade, and it is used to calculate the FCB replacement capacity of FCB. In addition, the stability criteria are proposed by using the effective overloading ratio to correct the conventional settlement rate, and a simple method is also presented to estimate the replacement volume of FCB according to the measured settlement rates. Finally the results of the theoretical method are compared with the measured data.
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    • References (18)
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