广东工业大学学报 ›› 2022, Vol. 39 ›› Issue (02): 99-104.doi: 10.12052/gdutxb.210090

• 综合研究 • 上一篇    下一篇

微生物固化花岗岩残积土耐崩解性能及抗冲刷性能研究

冯德銮, 肖雪莉, 梁仕华, 朱翀   

  1. 广东工业大学 土木与交通工程学院, 广东 广州 510006
  • 收稿日期:2021-06-12 出版日期:2022-03-10 发布日期:2022-04-02
  • 通信作者: 梁仕华(1976-)，男，教授，博士，主要研究方向为环境岩土及地下空间工程，E-mail：shihua_l@gdut.edu.cn
  • 作者简介:冯德銮(1985-)，男，讲师，博士，主要研究方向为岩土工程，E-mail：wolfluan@126.com
  • 基金资助:
    国家自然科学基金资助项目(52078142)；广州市科技计划项目(202002030194)

Disintegration Resistance and Scouring Resistance of Microbial Solidified Granite Residual Soil

Feng De-luan, Xiao Xue-li, Liang Shi-hua, Zhu Chong   

  1. School of Civil and Transportation Engineering, Guangdong University of Technology, Guangzhou 510006, China
  • Received:2021-06-12 Online:2022-03-10 Published:2022-04-02

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摘要： 采用喷洒方式对花岗岩残积土进行表面处理并进行耐崩解试验和抗冲刷模型试验。结合扫描电镜观测和颗粒粒度分析等微观测试技术，研究了喷洒式微生物诱导碳酸钙沉淀(Microbially Induced Calcium Carbonate Precipitation , MICP)表面处理对花岗岩残积土的耐崩解性和抗冲刷性的改善效果，并探讨其微细观控制机制。结果表明：经喷洒式MICP表面处理后，花岗岩残积土的微细颗粒胶结成尺寸较大的团聚体，试样的微观结构更加致密。同时，试样表面形成一层水稳性良好的碳酸钙和土颗粒连续胶结的硬壳层，从而有效地改善花岗岩残积土的耐崩解性和抗冲刷性。研究结果可为花岗岩残积土边坡加固提供可靠的依据。

关键词: 花岗岩残积土, 抗冲刷性能, MICP, 边坡, 团聚体

Abstract: In order to investigate the effect of microbially induced calcium carbonate precipitation (MICP) surface treatment on the disintegration resistance and scour resistance of granite residual soils and its microscopic control mechanism, the granite residual soils were treated by spraying and subjected to disintegration resistance tests and scour resistance model tests, combined with microscopic testing techniques such as scanning electron microscopy and particle size analysis. The results showed that after the sprayed MICP surface treatment, the microfine particles of granite residual soil were cemented into larger size agglomerates, the microstructure of the specimens was more dense, and a continuous cemented hard shell layer of calcium carbonate and soil particles with good water stability was formed on the surface of the specimens, which effectively improved the disintegration resistance and scouring resistance of granite residual soil.The results of the study can provide a reliable basis for the reinforcement of granite residual soil slopes.

Key words: granite residual soil, scouring resistance, microbially induced calcium carbonate precipitation (MICP), slope, aggregates

中图分类号: 

  • TU449
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