PMID- 30212556
OWN - NLM
STAT- MEDLINE
DCOM- 20190307
LR  - 20190307
IS  - 1932-6203 (Electronic)
IS  - 1932-6203 (Linking)
VI  - 13
IP  - 9
DP  - 2018
TI  - Study on healing technique for weak interlayer and related mechanical properties 
      based on microbially-induced calcium carbonate precipitation.
PG  - e0203834
LID - 10.1371/journal.pone.0203834 [doi]
LID - e0203834
AB  - The weak interlayer refers to the filling material in shear belts or large-scale 
      structural planes, which is usually composed of soil, fine sand and gravels. It 
      is prone to argillization when encountering water and its mechanical strength and 
      stiffness are generally low, which has adverse effects on the stability of 
      underground structures. In recent years, research on reinforcement techniques for 
      weak interlayers has been a hot topic in geotechnical field. As a new 
      reinforcement method for structural planes, the microbial healing technique has 
      attracted a lot of attention. In this paper, a study on the healing technique for 
      weak interlayer based on microbially induced calcium carbonate precipitation 
      (MICP) and related mechanical properties was conducted for the interlayer shear 
      belt at Baihetan Hydropower Station in China. First, Sporosarcina pasteurii was 
      activated in laboratory. Reinforcement of the weak interlayer was realized by 
      utilizing calcium carbonate precipitation on the weak interlayer. Continuous 
      monitoring of the precipitates on the weak interlayer by XRD and SEM indicated 
      that the precipitates on the weak layer were microbially induced calcium 
      carbonate. Its crystals were irregular fish scale-shaped cubes with size in the 
      range of 5~20mum. With favorable crystal growth, the crystals and the particles of 
      the weak interlayer were cemented together. Finally, the mechanical properties of 
      the healed weak interlayer were tested and the variations of uniaxial compressive 
      strength, shear strength and triaxial compressive strength with bacteria 
      concentration were discussed. The test results indicated that the maximum 
      uniaxial compressive strength, peak shear strength and triaxial compressive 
      strength can be increased by 149%, 162% and 119%, respectively, which 
      subsequently improve the overall strength of the shear zone or structural plane. 
      This can provide a new idea for soft ground reinforcement in underground 
      projects.
FAU - Jin, Changyu
AU  - Jin C
AD  - Intelligent Mine Research Center, Northeastern University, Shenyang, Liaoning, P. 
      R. China.
FAU - Liu, Dong
AU  - Liu D
AUID- ORCID: 0000-0001-8866-7042
AD  - Intelligent Mine Research Center, Northeastern University, Shenyang, Liaoning, P. 
      R. China.
FAU - Shao, Anlin
AU  - Shao A
AD  - Intelligent Mine Research Center, Northeastern University, Shenyang, Liaoning, P. 
      R. China.
FAU - Zhao, Xin
AU  - Zhao X
AD  - School of Resource and Civil Engineering, Northeastern University, Shenyang, 
      Liaoning, P. R. China.
FAU - Yang, Lei
AU  - Yang L
AD  - School of Engineering, RMIT University, Melbourne, Australia.
FAU - Fan, Fuquan
AU  - Fan F
AD  - Intelligent Mine Research Center, Northeastern University, Shenyang, Liaoning, P. 
      R. China.
FAU - Yu, Kunpeng
AU  - Yu K
AD  - School of Resource and Civil Engineering, Northeastern University, Shenyang, 
      Liaoning, P. R. China.
FAU - Lin, Rongbing
AU  - Lin R
AD  - Wuhan Institute of Geodesy of the Chinese Academy of Sciences, Wuhan, Hubei, P. 
      R. China.
FAU - Huang, Jingzhu
AU  - Huang J
AD  - School of Resource and Civil Engineering, Northeastern University, Shenyang, 
      Liaoning, P. R. China.
FAU - Ding, Chenggong
AU  - Ding C
AD  - Intelligent Mine Research Center, Northeastern University, Shenyang, Liaoning, P. 
      R. China.
LA  - eng
PT  - Journal Article
PT  - Research Support, Non-U.S. Gov't
DEP - 20180913
PL  - United States
TA  - PLoS One
JT  - PloS one
JID - 101285081
RN  - H0G9379FGK (Calcium Carbonate)
SB  - IM
MH  - Calcium Carbonate/chemistry/*metabolism
MH  - Chemical Precipitation
MH  - Construction Industry/*methods
MH  - Microscopy, Electron, Scanning
MH  - Power Plants
MH  - Shear Strength
MH  - *Soil Microbiology
MH  - Sporosarcina/*metabolism
PMC - PMC6136771
COIS- The authors have declared that no competing interests exist.
EDAT- 2018/09/14 06:00
MHDA- 2019/03/08 06:00
PMCR- 2018/09/13
CRDT- 2018/09/14 06:00
PHST- 2018/03/30 00:00 [received]
PHST- 2018/08/28 00:00 [accepted]
PHST- 2018/09/14 06:00 [entrez]
PHST- 2018/09/14 06:00 [pubmed]
PHST- 2019/03/08 06:00 [medline]
PHST- 2018/09/13 00:00 [pmc-release]
AID - PONE-D-18-09625 [pii]
AID - 10.1371/journal.pone.0203834 [doi]
PST - epublish
SO  - PLoS One. 2018 Sep 13;13(9):e0203834. doi: 10.1371/journal.pone.0203834. 
      eCollection 2018.