Review, outlook and application technology design on soil improvement by microbial induced calcium carbonate precipitation#br#
Li Mingdong1,2 Lin Li3 Zhang Zhendong1 Li Chi4
1. Huaihai Institute of Technology, Lianyungang 222005, China;
2. The Key Laboratory of the Coastal Zone Exploitation and Protection, Ministry of Land and Resource, Nanjing 210024, China;
3. Jackson State University, 1400 J.R. Lynch Street, MS, USA;
4. Inner Mongolia University of Technology, Hohhot 010051, China
Abstract：Microbial induced calcium carbonate precipitation (MICP) can produce CaCO3 cementation, which may result in the improvement of strength and the reduction of permeability by filling soil pores and bonding soil particles. The improved performance of MICP implies its broad applications including microbial grouting, earth dam reinforcement, wind protection and sand fixation, seepage protection for dam and dam bottom, remediation for contaminated soil or groundwater. The studies on soil improvement by MICP were summarized, analyzed and outlooked. It is seen that with MICP, the unconfined compressive strength of sand can be improved to 20MPa, its permeability may be reduced to 1% of that of untreated sand, and its shear wave velocity may be increased to 4 times of that of untreated sand, which makes it applicable to geotechnical engineering. It is also believed that in the next research stage, emphasis shall be put on the systematic studies on the uniformity of treatment effect, the applicable scope of ground soil, and the comprehensive performance (such as durability, dynamic performance, corrosion resistance, etc.) of treated soil. To a small extent, MICP has been applied to the stabilization of gravel soil and leakage prevention of basement. It is found that construction technologies are the bottleneck of MICP in practical egnineering application. Construction technologies of MICP in geotechnical engineering are designed, including ground reinforcement, improvement of liquefied ground, remediation of contaminated soil (or groundwater), leakage prevention of dam and sand pile reinforcement, so that MICP technologies can be broadly applied to engineering practice.
李明东 Lin Li 张振东 李驰. 微生物矿化碳酸钙改良土体的进展、展望与工程应用技术设计[J]. 土木工程学报, 2016, 49(10): 80-87.
Li Mingdong Lin Li Zhang Zhendong Li Chi. Review, outlook and application technology design on soil improvement by microbial induced calcium carbonate precipitation#br#. 土木工程学报, 2016, 49(10): 80-87.
