细黏粒含量对微生物固化海岸砂土性能的影响

兰州理工大学学报 ›› 2026, Vol. 52 ›› Issue (3): 15-22.

细黏粒含量对微生物固化海岸砂土性能的影响

蒋明强^*1, 刘晓燕², 王腾³, 冯琼⁴

1.甘肃省第五建设集团有限责任公司, 甘肃天水 741000;
2.甘肃建投土木工程建设集团有限公司, 甘肃兰州 730050;
3.潍坊科技学院土木工程学院, 山东潍坊 262700;
4.兰州理工大学土木与水利工程学院, 甘肃兰州 730050

收稿日期:2025-12-08 出版日期:2026-06-28 发布日期:2026-06-30
通讯作者: 蒋明强(1981-),男,甘肃甘谷人,高级工程师.Email:495461511@qq.com
基金资助:
甘肃省科技计划项目(25CXGA070),甘肃省建设科技攻关项目(JK2025-7)

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

JIANG Ming-qiang¹, LIU Xiao-yan², WANG Teng³, FENG Qiong⁴

1. Gansu Province Fifth Construction Group Co., Ltd., Tianshui 741000, China;
2. Gansu Construction Investment Civil Engineering Group Co., Ltd., Lanzhou 730050, China;
3. School of Civil Engineering, Weifang University of Science and Technology, Weifang 262700, China;
4. School of Civil and Hydraulic Engineering, Lanzhou University of Technology, Lanzhou 730050, China

Received:2025-12-08 Online:2026-06-28 Published:2026-06-30

摘要/Abstract

摘要： 以海岸侵蚀问题为背景,采用经海水与低温驯化的巴氏芽孢杆菌对不同细黏粒质量分数(0~28%)的海砂进行固化处理.通过固化土体的无侧限抗压强度、三轴剪切特性、碳酸钙生成量等物理力学性能测试,结合微观结构分析,综合评价了微生物固化技术对海岸砂土的固化效果,探究了细黏粒含量对固化效果的影响机制.结果表明:微生物驯化能有效提升其在海水环境中的活性,固化试样强度较未驯化组提高7.7%;细黏粒含量对固化效果具有显著影响,当其质量分数为12%时,碳酸钙生成量与无侧限抗压强度均达到峰值;适量细黏粒可作为成核位点促进胶结,而过量细黏粒(>12%)则会堵塞孔隙,阻碍浆液运移,导致强度与碳酸钙生成量显著下降.

关键词: 微生物固化, 海岸砂土, 细黏粒含量, 力学性能, 微观结构

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

中图分类号:

TU528.01

蒋明强, 刘晓燕, 王腾, 冯琼. 细黏粒含量对微生物固化海岸砂土性能的影响[J]. 兰州理工大学学报, 2026, 52(3): 15-22.

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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链接本文: https://journal.lut.edu.cn/CN/

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

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