| Issue |
E3S Web of Conf.
Volume 406, 2023
2023 9th International Conference on Energy Materials and Environment Engineering (ICEMEE 2023)
|
|
|---|---|---|
| Article Number | 01026 | |
| Number of page(s) | 6 | |
| Section | Biological Device and Material Structure Analysis | |
| DOI | https://doi.org/10.1051/e3sconf/202340601026 | |
| Published online | 31 July 2023 | |
Effect of Composite Microbial Biopolymer Treatment on Hydraulic Conductivity of Completely Decomposed Granite Soil
1 Guangdong Provincial Key Laboratory of Intelligent and Resilient Structures for Civil Engineering, Harbin Institute of Technology, Shenzhen, Shenzhen, China
2 School of Civil and Environmental Engineering, Harbin Institute of Technology, Shenzhen, Shenzhen, China
3 Shenzhen Hongyeji Technology Co., Ltd. Shenzhen, China
4 Shenzhen Key Laboratory of Intelligent Structure System in Civil Engineering, Harbin Institute of Technology, Shenzhen Shenzhen, China
* Corresponding author: lizhaofeng@hit.edu.cn
In southeast China, slope with completely decomposed granite (CDG) soil is susceptible to landslide under heavy rainfall, due to the fissure-rich and slaking characteristics of this kind of soil. In this context, this study attempted to hydraulically improve the CDG soil in a low-carbon manner by using the composite of xanthan gum and guar gum (i.e., two different microbial biopolymers), as an alternative to cement. Hydraulic conductivity of the treated soil was measured using a tailer-made apparatus. Test result shows that the biopolymer content of 2% could lower the conductivity by over 1000 times, and the ratio of 1:1 between Xanthan and guar gums yielded the best performance in general. Application of composite biopolymer to the slope with weathered granitic soil was investigated using the finite element method simulation. Numerical result indicates that the treatment can eliminate the slope failure effectively under rainfall with a hundred-year return period.
© The Authors, published by EDP Sciences, 2023
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