Research on anti-seepage grouting in completely weathered granite based on superfine materials

• Published in: 地质科技通报 Vol. 43; no. 1; pp. 194 - 203
• Main Authors: Yongfeng LI, Yuhao GAO, Tianle CHEN, Juguang ZHONG, Yue HU, Jianzhong LI
• Format: Journal Article
• Language: Chinese
• Published: Editorial Department of Bulletin of Geological Science and Technology 01.01.2024
• Subjects: completely weathered granite; microstructure; superfine bentonite; superfine cement; water pressure test
• ISSN: 2096-8523
• DOI: 10.19509/j.cnki.dzkq.tb20220298

Objective To solve the problems of "draught without slurry", poor groutability and slurry stability in the grouting process of completely weathered granite, a new composite grouting material is proposed in this paper to improve the anti-seepage and mechanical properties of completely weathered granite. Methods Through a series of laboratory experiments, it investigates the effects of different water-solid ratios, superfine bentonite, and superfine Portland cement content on the engineering properties of grouting materials. The formation mechanism of the slurry were studied, and the optimal formula of the cement slurry was determined. The experiment revealed the action mechanism of the two superfine materials on the fluidity, stability, and stone body strength of the grout. Finally, the castability and effectiveness of the grouting material were verified by a field test. Results The results show that the composite slurry with a water-solid ratio of 1.2, a content of superfine bentonite and superfine Portland c