PMID- 37176311
OWN - NLM
STAT- PubMed-not-MEDLINE
LR  - 20230515
IS  - 1996-1944 (Print)
IS  - 1996-1944 (Electronic)
IS  - 1996-1944 (Linking)
VI  - 16
IP  - 9
DP  - 2023 Apr 27
TI  - Experimental Study on Acoustic Emission Characteristics of Uniaxial Compression 
      of MICP-Filled Sandstone.
LID - 10.3390/ma16093428 [doi]
LID - 3428
AB  - Rock masses are inherently heterogeneous, with numerous fractures that 
      significantly affect their mechanical properties, fracture characteristics, and 
      acoustic emission features due to the interactions between fractures or between 
      fractures and the rock mass. Microbially induced calcite precipitation (MICP) 
      technology, as an emerging non-destructive biological grouting reinforcement 
      method, can repair fractured rock masses and alter their internal conditions. To 
      investigate the mechanical properties, failure process evolution, and MICP repair 
      effects of sandstone before and after repair, uniaxial compression tests were 
      conducted on prefabricated, fractured (0.7-2.0 mm width) filled and unfilled rock 
      samples, with acoustic emission monitoring throughout the process. Acoustic 
      emission signal characteristics of the rock samples under stress were 
      comparatively analyzed, determining the rock failure process and the microscopic 
      failure types at compression-density stages, elastic stages, and destruction 
      stages. The results show that the properties of the filled specimens improved, 
      the failure process was mitigated, and the final failure stage was dominated by 
      tension signals, accounting for over 60% of the total. The filling effect was 
      better than 1.5-2.0 mm when the fracture width was 0.7-1.0 mm. The study deeply 
      reveals the evolutionary process of compressive failure of the two types of rocks 
      under different fracture widths, and by correlating the acoustic emission 
      parameters with the stress-strain process, it provides a theoretical basis for 
      repairing rock fractures using microbial engineering technology and offers 
      experimental evidence and possible directions for the improvement and 
      optimization of MICP technology.
FAU - Fan, Ling
AU  - Fan L
AD  - School of Resources and Safety Engineering, Central South University, Changsha 
      410083, China.
FAU - Wang, Chengbo
AU  - Wang C
AUID- ORCID: 0009-0009-0433-057X
AD  - School of Resources and Safety Engineering, Central South University, Changsha 
      410083, China.
FAU - Hu, Di
AU  - Hu D
AD  - School of Resources and Safety Engineering, Central South University, Changsha 
      410083, China.
LA  - eng
GR  - No. 52174100/National Natural Science Foundation of China/
GR  - No. 51674287/National Natural Science Foundation of China/
GR  - No. 2021JJ30834/National Science Foundation of Hunan Province,China/
PT  - Journal Article
DEP - 20230427
PL  - Switzerland
TA  - Materials (Basel)
JT  - Materials (Basel, Switzerland)
JID - 101555929
PMC - PMC10180223
OTO - NOTNLM
OT  - MICP repair
OT  - acoustic emission parameters
OT  - fracture
OT  - non-destructive
OT  - uniaxial compression test
COIS- The authors declare no conflict of interest.
EDAT- 2023/05/13 15:12
MHDA- 2023/05/13 15:13
PMCR- 2023/04/27
CRDT- 2023/05/13 01:32
PHST- 2023/03/23 00:00 [received]
PHST- 2023/04/16 00:00 [revised]
PHST- 2023/04/20 00:00 [accepted]
PHST- 2023/05/13 15:13 [medline]
PHST- 2023/05/13 15:12 [pubmed]
PHST- 2023/05/13 01:32 [entrez]
PHST- 2023/04/27 00:00 [pmc-release]
AID - ma16093428 [pii]
AID - materials-16-03428 [pii]
AID - 10.3390/ma16093428 [doi]
PST - epublish
SO  - Materials (Basel). 2023 Apr 27;16(9):3428. doi: 10.3390/ma16093428.