期刊
ACTA GEOTECHNICA
卷 16, 期 3, 页码 841-857出版社
SPRINGER HEIDELBERG
DOI: 10.1007/s11440-020-01059-8
关键词
EICP; Precipitated particle size; Shear wave velocity; Solid content; Spectral induced polarization; Stiffness
资金
- Ministry of Science and Technology of China [2019YFC1805002, 2018YFC1802300]
- Basic Science Center Program for Multiphase Evolution in Hypergravity of the National Natural Science Foundation of China [51988101]
- National Natural Science Foundation of China [51779219]
- Overseas Expertise Introduction Center for Discipline Innovation [B18047]
The study used spectral induced polarization to monitor enzyme-induced carbonate precipitation, showing that SIP is an effective nondestructive monitoring tool for assessing the stiffness of geomaterials.
Heterogeneity in either chemically or microbiologically induced carbonate-based ground improvement methods is a major obstacle in engineering application. Spectral induced polarization (SIP), an innovative and nondestructive method, which has demonstrated promise in monitoring microbial activity, was used in this study to monitor enzyme induced carbonate precipitation (EICP). The complex conductivities, together with the shear wave velocities (V-s), of an EICP modified sand were monitored using a self-developed spectral induced polarization-bender element column. The mean precipitate size was calculated by relaxation time (tau) and the Schwarz equation. The precipitate contents were calculated by cumulative gamma distribution function on the global polarization magnitude (m(n)) withR(2) = 0.989. The stiffness of the enhanced geomaterial, in terms ofV(s), correlates tom(n)with a cumulative lognormal distribution function withR(2) = 0.967. Contact cementation was postulated as the dominant association pattern. The possible mechanism for this may be the formation of eddies and the nucleation of CaCO(3)crystals during precipitation. The results suggest that SIP can be used as an effective nondestructive monitoring tool to assess the stiffness of geomaterials.
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