Journal of Northeastern University Natural Science ›› 2018, Vol. 39 ›› Issue (7): 1033-1037.DOI: 10.12068/j.issn.1005-3026.2018.07.024

• Resources & Civil Engineering • Previous Articles     Next Articles

Healing Experiment for Rock Mass Structural Plane Based on Bacterially Induced Calcium Carbonate

LIU Dong, SHAO An-lin, ZHAO Xin, JIN Chang-yu   

  1. School of Resources & Civil Engineering, Northeastern University, Shenyang 110819, China.
  • Received:2017-09-25 Revised:2017-09-25 Online:2018-07-15 Published:2018-07-11
  • Contact: SHAO An-lin
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Abstract: Sporosarcina pasteurii-induced calcium carbonate precipitation was used to heal structural planes of migmatitic granite. Conductivity variations was applied to characterize the urease activity for bacteria liquid to investigate the growth law and physicochemical properties of Sporosarcina pasteurii after curing in activated culture. Additionally, microscopic methods including XRD, EDS and SEM were conducted to analyze the induced products of Sporosarcina pasteurii on structural planes. The results show that, the urease activity for bacteria liquid of Sporosarcina pasteurii is the highest after curing 22 ~ 28 hours. The optimum physicochemical environment for Sporosarcina pasteurii growth is 30℃ at pH 8. The sediment product produced by Sporosarcina pasteurii on structural planes is cubic crystals with a side length of 5~10μm, and they grow in a way of screw dislocation to backfill and then repair structures planes.

Key words: rock mass, structural plane, bacteria, healing, calcium carbonate

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