Effects of fine clay content on the properties of microbial solidified coastalsands

Abstract

Abstract: Against the background of coastal erosion problems, Bacillus pasteurii that was acclimatized to seawater and low-temperature was used to solidify coastal sands with different fine clay mass-fraction (0%~28%). Through physical and mechanical property tests of solidified soil bodies, including unconfined compressive strength, triaxial shear characteristics, and calcium carbonate generation amount, combined with microstructure analysis, the solidification effect of microbial solidification technology on coastal sands was comprehensively evaluated, and the influence mechanism of fine clay content on the solidification effect was explored. The results showed that microbial acclimatization effectively enhances bacterial activity in the seawater environment, increasing the strength of treated specimens by 7.7% compared with the unacclimatized group. The mass-fraction of fine clay has a significant impact on the solidification effect. When its content is 12%, both calcium carbonate generation and unconfined compressive strength reach their peak values. An appropriate amount of fine clay can serve as nucleation sites to promote cementation, while excessive fine clay (>12%) tends to block pores and hinder slurry migration, leading to a significant decrease in strength and calcium carbonate generation.

Key words: microbial solidified, coastal sands, fine clay content, mechanical properties, microstructure

CLC Number:

TU528.01

JIANG Ming-qiang, LIU Xiao-yan, WANG Teng, FENG Qiong. Effects of fine clay content on the properties of microbial solidified coastalsands[J]. Journal of Lanzhou University of Technology, 2026, 52(3): 15-22.

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URL: https://journal.lut.edu.cn/EN/

https://journal.lut.edu.cn/EN/Y2026/V52/I3/15

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