%0 Journal Article
%A CHEN  Xin
%A AN  Ran
%A ZHANG  Xian-wei
%A CHEN  Chang
%A YUAN  Tong
%T Disintegration Characteristics of MICP-treated Granite Residual Soils
%D 2025
%R 10.11988/ckyyb.20231104
%J Journal of Changjiang River Scientific Research Institute
%P 138-144
%V 42
%N 2
%X <p id="p00010">Granite residual soil is highly absorbent and prone to disintegration in the presence of water, which poses potential safety hazards for engineering construction. Microbial-induced calcium carbonate precipitation (MICP), as a new reinforcement method, can significantly improve the disintegration properties of soils. Disintegration tests were conducted on natural and MICP-treated soil samples with different cementation concentrations, and the disintegration mechanism was analyzed based on X-ray diffraction spectra and scanning electron microscope (SEM) images. Results reveal that the disintegration processes of the natural soil samples can be divided into three stages: surface water absorption and spalling stage, soil softening stage stage, and complete disintegration stage. In contrast, the MICP-treated samples exhibit four stages: forced water intrusion stage, fissure development stage, intense erosion stage, and stable disintegration stage. Under MICP treatment, the disintegration curve of the residual soil transitions from complete disintegration to incomplete disintegration characteristics. With the increase of calcium carbonate content, the disintegration resistance can be obviously enhanced. Calcium carbonate crystals are mainly distributed on sample surfaces, within pores and at contact points, playing crucial roles in encapsulating, filling, and cementing soil particles, which are the main reasons for improving the disintegration characteristics of residual soils. These findings provide valuable references for enhancing the disintegration properties of residual soils in engineering applications.</p>
%U http://ckyyb.crsri.cn/EN/10.11988/ckyyb.20231104