Journal of Jilin University(Earth Science Edition) ›› 2017, Vol. 47 ›› Issue (3): 818-825.doi: 10.13278/j.cnki.jjuese.201703202

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Settlement Characteristics of Composite Foundation Reinforced by Flexible Piles with Lateral Restraint

Wu Youping1,2, Zhang Keneng1,2, Liu Jie3, He Jie3   

  1. 1. School of Geosciences and Info-Physics, Central South University, Changsha 410083, China;
    2. Key Laboratory of Non-Ferrous Resources and Geological Hazard Detection, Hunan Province, Changsha 410083, China;
    3. School of Civil Engineering, Hunan University of Technology, Zhuzhou 412008, Hunan, China
  • Received:2016-09-11 Online:2017-05-26 Published:2017-05-26
  • Supported by:
    Supported by National Natural Science Foundation of China (51078140, 51108176)

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Abstract: Lateral restraint technique can effectively reduce the ground settlement during the treatment practice of soft soil foundation. Based on the characteristics of road engineering and engineering properties of soft soil, the effect of lateral restraint (pile) on the settlement of composite foundation reinforced by flexible pile (rammed soil-cement pile) was studied by means of model experiment and numerical simulation. Furthermore, the changing patterns of pile and soil settlement with the loading level were analyzed, and the influence of soil modulus and pile spacing on foundation settlement was discussed taking the lateral restraint condition into consideration. The results revealed that when lateral restraint piles were applied to the composite foundation reinforced by flexible pile, the pile spacing of 2d (d is pile diameter) and 3d both reduced the pile settlement effectively if soil compression modulus was low; as the soil compression modulus increased, the settlement reducing effects decreased when pile spacing was 3d, and it increased when pile spacing was 2d, while the settlement reducing effects can hardly be observed when pile spacing was 4d. However, as the piles spacing was 2d and 3d, the reducing effect to soil settlement decreased first and then increased; when pile spacing of 4d was applied, the reduced amount of the settlement was around 4%-5%. Therefore, a reasonable setting of lateral restraint pile was required for effectively restricting the lateral extrusion of soft soil, and consequently reducing the settlement of composite foundation.

Key words: lateral restraint, composite foundation reinforced by flexible pile, settlement, settlement ratio

CLC Number: 

  • TU477
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