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Application Research of Bio-grouting in Hydraulic Fill Fine Sands for Reclamation Projects

  • Jijian Lian
  • Hongyin Xu
  • Xiaoqing He
  • Yue Yan
  • Dengfeng Fu
Conference paper

Abstract

A kind of fine black sands is always hydraulic filled onto the backfilled silt to support the equipment in reclamation projects in Tianjin, China. Bio-grouting, as a new approach of soil improvement, was adopted to cement black sands on the surface of silt to rapidly increase the carrying capacity. The results showed that the black sands were well cemented by calcium carbonate crystals produced in the process of bio-mineralization. A static load test was carried out on the cemented sand layer, which resulted of an increase of the loading-bearing capacity by about sixty times. The calcium carbonate contents of different positions in the cemented sand layer were detected, which showed an uneven distribution. The micro-structures of the produced calcium crystals were observed by using an electron microscopy. Different forms of crystals were observed, illustrating that the concentrations of bacteria in the sand layer were not uniform. From discussion, the bio-grouting method can cement the black sand layer and the solidification effect can be improved by some reasonable measures, which indicates the feasibility of this method in reclamation projects. Moreover, the bio-grouting method can bring a lot of time saving and material saving compared with traditional methods.

Keywords

Bio-grouting Black fine sand Static load test Calcium carbonate contents 

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Copyright information

© Springer Nature Singapore Pte Ltd. 2018

Authors and Affiliations

  • Jijian Lian
    • 1
  • Hongyin Xu
    • 1
  • Xiaoqing He
    • 1
  • Yue Yan
    • 1
  • Dengfeng Fu
    • 1
  1. 1.School of Civil EngineeringTianjin UniversityTianjinChina

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